CN104046868B - Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof - Google Patents

Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof Download PDF

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CN104046868B
CN104046868B CN201410299662.3A CN201410299662A CN104046868B CN 104046868 B CN104046868 B CN 104046868B CN 201410299662 A CN201410299662 A CN 201410299662A CN 104046868 B CN104046868 B CN 104046868B
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magnesium alloy
alloy
heat conductive
rare earth
deformation
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CN104046868A (en
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徐世伟
唐伟能
秦云
蒋浩民
张丕军
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention relates to a rare-earth-free low-cost high-strength heat-conducting magnesium alloy and a preparation method thereof. The magnesium alloy is composed of the following chemical components in percentage by weight: 0.5-2.0 wt% of Mn, 0.3-1.5 wt% of Ca, 0.3-1.0 wt% of Al, and the balance of Mg and inevitable impurities. The magnesium alloy solves the problem of overhigh cost due to use of multiple rare-earth elements or high-price alloy elements, and the problems of sharp drop of heat conductivity coefficient, overhigh density and the like due to higher alloy element content caused by strength increase in the existing heat-conducting magnesium alloy; and the magnesium alloy has the advantages of higher heat conductivity coefficient, higher strength, higher flame resistance, lower cost and lower density.

Description

One kind no rare earth low-cost high-strength heat conductive magnesium alloy and preparation method thereof
Technical field
The present invention relates to metal material and metal material processing field, lead particularly to one kind no rare earth low-cost high-strength Hot magnesium alloy and preparation method thereof.
Background technology
Magnesium is the lightest one kind in common metal structural material, and proportion is about 1.74g/cm3, it is the 1/4 of steel, the 2/3 of aluminium. Magnesium and magnesium alloy have aboundresources, energy saving, eco-friendly three advantages, and are the very high light structures of specific strength Material and functional material, are by universally acknowledged " 21st century the most promising new material ".
Thermal conductivity under pure magnesium room temperature is higher, about 157w/m*k, but intensity is too low, and the tensile yield strength under as cast condition is about For 21mpa.After alloying, its intensity significantly improves magnesium, but thermal conductivity factor generally substantially reduces, such as existing commercial alloy Mg-3al-1zn (az31) alloy thermal conductivity factor be 78w/m*k, mg-9al-1zn (az91) alloy thermal conductivity factor be 55w/m* K, mg-6al-0.5mn (am60) alloy thermal conductivity factor is 61w/m*k (magnesium, magnesium alloys, and Magnesium composites, by manoj gupta and nai mui ling, sharon), their thermal conductivity factor is all Thermal conductivity factor far below pure magnesium.Magnesium alloy radiator is substantially the business magnesium alloy relatively low using above-mentioned thermal conductivity at present, The radiating effect of magnesium alloy is also far from giving full play of.
China's electronic technology develops rapidly in recent years, the high-performance of electronic industry, miniaturization, integrated development trend, makes Obtain the overall power density of electronic device and caloric value significantly increases, heat dissipation problem is more and more prominent, especially loss of weight is required The complex structural member of sensitive Aero-Space device, portable electricity consuming productses and the product cooling system such as communication apparatus, vehicles, should Seek excellent heat conductivility, should also have that density is little, the feature of excellent in mechanical performance, low production cost simultaneously, therefore take into account and lead The lightweight heat conductive magnesium alloy material of hot, mechanical property and production and processing performance has irreplaceable effect and important application Background.But both at home and abroad alloying element is to the report of the affecting laws of its heat conductivility and its mechanism aspect very in the magnesium alloy at present Few, it is badly in need of carrying out the composition design of heat conductive magnesium alloy, Development of Novel high heat conduction magnesium alloy and its related technology of preparing.
Abroad disclose and report some of a relatively high alloys of thermal conductivity factor, such as ez33 (100w/m*k, mg-re-zn), Qe22 (113w/m*k, mg-ag-re), ze41 (123w/m*k, mg-zn-re) etc., but their intensity is all relatively low.
In recent years, domestic gradually have some higher intensity heat conductive magnesium alloys to be developed successively, and such as Chinese patent is open 2.5~11%zn, 0.15~1.5%zr, 0.1~2.5%ag, 0.3 is contained in number alloying component disclosed in cn100513606c ~3.5%ce, 0~1.5%nd, 0~2.5%la, pr0~0.5%;20 DEG C of thermal conductivitys are more than 120w/m*k, and tensile strength is big It is more than 310mpa in 340mpa, yield strength.But all contain in these heat conductive magnesium alloys substantial amounts of rare earth element such as nd, la, pr, Ce etc., or alloying element ag, zr etc., cost of alloy is high, and density of material is bigger than normal.
China Patent Publication No. cn101709418 proposes another kind of conducting alloy, and its chemical composition is 1~6.5%zn, 0.2~2.5%si;20 DEG C of thermal conductivitys be more than 120w/m*k, tensile strength be 265~380mpa, yield strength be 210~ 355mpa.When main alloying element zn content is relatively low, mechanical property relatively low (tensile strength < 340mpa, yield strength < 310mpa); And gold element zn that overlaps (~6.5%) content higher when, density of material larger (> 1.8g/cm3).And according to report due to existing Low melting point mg-zn phase, hot-working character is general;The ignition point relatively low (600 DEG C about) of alloy, flame resistance are poor.Therefore, in order to Preferably meet consumer electronics, automobile and other industries for the low cost of heat conductive magnesium alloy, low-density, high performance demand, compel It is essential to ask and develop that cost is lower, density is less, intensity is higher, heat conductivility is more preferable, the novel magnesium alloy radiator structure of resistance to combustion Material.
Content of the invention
Lead to high cost for what existing heat conductive magnesium alloy existed using multiple rare earth elements or high-priced alloying element, or It is in order to increase intensity and to improve alloying element content, lead to thermal conductivity factor drastically to decline, the problems such as alloy density is higher, this Bright purpose is to provide one kind no rare earth low-cost high-strength heat conductive magnesium alloy and preparation method thereof, this magnesium alloy heat conduction Coefficient, intensity and flame resistance are all higher, and relative inexpensiveness, density are relatively small.
For reaching above-mentioned purpose, the technical scheme is that
One kind no rare earth low-cost high-strength heat conductive magnesium alloy, its chemical component weight percentage is: mn0.5~ 2.0wt%, ca0.3~1.5wt%, al0.3~1.0wt%, remaining is mg and inevitable impurity.
Currently used for radiator metal material mostly based on aluminium alloy or copper alloy.Research finds, alloy thermal conductivity Can there are close ties with the value volume and range of product of the solid solution atom in this alloy and the second phase.The heat conductivility of magnesium alloy is also in compliance with class Like principle.Design novel heat-conducting alloy, lifting magnesium alloy thermal conductivity it should in suitable control magnesium alloy solid solution atom quantity, Ensure simultaneously its precipitated phase size can not too big, quantity can not be too many.
In magnesium alloy, conventional alloy element includes al, zn, mn, ca, re etc..Research summary obtains, high-strength magnesium alloy Design principle be: the atomic radius of main alloy element one is bigger than magnesium atom, simultaneously this major alloy unit less than magnesium Between element, the negative value of enthalpy of mixing is more big more is likely to form combination between stable atom, is conducive in deformation process as aluminium alloy one Sample forms regular g.p area, nano level precipitate and the stable high-melting-point precipitate of monatomic or polyatom floor, so that This alloy has higher intensity and resistance to elevated temperatures.According to above-mentioned theory, the present invention is by conventional alloying unit in magnesium Element is calculated, and finds there is good matching relationship between magnesium, aluminium, calcium, manganese element.In mg-al-ca-mn quaternary alloy, ca The atomic radius of atom is more than mg atom, and the atomic radius of al and mn atom is less than mg atom, ca-al and al-mn is former simultaneously The negative value of the enthalpy of mixing between son is than larger.
According to features in magnesium for each element, optimization design can be gone out this from the viewpoint of materialogy alloy strengthening mechanism The species of alloy element and addition in scheme, relend the phasor helping magnesium alloy the performance characteristic according to actual casting alloy Verified.
Al is the most frequently used alloying element of magnesium alloy, and its density is less.Aluminium can form limit solid solution with magnesium, closes improving Casting character can be improved it is also possible to ageing strengthening is produced by heat treatment while golden intensity and hardness.According to document, magnalium closes The thermal conductivity of gold increases with solid solution atomic quantity and reduces it is therefore desirable to control the content of aluminium element to keep good heat Lead performance.Ca is the less metallic element of proportion, and element can occur effective Grain Refinement Effect in magnesium, can suppress molten magnesium Oxidation, improve the ignition temperature of alloy melt and flame resistance, and the croop property of alloy can be improved.According to document report, Calculate mg-al-ca ternary phase diagrams by thermodynamic software to obtain: change al/ca ratio when alloy in it is possible that three kinds The second different phases, its second phase amount gradually increases with the increase of element addition.Particularly, can get in the alloy Orderly individual layer gp area, this nanostructured is to the strengthening effect of alloy clearly.Therefore, in order to control present in alloy The amount of the second phase and type, and maintain alloy low-density feature, low alloying should be adopted;However, to ensure that strengthening effect is to obtain Obtain compared with high alloy intensity it is necessary to there are the second phase particles of q.s, the content of therefore al, ca of design alloy is more than 0.3%, But all less than 1.5%, al, ca content scope of design of the present invention is respectively as follows: al=0.3~1.0wt%, ca=0.3~ 1.5wt%.
Mn to control iron content to precipitate fe-mn compound, improves corrosion behavior by controlling iron content;Meanwhile, mn Manganese element can increase heat resistance, crystal grain thinning, reinforced alloys in magnesium.As shown below, mg-6al-3ca alloy adds After the mn element of 0.1-0.5%, its creep resistance dramatically increases, and heat resistance improves.But solid solubility in magnesium for the manganese is less, content It is usually no more than 1.0wt%.In the environment of can forming the second phase, such as there is al element, the appropriate content increasing manganese, may Produce a certain amount of almn hardening constituent while solid solution part manganese element in the base, be conducive to improving alloy mechanical property further Energy.The content that the present invention designs mn is 0.5~2wt%.
The mg-al-ca-mn system alloy second of present invention design is mutually mainly mg2Ca, al2Ca, al8mn5Precipitate, it melts Higher (the mg of point2ca、al2ca、al8mn5It is respectively 714 DEG C, 1079 DEG C, 1160 DEG C), there is preferable heat endurance and strengthening effect Really, heat resistance and the higher force performance level of alloy are advantageously ensured that.
The preparation method of the no rare earth low-cost high-strength heat conductive magnesium alloy of the present invention, is characterized in that, comprise the following steps:
1) with simple metal or intermediate alloy as raw material, carry out dispensing by above-mentioned magnesium alloy composition;
2) simple metal and intermediate alloy are put into fusing in the crucible of smelting furnace, be prepared into alloy cast ingot;
3) no rare earth heat conductive magnesium alloy ingot casting is cut into respective blanks;
4) blank heating is carried out deformation process to predetermined deformation temperature, deformation temperature range is 300~500 DEG C, become Shape blank should be heated to required deformation temperature within 10 minutes;This deformation process is using in rolling, extruding or forging technology More than one, obtain required no rare earth low-cost high-strength heat conductive magnesium alloy material.
Further, step 2) in pure magnesium and mg-mn intermediate alloy be completely melt it is in co2And sf6Hybrid protection gas shielded Under carry out, co2And sf6Flow-rate ratio be 40~100, after fusing, the temperature control of solution is at 710~760 DEG C;Al ingot is in preheating furnace In be heated to 250~310 DEG C, the al ingot after preheating, ca particle or mg-ca intermediate alloy are successively added in magnesium melt, plus ca When need Argon gas agitating, then be incubated 5~10 minutes;Using die cast or semi-continuous casting.
Further, step 3) in, before non-rare earth heat conductive magnesium alloy ingot casting cuts into respective blanks, by alloy cast ingot in argon It is heated to 490~515 DEG C under the protection that atmosphere is enclosed and carry out the Homogenization Treatments of 0.1~48 hour.
Also, step 4) in deformation process blank deformation is processed into by sheet material using rolling mill practice, using extrusion process by base Material deformation processing becomes tubing, bar or section bar, using forging technology, blank deformation is processed various forging;Can also adopt above-mentioned Kinds of processes carries out composite deformation.
Preferably, step 4) in deformation process adopt rolling mill practice, rolling deformation speed be 10~40m/min, single pass Drafts is 30%~50%, accumulative deflection >=90% of sheet material;
Preferably, the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 2, its feature Be, step 4) in deformation process adopt extrusion process, crimp speed be 0.2~30m/min, extrusion ratio be 10~50.
Preferably, step 4) in deformation process adopt forging technology, forging deformation speed be 0.1~30m/min, single pass Drafts is 30%~50%, accumulative deflection >=60%.
Alloy material passes through crystal grain refinement, can obtain more excellent mechanical property, can not only improve its working plasticity, and Its intensity etc. can be improved.Magnesium alloy has the k-factor of bigger hall-petch relation relative to other alloy such as iron, aluminium, and it is brilliant Grain refinement becomes apparent to the contribution of the strength enhancing of alloy.In order to obtain more tiny crystal grain, to improve further The intensity of magnesium alloy and toughness and other advantageous property, typically adopt thermal deformation to process crystal grain thinning.Extruding, rolling, In the process of deformation such as forging, thick second phase that casting is formed gradually obtains broken refinement and Dispersed precipitate is in magnesium-based In body, the mechanical property of alloy is made to improve further.Plastic deformation as rolling, extruding or forging etc. can significantly improve magnesium and The intensity of magnesium alloy and ductility, the squeeze wood of for example conventional commercial wrought magnesium alloy mg-al-zn system alloy has relative to as cast condition There is substantially more preferable comprehensive mechanical property.The high heat conduction magnesium alloy of Chinese patent cn100513606c and cn101709418 passes through Mechanical property after the deformation such as extruding is all significantly improved.
, in fusion process, melt temperature is stable for alloy of the present invention, and when melt temperature is to 650 DEG C, still had is resistance to Fire.After alloy deformation, room temperature (25 DEG C) tensile strength is more than 340mpa, and tensile yield strength is more than 330mpa.
This magnesium alloy does not contain any rare earth element and high-priced alloying element, is all higher than 125w/ (m* in 20 DEG C of thermal conductivity factors K), density is less than 1.8g/cm3.Can be used for Aero-Space, computer, communication and consumer electronics product and led illuminating product Cooling system structure material.
Heat conductive magnesium alloy product of the present invention contrasts existing heat conductive magnesium alloy a following remarkable advantage:
1. cost of alloy is low: the no rare earth low-cost high-strength heat conductive magnesium alloy of present invention preparation is by Conventional alloys element Al, ca, mn form, without more expensive rare earth element and other high valence elements.
2. alloy melt is stable, and ignition point significantly improves (higher than 650 DEG C).
3. alloy density is low: in the range of composition design, the alloy density of all designs is less than 1.80g/cm3.
4. thermal conductivity factor is high: the no rare earth low-cost high-strength heat conductive magnesium alloy of present invention preparation is in 20 DEG C of thermal conductivity factor More than 125w/ (m*k), it is still good that temperature rises high alloy heat conductivility.
5. high mechanical properties: room temperature (25 DEG C) tensile strength is more than 340mpa, tensile yield strength is more than 330mpa.
6. excellent combination property: compared with existing magnesium alloy, its thermal conductivity factor and intensity are all higher, but cost is relatively Low, alloy density is relatively small, dissipating in Aero-Space, computer, communication and consumer electronics product and led illuminating product Hot systems structural material aspect has broad prospect of application.
Brief description
Fig. 1 is the material conducts heat after hot extrusion for the mg-mn-ca-al alloy of different element proportionings in the embodiment of the present invention Coefficient varies with temperature curve;
Fig. 2 is the room temperature tensile power of mg-mn-ca-al alloy material after hot extrusion of different element proportionings in embodiment Learn curve.
Specific embodiment
Below by embodiment and accompanying drawing, technical scheme is elaborated, the present embodiment is in the technology of the present invention Implemented under premised on scheme, given detailed embodiment and specific operating process, but protection scope of the present invention It is not limited to following embodiments.
Choose three kinds of alloying components mg-1.5mn-1.0al-1.0ca (wt%) (alloy 1), mg-1.5mn-1.0al- 0.5ca (wt%) (alloy 2), mg-1.5mn-0.5al-1.0ca (wt%) (alloy 3) are as exemplary.
According to technical solution of the present invention, with simple metal or intermediate alloy as alloyed feedstock, smelting make inexpensive magnesium Alloy cast ingot;Ca element adds the oxidation of suppression molten magnesium, improves the ignition temperature (higher than 650 DEG C) of alloy melt, alloy exists In smelting process, degree of oxidation substantially reduces.Extrusion billet is put into and in induction heater, is heated rapidly to 350 DEG C of extrusion temperature, Then directly blank deformation is processed into by bar using extrusion process, extrusion speed is 5m/min, extrusion ratio is 25, rod after extruding Material adopts air-cooled.And extruded barses are tested, result shows:
Alloy 1 after hot extrusion, thermal conductivity factor in 20,100,200 and 270 DEG C of condition and ranges is respectively 129.4, 131.3rd, 133.5 and 135.1w/ (m*k) (as shown in Figure 1);Room temperature (25 DEG C) tensile strength is 371mpa, tensile yield strength For 356mpa, elongation percentage about 6% (as shown in Figure 2);Density about 1.78g/cm3.
Alloy 2 after hot extrusion, thermal conductivity factor in 20,100,200 and 270 DEG C of condition and ranges is respectively 137.2, 137.8th, 138 and 138.2w/ (m*k) (as shown in Figure 1);Room temperature (25 DEG C) tensile strength is 360mpa, and tensile yield strength is 350mpa, elongation percentage is about 6% (as shown in Figure 2);Density about 1.78g/cm3.
Alloy 3 after hot extrusion, thermal conductivity factor in 20,100,200 and 270 DEG C of condition and ranges is respectively 125.3, 126.1st, 126.8 and 127.1w/ (m*k) (as shown in Figure 1);Room temperature (25 DEG C) tensile strength is 352mpa, tensile yield strength For 346mpa, elongation percentage about 6% (as shown in Figure 2);Density about 1.78g/cm3.
Other embodiments of the invention are referring to table 1.
Embodiment 1
Design is chosen mg-1.5mn-0.5al-1.0ca (wt%) alloying component proportioning and is become magnesium alloy, and its no rare earth is inexpensive The preparation method of high intensity heat conductive magnesium alloy is as follows:
1) with pure mg ingot, pure al ingot, pure ca particle and the mg-5mn intermediate alloy (component content that i.e. this intermediate alloy is For: 5wt%mn, remaining is mg) raw material, carry out dispensing by the percentage by weight of above-mentioned magnesium alloy composition;
2) after crucible being cleared up and preheated, whole pure magnesium ingots and mg-5mn intermediate alloy are put in the crucible of smelting furnace, co2And sf6The protection of hybrid protection gas under heat temperature raising, heating rate be 20~40 DEG C/min, co2And sf6Flow-rate ratio be 50, the temperature control being completely melt rear liquation is at 710~760 DEG C;
3) pure al ingot is placed in preheating furnace and is heated to 250~310 DEG C, the al ingot after preheating and ca particle are successively added In Serum Magnesium, plus during ca, need Argon gas agitating, be incubated 8 minutes after then machine stirs 3 minutes, so that all alloying elements is uniformly divided Cloth, in magnesium solution, is finally prepared into non-rare earth heat conductive magnesium alloy ingot casting using die cast;
4) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding extrusion billet, then preheats at 350 DEG C Directly blank deformation is processed into by bar using extrusion process afterwards, extrusion speed is 5m/min, extrusion ratio is 25, bar after extruding Using air-cooled cooling, that is, obtain no rare earth low-cost high-strength heat conductive magnesium alloy.
This heat conductive magnesium alloy material is 125w/ (m*k) in 20 DEG C of thermal conductivity factor, and room temperature (25 DEG C) tensile strength is 352mpa, tensile yield strength is 346mpa, and elongation percentage is 6%.
Embodiment 2
Design is chosen mg-0.8mn-0.5al-0.5ca (wt%) chemical composition proportioning and is become magnesium alloy, and its no rare earth is inexpensive The preparation method of high intensity heat conductive magnesium alloy material is as follows:
1) with pure mg ingot, pure al ingot, mg-30ca and mg-5mn intermediate alloy as raw material, by above-mentioned magnesium alloy composition Percentage by weight carry out dispensing;
2) after crucible being cleared up and preheated, whole pure magnesium ingots and mg-5mn intermediate alloy are put in the crucible of smelting furnace, co2And sf6The protection of hybrid protection gas under heat temperature raising, heating rate be 20~40 DEG C/min, co2And sf6Flow-rate ratio be 50, the temperature control being completely melt rear liquation is at 710~760 DEG C;
3) pure al ingot is placed in preheating furnace and is heated to 250~310 DEG C, by the al ingot after preheating and mg-ca intermediate alloy Successively add in Serum Magnesium, plus during ca, need Argon gas agitating, be incubated 10 minutes after then machine stirs 3 minutes, make all alloys Element is evenly distributed in magnesium solution, is finally prepared into non-rare earth heat conductive magnesium alloy ingot casting using die cast;
4) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding rolling blank, then preheats at 430 DEG C, With the speed of rolls as 20m/min, single pass rolling reduction is 30~50%, and accumulative deflection 90% is rolled into sheet material, obtains no rare earth Low-cost high-strength heat conductive magnesium alloy.
This heat conductive magnesium alloy material is 126w/ (m*k) in 20 DEG C of thermal conductivity factor, and room temperature (25 DEG C) tensile strength is 360mpa, tensile yield strength is 352mpa, and elongation percentage is 10%.(as subordinate list)
Embodiment 3
Design is chosen mg-1.5mn-0.9al-1.0ca (wt%) alloying component proportioning and is become heat conductive magnesium alloy, its extrudate Preparation method is as follows:
1) become ingot casting according to embodiment 1 methods described proportioning alloy raw material with smelting and pouring;
2) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding extrusion billet, then preheats at 350 DEG C Directly blank deformation is processed into by section bar using extrusion process afterwards, extrusion speed is 3m/min, extrusion ratio is 25, and squeeze wood adopts Air-cooled cooling, that is, obtain no rare earth low-cost high-strength heat conductive magnesium alloy.
Prepared no rare earth low-cost high-strength heat conductive magnesium alloy is 129w/ (m*k) in 20 DEG C of thermal conductivity factor, room temperature (25 DEG C) tensile strength is 370mpa, and tensile yield strength is 355mpa, and elongation percentage is 7%.
Embodiment 4
Design is chosen mg-1.0mn-0.3al-1.5ca (wt%) alloying component proportioning and is become magnesium alloy, and its no rare earth is inexpensive The preparation method of high intensity heat conductive magnesium alloy is as follows:
1) become semicontinuous ingot casting with smelting and pouring according to embodiment 1 methods described proportioning alloy raw material;
2) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding roughly shaped material, then pre- at 420 DEG C After heat, blank deformation is processed into by forging using forging technology, forging deformation speed is 0.5m/min, single pass rolling reduction is 30%~50%, accumulative deflection 90%, obtain no rare earth low-cost high-strength heat conductive magnesium alloy forging.
Forging parts material is 130w/ (m*k) in 20 DEG C of thermal conductivity factor, and room temperature (25 DEG C) tensile strength is 359mpa, Tensile yield strength is 350mpa, and elongation percentage is 8%.
Embodiment 5
Design is chosen mg-2.0mn-0.5al-0.3ca (wt%) chemical composition proportioning and is become magnesium alloy, and its no rare earth is inexpensive The preparation method of high intensity heat conductive magnesium alloy material is as follows:
1) become ingot casting according to embodiment 2 methods described proportioning alloy raw material with smelting and pouring;
2) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding rolling blank, then preheats at 420 DEG C, With the speed of rolls as 20m/min, single pass rolling reduction is 30~50%, and accumulative deflection 90% is rolled into sheet material, obtains no rare earth Low-cost high-strength heat conductive magnesium alloy.
Along rolling to test, material is 128w/ (m*k) in 20 DEG C of thermal conductivity factor, and room temperature (25 DEG C) tensile strength is 362mpa, tensile yield strength is 347mpa, and elongation percentage is 5%.
Embodiment 6
Design is chosen mg-2.0mn-0.5al-1.4ca (wt%) alloying component proportioning and is become magnesium alloy, and its no rare earth is inexpensive The preparation method of high intensity heat conductive magnesium alloy is as follows:
1) become ingot casting according to embodiment 1 methods described proportioning alloy raw material with smelting and pouring;
2) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding roughly shaped material, then pre- at 440 DEG C After heat, blank deformation is processed into by forging using forging technology, forging deformation speed is 0.5m/min, single pass rolling reduction is 30%~50%, accumulative deflection 80%, obtain no rare earth low-cost high-strength heat conductive magnesium alloy forging.
This forging parts material is 127w/ (m*k) in 20 DEG C of thermal conductivity factor, and room temperature (25 DEG C) tensile strength is 346mpa, tensile yield strength is 338mpa, and elongation percentage is 6%.(as subordinate list)
Embodiment 7
Design is chosen mg-1.5mn-1.0al-0.5ca (wt%) alloying component proportioning and is become magnesium alloy, and its no rare earth is inexpensive The preparation method of high intensity heat conductive magnesium alloy is as follows:
1) become ingot casting according to embodiment 1 methods described proportioning alloy raw material with smelting and pouring;
2) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding extrusion billet, then preheats at 350 DEG C Directly blank deformation is processed into by bar using extrusion process afterwards, extrusion speed is 5m/min, extrusion ratio is 25, bar after extruding Using air-cooled cooling, that is, obtain no rare earth low-cost high-strength heat conductive magnesium alloy.
This heat conductive magnesium alloy material is 137w/ (m*k) in 20 DEG C of thermal conductivity factor, and room temperature (25 DEG C) tensile strength is 360mpa, tensile yield strength is 350mpa, and elongation percentage is 6%.(as subordinate list)
Embodiment 8
Design is chosen mg-1.5mn-1.0al-1.0ca (wt%) alloying component proportioning and is become magnesium alloy, and its no rare earth is inexpensive The preparation method of high intensity heat conductive magnesium alloy is as follows:
1) become semicontinuous ingot casting with smelting and pouring according to embodiment 1 methods described proportioning alloy raw material;
2) the heat conductive magnesium alloy ingot casting of above-mentioned preparation is cut directly into corresponding extrusion billet, then preheats at 350 DEG C Afterwards blank deformation is processed into by bar using extrusion process, extrusion speed is 5m/min, extrusion ratio is 25.Bar is cut after extruding Continue to be processed using swaging deformation at 350 DEG C, obtain no rare earth low-cost high-strength heat conductive magnesium alloy.
This heat conductive magnesium alloy material is 129w/ (m*k) in 20 DEG C of thermal conductivity factor, and room temperature (25 DEG C) tensile strength is 375mpa, tensile yield strength is 358mpa, and elongation percentage is 7%.
Table 1

Claims (8)

1. one kind no rare earth low-cost high-strength heat conductive magnesium alloy, its chemical component weight percentage is: mn0.5~2.0wt%, Ca 0.5~1.5wt%, al 0.5~1.0wt%, remaining is mg and inevitable impurity;Described magnesium alloy is at 20 DEG C Thermal conductivity factor is more than 125w/ (m*k), and room temperature (25 DEG C) tensile strength is more than 340mpa, and tensile yield strength is more than 330mpa.
2. the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 1, is characterized in that, including with Lower step:
1) with simple metal or intermediate alloy as raw material, the magnesium alloy composition as described in claim 1 carries out dispensing;
2) simple metal and intermediate alloy are put into fusing in the crucible of smelting furnace, be prepared into alloy cast ingot;
3) no rare earth heat conductive magnesium alloy ingot casting is cut into respective blanks;
4) blank heating is carried out deformation process to predetermined deformation temperature, deformation temperature range is 300~500 DEG C, deform base Material should be heated to required deformation temperature within 10 minutes;This deformation process adopt in rolling, extruding or forging technology a kind of with Upper technique, obtains required no rare earth low-cost high-strength heat conductive magnesium alloy material.
3. the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 2, is characterized in that, step 2) In pure magnesium and mg-mn intermediate alloy be completely melt it is in co2And sf6Hybrid protection gas shielded under carry out, co2And sf6Flow Than for 40~100, after fusing, the temperature control of liquation is at 710~760 DEG C;Al ingot is heated to 250~310 DEG C in preheating furnace, Al ingot after preheating and ca particle are successively added in magnesium melt, plus during ca, needs Argon gas agitating, be then incubated 5~10 minutes; Using die cast or semi-continuous casting.
4. the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 2, is characterized in that, step 3) In, before non-rare earth heat conductive magnesium alloy ingot casting cuts into respective blanks, alloy cast ingot is heated to 490 under the protection of argon atmosphere ~515 DEG C of Homogenization Treatments carrying out 0.1~48 hour.
5. the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 2, is characterized in that, step 4) Blank deformation is processed into sheet material using rolling mill practice by middle deformation process, using extrusion process by blank deformation be processed into tubing, Blank deformation is processed various forging using forging technology by bar or section bar;Can also be combined using above-mentioned kinds of processes Deformation.
6. the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 2, is characterized in that, step 4) in, deformation process adopts rolling mill practice, and rolling deformation speed is 10~40m/min, and single pass rolling reduction is 30%~50%, Accumulative deflection >=90% of sheet material.
7. the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 2, is characterized in that, step 4) Middle deformation process adopts extrusion process, and crimp speed is 0.2~30m/min, and extrusion ratio is 10~50.
8. the preparation method of no rare earth low-cost high-strength heat conductive magnesium alloy as claimed in claim 2, is characterized in that, step 4) Middle deformation process adopts forging technology, and forging deformation speed is 0.1~30m/min, and single pass rolling reduction is 30%~50%, tires out Meter deflection >=60%.
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