CN101463441A - Rare earth-containing high strength heat resisting magnesium alloy and preparation thereof - Google Patents

Rare earth-containing high strength heat resisting magnesium alloy and preparation thereof Download PDF

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CN101463441A
CN101463441A CNA2009100454056A CN200910045405A CN101463441A CN 101463441 A CN101463441 A CN 101463441A CN A2009100454056 A CNA2009100454056 A CN A2009100454056A CN 200910045405 A CN200910045405 A CN 200910045405A CN 101463441 A CN101463441 A CN 101463441A
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alloy
add
magnesium
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melting
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王渠东
高岩
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Abstract

The invention relates to a high strength heat-resistant magnesium alloy containing rare earths of the technical field of metallic materials and a preparation method thereof. The magnesium alloy comprises the following components according to the mass percent: Y with more than or equal to 3% and less than or equal to 16%, Gd with more than or equal to 0% and less than or equal to 10%, Ca with more than or equal to 0.3% and less than or equal to 5%, Zr with more than or equal to 0.1% and less than or equal to 1.5%, and one or a plurality of Nd, Si, Sb, Ti, Sn, Sr, Bi, Cd, Nd with more than or equal to 0% and less than or equal to 5%, Si with more than or equal to 0% and less than or equal to 5%, Sb with more than or equal to 0% and less than or equal to 5%, Ti with more than or equal to 0% and less than or equal to 5%, Sn with more than or equal to 0% and less than or equal to 5%, Sr with more than or equal to 0% and less than or equal to 5%, Bi with more than or equal to 0% and less than or equal to 5%, Cd with with more than or equal to 0% and less than or equal to 5%, and the rest is Mg and impurities. The magnesium alloy is obtained by using melting and the subsequent heat treatment. The magnesium alloy not only can serve as casting magnesium alloy but also can serve as the deformation magnesium alloy and has better predominant mechanical property compared with the WE series commercial magnesium alloy.

Description

Rare earth-containing high strength heat resisting magnesium alloy and preparation method thereof
Technical field
The present invention relates to magnesium alloy of a kind of metallic substance technical field and preparation method thereof, be specifically related to a kind of rare earth-containing high strength heat resisting magnesium alloy and preparation method thereof.
Background technology
Magnesium alloy can satisfy the motor vehicle exhaust requirement of increasingly stringent as the lightest structural metallic materials, can produce in light weight, oil consumption is few, the new automobile of environment-friendly type, thereby in automotive industry, be subjected to paying close attention to widely.Yet low mechanical properties such as hot strength have restricted its application on engine and power system part.Therefore, high-strength heat-resisting magnesium alloy has been proposed.
Rare earth element is considered to be used for improving the important element of magnesium alloy resistance toheat, has for example obtained the Mg-Y-Nd base alloy WE54 and the WE43 of commercial applications.Traditional WE54 alloy is after T6 handles, and room temperature tensile strength is 250MPa, and yield strength is 172MPa, and unit elongation is 2.0% (ASM Specialty Handbook:Magnesium and Magnesium Alloys).
Find through retrieval prior art, in Chinese patent CN 1804083A, put down in writing a kind of high-strength heat-resistant rare earth magnesium alloy, it consists of: the Gd of 2~10% weight ratios, the Y of 3~12% weight ratios, the weight sum of Gd and Y accounts for 13~14% of this alloy gross weight, and the Zr of 0.4~0.7% weight ratio and the activating element (Zn that is not more than 0.3% weight ratio, Ag, Cu, Sr, Ca, Ti, Bi, choose any one kind of them among the Cd), or the Mn of 0.6~1.5% weight ratio and the activating element (Sn that is not more than 0.3% weight ratio, Si, Sb, Ca, choose any one kind of them among the Sr), all the other are magnesium.The precipitate of this magnesium-rare earth is always separated out along the prismatic plane of matrix, forms a kind of netted phase structure of intersection, has the alligatoring of energy high resistance particle, provides highly enriched and effect creep resistance.They are under 300 ℃ of application conditions, and instantaneous ultimate tensile strength is 180MPa.
Find also in the retrieval that put down in writing a kind of creep resistance Dow metal in Chinese patent CN101078080A, this magnesium alloy composition and weight percent thereof are: 1.5-10wt.%Y, 0.15-2.0wt.%Zr, 0.3-2.0wt.%Nd, 2.5-8wt.%Gd, and Sm, Dy, Tb, Ho, Er, among Tm and the Eu one or more, 0-1.5wt.%Sm wherein, 0-5wt.%Dy; 0-5wt.%Tb; 0-5wt.%Ho, 0-5wt.%Er, 0-5wt.%Tm, 0-5wt.%Eu, all the other are Mg.
Yet in the document, Ca content is not more than 0.3% in Chinese patent CN 1804083A, and does not add the Nd element.Its instantaneous ultimate tensile strength at 300 ℃ is not brought into play greatly, if Ca content surpasses 0.3%, and the suitable second phase strengthening effect that utilizes it, can obtain the alloy of 300 ℃ instantaneous ultimate tensile strength above 200MPa.In Chinese patent CN101078080A, though comprised Y, Gd and Nd alloying element, but do not comprise the Ca element and be higher than above Y of 10wt.% and the Nd that is higher than the above content of 2wt.%, and do not comprise elements such as Si, Sb, Ti, Sn, Sr, Bi, Cd.Therefore, these two patents all have limitation separately.
In sum, in the alloy among the more high-load Y of adding and Ca, Nd or Si, Sb, Ti, Sn, Sr, Bi, the Cd one or more, the effect of second reinforcement mutually, ageing strengthening and the alloying of alloy can be brought into play more, thereby higher high temperature tensile properties and creep-resistant property can be accessed.By further optimization heat treatment of alloy technology and heat processing technique, the acquisition excellent heat resisting has crucial meaning to the practical application of alloy.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of rare earth-containing high strength heat resisting magnesium alloy and preparation method thereof is proposed, by adding alloying element (Y, Gd, Ca, Nd, Si, Zr, Sb, Ti, Sn, Sr, Bi, Cd) and adjust corresponding thermal treatment process, thereby realize the room temperature and the hot strength of the excellence that heat resistance magnesium alloy need possess.
The present invention is achieved by the following technical solutions,
Rare earth-containing high strength heat resisting magnesium alloy involved in the present invention, each component and the weight percent thereof that comprise are: 3%≤Y≤16%, 0%≤Gd≤10%, 0.3%≤Ca≤5%, 0.1≤Zr≤1.5%, and among Nd, Si, Sb, Ti, Sn, Sr, Bi, the Cd one or more, 0%≤Nd≤5% wherein, 0%≤Si≤5%, 0%≤Sb≤5%, 0%≤Ti≤5%, 0%≤Sn≤5%, 0%≤Sr≤5%, 0%≤Bi≤5%, 0%≤Cd≤5%, all the other are Mg and unavoidable impurities.Wherein, impurity content is: Fe<0.005%, Cu<0.015%, Ni<0.002%.
The preparation technology of above-mentioned alloy provided by the present invention is divided into two stages, i.e. thermal treatment after melting and the melting.
Described melting is at SF 6And CO 2Mixed gas protected condition under carry out, comprise the steps:
1. melting Mg: in smelting furnace, add the pure magnesium of oven dry, melting;
2. add among Ca and Si, Sb, Ti, Sn, Sr, Bi, the Cd one or more: after treating that magnesium ingot melts fully, add down at 660~680 ℃;
3. add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 700~740 ℃;
4. add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 760~780 ℃, stir 2~5min and fully melt to impel it;
5. casting: rising magnesium liquid temp to 780~800 ℃, be cooled to 740~760 ℃ behind insulation 20~30min, energising refining 6~10min, time of repose after the refining is controlled between 25~40min, treat that skimming surface scum after magnesium liquid is cooled to 700~740 ℃ casts, casting is heated to 200~250 ℃ in advance with steel die, can obtain the magnesium-rare earth alloy ingot blank.
Thermal treatment after the described melting is: the magnesium-rare earth alloy ingot blank that melting is obtained carries out 490~540 ℃, carries out 200~300 ℃ again, the ageing treatment of 12~60h after the solution treatment of 6~30h or the solution treatment.
Among the present invention, because the rare earth element y solid solubility is big, solid solution strengthening effect is good, has the ageing strengthening ability, and in rare earth metal, has relatively low density, help to increase the fire-retardant and resistance of oxidation of alloy, thereby select for use Y, obtain good solution strengthening and timeliness precipitating reinforcing effect for guaranteeing alloy as first constituent element, the add-on of Y is not less than 3%, too many for avoiding cost of alloy and density to increase, and plasticity is low excessively, the add-on of Y should not be higher than 16%; Select for use Gd as second constituent element, the interaction of rare earth element y, Gd, fully promote the solid solution aging strengthening effect of Gd, be expected to obtain than the better mechanical behavior under high temperature of simple rare earth element y, and the adding that the improves Y detrimentally affect that causes the age hardening peak temperature to postpone, but excessive Gd can cause density to increase too much, and the plasticity of alloy reduces, cost increases, so the content of Gd is controlled at 0~10%; Select for use Ca as the 3rd constituent element, and its content is not more than 5% above 0.3%, because behind the addition element Ca, can fully promote the solid solution aging strengthening effect of rare earth element y, Gd, second phase of refinement simultaneously changes its pattern, makes its disperse more that distributes, thereby more effectively improve the high-temperature behavior of alloy, the adding of Ca can also reduce cost effectively certainly; Among adding Nd, Si, Sb, Ti, Sn, Sr, Bi, the Cd one or more help to form second phase, play the effect that solution strengthening and second is strengthened mutually.Certainly these several interpolation elements can also reduce cost effectively, but content is also too much unsuitable, so one or more the content among Nd, Si, Sb, Ti, Sn, Sr, Bi, the Cd is controlled at 0~5%; In addition, in alloy, add an amount of Zr and come crystal grain thinning, further improve the intensity and the plasticity of material, thereby expectation obtains comparatively excellent comprehensive performance.
In a word, compared with prior art, the present invention has marked improvement, the heat resistance magnesium alloy that provides is in light weight except that having, technology is simple, cost can accept, also has good plasticity, excellent hot strength and creep-resistant property.
The present invention can give full play to the comprehensive advantage of high rare earth alloy and high calcium-containing amount, obtain the high creep resisting magnesium alloy of high strength that 300 ℃ instantaneous ultimate tensile strength reaches as high as 262MPa, and the alloy in the scope of the invention all is higher than 190MPa at 300 ℃ instantaneous ultimate tensile strength.
Magnesium alloy of the present invention just can obtain by the method for conventional cast, handles the high creep resisting heat resistance magnesium alloy of the high strength that can obtain excellent properties by subsequent heat treatment technology.Be fit to large-scale industrial production, be particularly suitable under the situation of 300-350 ℃ of high temperature, using.
Embodiment
Below embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1:
Alloying constituent (weight percent): 3% Y, 2% Gd, 0.3% Ca, 2% Nd, 0.1% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 490 ℃, carries out 225 ℃ again after the solution treatment of 6h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-3Y-2Gd-0.3Ca-2Nd-0.1Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 178MPa and 5.1% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 225MPa and 11%, after T6 handled, room temperature tensile strength and unit elongation were respectively 259MPa and 3.1%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 211MPa, 202MPa and 194MPa.
Embodiment 2:
Alloying constituent (weight percent): 3% Y, 10% Gd, 1.3% Ca, 5% Nd, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 525 ℃, carries out 225 ℃ again after the solution treatment of 16h (being called for short T4) or T4 handle, the ageing treatment of 40h (being called for short T6).Can obtain having concurrently the Mg-3Y-10Gd-1.3Ca-5Nd-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 207MPa and 5.3% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 245MPa and 14%, after T6 handled, room temperature tensile strength and unit elongation were respectively 289MPa and 3.1%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 253MPa, 232MPa and 215MPa.
Embodiment 3:
Alloying constituent (weight percent): 4% Y, 4% Gd, 0.5% Ca, 0.5% Nd, 1.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 515 ℃, carries out 225 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-4Y-4Gd-0.5Ca-0.5Nd-1.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 192MPa and 2.1% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 235MPa and 9%, after T6 handled, room temperature tensile strength and unit elongation were respectively 289MPa and 2.9%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 215MPa, 203MPa and 197MPa.
Embodiment 4:
Alloying constituent (weight percent): 4% Y, 4% Gd, 1.0% Ca, 5% Sb, 0.5% Ti, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Sb, Ti: in magnesium liquid, add Mg-Y, Mg-Gd, Mg-Ti and Mg-Sb master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 515 ℃, carries out 225 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 35h (being called for short T6).Can obtain having concurrently the Mg-4Y-4Gd-1Ca-5Sb-0.5Ti-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 179MPa and 2.8% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 227MPa and 8%, after T6 handled, room temperature tensile strength and unit elongation were respectively 267MPa and 3.9%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 220MPa, 215MPa and 196MPa.
Embodiment 5:
Alloying constituent (weight percent): 4% Y, 4% Gd, 1% Ca, 0.5% Nd, 0.5% Si, 0.5% Ti, 0.5% Sb, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Si, Sb, Nd: in magnesium liquid, add Mg-Y, Mg-Gd, Mg-Sb, Mg-Si and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 225 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-4Y-4Gd-1Ca-0.5Nd-0.5Si-0.5Ti-0.5Sb-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 192MPa and 2.1% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 242MPa and 9%, after T6 handled, room temperature tensile strength and unit elongation were respectively 281MPa and 3.2%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 219MPa, 211MPa and 191MPa.
Embodiment 6:
Alloying constituent (weight percent): 5% Y, 4% Gd, 2.0% Ca, 5% Sn, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Sn: in magnesium liquid, add Mg-Y, Mg-Gd, Mg-Sn master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 225 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-5Y-4Gd-2Ca-5Sn-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 199MPa and 2.7% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 258MPa and 6%, after T6 handled, room temperature tensile strength and unit elongation were respectively 277MPa and 3.1%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 221MPa, 207MPa and 199MPa.
Embodiment 7:
Alloying constituent (weight percent): 8% Y, 4% Gd, 2% Ca, 2% Nd, 0.5% Sn, 0.5% Bi, 0.5% Sr, 0.5% Cd, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Sn, Bi, Sr, Cd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd, Mg-Sn, Mg-Sr, Mg-Cd, Mg-Bi and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 250 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-8Y-4Gd-2Ca-2Nd-0.5Sn-0.5Bi-0.5Sr-0.5Cd-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 222MPa and 2.1% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 242MPa and 9%, after T6 handled, room temperature tensile strength and unit elongation were respectively 311MPa and 2.9%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 279MPa, 261MPa and 251MPa.
Embodiment 8:
Alloying constituent (weight percent): 8% Y, 4% Gd, 5% Ti, 0.4% Ca, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Ti: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Ti master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 250 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 30h (being called for short T6).Can obtain having concurrently the Mg-8Y-4Gd-5Ti-0.4Ca-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its room temperature tensile strength and unit elongation are respectively 223MPa and 3.1% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 265MPa and 12%, after T6 handled, room temperature tensile strength and unit elongation were respectively 309MPa and 4.9%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 285MPa, 273MPa and 261MPa.
Embodiment 9:
Alloying constituent (weight percent): 10% Y, 5% Ca, 5% Sr, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Sr: in magnesium liquid, add Mg-Y and Mg-Sr master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 235 ℃ again after the solution treatment of 20h (being called for short T4) or T4 handle, the ageing treatment of 48h (being called for short T6).Can obtain having concurrently the Mg-10Y-5Ca-5Sr-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its tensile strength and unit elongation are respectively 222MPa and 2.9% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 273MPa and 8.1%, after T6 handled, room temperature tensile strength and unit elongation were respectively 302MPa and 4.7%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 276.3MPa, 260.5MPa and 222.3MPa.
Embodiment 10:
Alloying constituent (weight percent): 10% Y, 3% Gd, 1.5% Ca, 1.5% Sr, 1.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Sr: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Sr master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 225 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-10Y-3Gd-1.5Ca-1.5Sr-1.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its tensile strength and unit elongation are respectively 242MPa and 2.5% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 263MPa and 9.1%, after T6 handled, room temperature tensile strength and unit elongation were respectively 312MPa and 3.7%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 277.8MPa, 259.1MPa and 234.8MPa.
Embodiment 11:
Alloying constituent (weight percent): 10% Y, 3% Gd, 5% Nd, 0.8% Ca, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 225 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-10Y-3Gd-5Nd-0.8Ca-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its tensile strength and unit elongation are respectively 267MPa and 2.8% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 273MPa and 10.1%, after T6 handled, room temperature tensile strength and unit elongation were respectively 329MPa and 3.1%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 257MPa, 246MPa and 221MPa.
Embodiment 12:
Alloying constituent (weight percent): 10% Y, 3% Gd, 2.5% Nd, 1% Si, 0.8 Ca, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd, Si and Nd: in magnesium liquid, add Mg-Y, Mg-Gd, Mg-Nd and Mg-Si master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 530 ℃, carries out 225 ℃ again after the solution treatment of 16h (being called for short T4) or T4 handle, the ageing treatment of 24h (being called for short T6).Can obtain having concurrently the Mg-10Y-3Gd-2.5Nd-1Si-0.8Ca-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its tensile strength and unit elongation are respectively 281MPa and 2.5% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 279MPa and 9.7%, after T6 handled, room temperature tensile strength and unit elongation were respectively 312MPa and 3.8%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 264MPa, 233MPa and 218MPa.
Embodiment 13:
Alloying constituent (weight percent): 12% Y, 1% Gd, 1% Ca, 4% Nd, 0.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 540 ℃, carries out 300 ℃ again after the solution treatment of 10h (being called for short T4) or T4 handle, the ageing treatment of 16h (being called for short T6).Can obtain having concurrently the Mg-12Y-1Gd-1Ca-4Nd-0.5Zr alloy of high strength and good resistance creep property at last.
The alloy of present embodiment, its tensile strength and unit elongation are respectively 302MPa and 2.3% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 305MPa and 9.1%, after T6 handled, room temperature tensile strength and unit elongation were respectively 346MPa and 2.1%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 281MPa, 280MPa and 256MPa.
Embodiment 14:
Alloying constituent (weight percent): 16% Y, 6% Gd, 3% Nd, 5% Ca, 1.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 540 ℃, carries out 250 ℃ again after the solution treatment of 30h (being called for short T4) or T4 handle, the ageing treatment of 60h (being called for short T6).Can obtain having concurrently the heat-resisting Mg-16Y-6Gd-3Nd-5Ca-1.5Zr alloy of high strength and good plasticity at last.
The alloy of present embodiment, its tensile strength and unit elongation are respectively 280MPa and 1.9% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 299MPa and 8.6%, after T6 handled, room temperature tensile strength and unit elongation were respectively 337MPa and 1.5%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 299MPa, 291MPa and 262MPa.
Embodiment 15:
Alloying constituent (weight percent): 16% Y, 3% Nd, 0.5% Ca, 1.5% Zr, impurity element are less than 0.02%, and all the other are Mg.
The melting technology concrete steps of this alloy are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt SF simultaneously 6And CO 2Mixed gas protect; (2) add Ca: after treating that magnesium ingot melts fully, add technical pure calcium down at 660 ℃; (3) add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 740 ℃; (4) add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 780 ℃, stir 5min and fully melt to impel it; (5) casting: rising magnesium liquid temp to 800 ℃, be cooled to 760 ℃ behind the insulation 30min, energising refining 10min, the time of repose after the refining is controlled at 40min, treat that skimming surface scum after magnesium liquid is cooled to 740 ℃ casts, casting is heated to 250 ℃ in advance with steel die.
The alloy that melting is obtained carries out 540 ℃, carries out 250 ℃ again after the solution treatment of 30h (being called for short T4) or T4 handle, the ageing treatment of 48h (being called for short T6).Can obtain having concurrently the heat-resisting Mg-16Y-3Nd-0.5Ca-1.5Zr alloy of high strength and good plasticity at last.
The alloy of present embodiment, its tensile strength and unit elongation are respectively 292MPa and 1.7% under the as cast condition, and after T4 handled, room temperature tensile strength and unit elongation were respectively 289MPa and 7.2%, after T6 handled, room temperature tensile strength and unit elongation were respectively 357MPa and 1.9%.
The alloy of present embodiment, after T6 handled, the tensile strength during 200 ℃, 250 ℃ and 300 ℃ tests of high temperature was still up to 292MPa, 288MPa and 272MPa.

Claims (5)

1. a rare earth-containing high strength heat resisting magnesium alloy is characterized in that, each component and weight percent thereof are: 3%≤Y≤16%, 0%≤Gd≤10%, 0.3%≤Ca≤5%, 0.1≤Zr≤1.5%, and among Nd, Si, Sb, Ti, Sn, Sr, Bi, the Cd one or more, 0%≤Nd≤5%, 0%≤Si≤5%, 0%≤Sb≤5% wherein, 0%≤Ti≤5%, 0%≤Sn≤5%, 0%≤Sr≤5%, 0%≤Bi≤5%, 0%≤Cd≤5%, all the other are Mg and impurity.
2. rare earth-containing high strength heat resisting magnesium alloy according to claim 1 is characterized in that, described impurity, and its composition weight percent is: Fe<0.005%, Cu<0.015%, Ni<0.002%.
3. the preparation method of a rare earth-containing high strength heat resisting magnesium alloy as claimed in claim 1 is characterized in that comprising: the thermal treatment after melting and the melting, described melting is at SF 6And CO 2Mixed gas protected condition under carry out, comprise the steps:
1. melting Mg: in smelting furnace, add the pure magnesium of oven dry, melting;
2. add among Ca and Si, Sb, Ti, Sn, Sr, Bi, the Cd one or more: after treating that magnesium ingot melts fully, add down at 660~680 ℃;
3. add Y, Gd and Nd: in magnesium liquid, add Mg-Y, Mg-Gd and Mg-Nd master alloy at 700~740 ℃;
4. add Zr: add the Mg-Zr master alloy after the magnesium liquid temp is risen to 760~780 ℃, stirring is fully melted it;
5. casting: rising magnesium liquid temp to 780~800 ℃, be cooled to 740~760 ℃ behind insulation 20~30min, energising refining 6~10min, time of repose after the refining is controlled between 25~40min, treat that skimming surface scum after magnesium liquid is cooled to 700~740 ℃ casts, casting is heated to 200~250 ℃ in advance with steel die, obtains the magnesium-rare earth alloy ingot blank;
Thermal treatment after the described melting is: the magnesium-rare earth alloy ingot blank that melting is obtained carries out 490~540 ℃, the solution treatment of 6~30h.
4. according to the preparation method of the rare earth-containing high strength heat resisting magnesium alloy of claim 3, it is characterized in that, described 4. in, churning time is 2~5min.
5. according to the preparation method of the rare earth-containing high strength heat resisting magnesium alloy of claim 3, it is characterized in that, carry out 200~300 ℃ again, the ageing treatment of 12~60h after the described solution treatment.
CNA2009100454056A 2009-01-15 2009-01-15 Rare earth-containing high strength heat resisting magnesium alloy and preparation thereof Pending CN101463441A (en)

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CN109161753A (en) * 2018-10-20 2019-01-08 广州宇智科技有限公司 A kind of antiflaming magnesium alloy of coupled surface liquid metal and matrix high heat-transfer performance
CN109182810A (en) * 2018-11-19 2019-01-11 河北工业大学 A kind of low cost high-temperature-room type plasticity wrought magnesium alloy and preparation method thereof
CN109266929A (en) * 2018-11-19 2019-01-25 河北工业大学 A kind of tough micro- rare earth wrought magnesium alloy of high strength and low cost and preparation method thereof
CN109252080A (en) * 2018-11-19 2019-01-22 浙江海洋大学 A kind of high temperature resistant rare earth-magnesium alloy material and preparation method thereof
CN109252080B (en) * 2018-11-19 2021-02-02 浙江海洋大学 High-temperature-resistant rare earth-magnesium alloy material and preparation method thereof
CN109182809A (en) * 2018-11-19 2019-01-11 河北工业大学 A kind of tough wrought magnesium alloy of high strength and low cost and preparation method thereof
CN109182809B (en) * 2018-11-19 2020-07-28 河北工业大学 Low-cost high-toughness wrought magnesium alloy and preparation method thereof
CN109182810B (en) * 2018-11-19 2021-03-02 河北工业大学 Low-cost high-room-temperature plastic deformation magnesium alloy and preparation method thereof
TWI685572B (en) * 2018-12-04 2020-02-21 國立中興大學 Melting of pure silicon in liquid magnesium and a fabricating method of magnesium-based thermoelectric materials
CN110241346A (en) * 2019-07-04 2019-09-17 中国科学院金属研究所 A kind of high-strength high rigidity cast magnesium alloy and preparation method thereof
CN112251657A (en) * 2020-09-13 2021-01-22 北京工业大学 Preparation method for improving plastic forming of rare earth magnesium alloy
CN112143952A (en) * 2020-09-28 2020-12-29 贵州航天风华精密设备有限公司 High-strength heat-resistant magnesium alloy and smelting and heat treatment method thereof

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