CN1360078A - Solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency - Google Patents
Solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency Download PDFInfo
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- CN1360078A CN1360078A CN 01139042 CN01139042A CN1360078A CN 1360078 A CN1360078 A CN 1360078A CN 01139042 CN01139042 CN 01139042 CN 01139042 A CN01139042 A CN 01139042A CN 1360078 A CN1360078 A CN 1360078A
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Abstract
A solid-dissolving reinforced high-strength cast Mg-alloy with low thermocracking tendency is characterized by that on the basis of Mg-alloy formula, the Zn content is decreased, the Ce-enriched rare-earth mixture is used, and the contents of Al, Mn and other elements are regulated. Its castings are made up through low-pressure or sand-mould casting, solid dissolving and ageing for higher mechanical performance and machinability.
Description
Technical field:
What the present invention relates to is a kind of magnesium alloy that is applicable to low-pressure casting and sand mold casting, relates in particular to a kind of solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency, has low heat cracking tendency and obvious heat treatment reinforcement effect, belongs to metal material field.
Background technology:
Magnesium alloy is a structured material the lightest in the practical application, and it has light specific gravity, specific tenacity height, specific rigidity height, advantages such as damping capacity, excellent cutting performance.Because the needs in market and improving constantly of technician's design level, Mg alloy castings develops in the direction towards thin-wall complicatedization.Mg-Al-Zn alloy A Z91 has advantages of good casting, and good comprehensive mechanical performance and cheap price have obtained using widely.Owing to contain higher Zn in the alloy, produce the low melting point phase at the crystal boundary place, thereby use mixedly when producing thin-walled, intricate casting, have bigger hot cracking tendency.The shape and size that this has not only caused scrapping of a large amount of foundry goods even has seriously limited designed part.Though the defined alloy of the AM100A-T6 of U.S.'s trade mark has castability preferably, and is cheap, mainly precipitation strength after its thermal treatment by Al, the insufficient strength height after T6 handles.In addition, Mg-Zn-Zr system and Mg-RE-Zr alloy are owing to contain more precious metal Zr, and price is higher, and its application is subjected to certain limitation.In view of above reason, people wish to find a kind of alloy always, and it has lower hot cracking tendency, can be used to produce thin-wall complicated foundry goods, and higher comprehensive mechanical performance and good heat treatment reinforcement effect, and it also will have comparatively cheap price.Through literature search repeatedly, also there is not to find to have the cast magnesium alloys that low heat cracking tendency, high heat treatment reinforcement effect and cheap price combine so far.
Summary of the invention:
The objective of the invention is to deficiency at the existing above-mentioned performance of alloy, a kind of new solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency is proposed, make it to have low heat cracking tendency, good complex thin-wall spare casting forming function, higher comprehensive mechanical performance and cheap characteristic, have better market prospect.
For realizing such purpose, the present invention has reduced the content of Zn in the prescription of magnesium alloy, adds the mishmetal RE of rich Ce, and adjusts the content of Al, Mn and other element in right amount, to improve the magnesium alloy cast performance, comprehensive mechanical property and heat treatment reinforcement effect.Magnesium alloy of the present invention can adopt methods such as low-pressure casting, sand mold casting to prepare moulding, and foundry goods improves its comprehensive mechanical property by solid solution and ageing treatment (T6 processing).
RE can improve the magnesium alloy cast performance, reduces crystal boundary low melting point precipitate, improves comprehensive mechanical property and good solid solution strengthening effect, and abundant at China's reserves, cost is low; Zn can improve fluidity of molten, and obvious solid solution strengthening effect is arranged, but the adding of Zn can obviously increase the hot cracking tendency of alloy, worsens casting forming function.By the reinforcement of RE to crystal boundary, and and Zn, Al to the beneficial effect of the mechanical property of alloy, and various elements is reasonably combined, makes to compare (T6 processing) effect that has better solution strengthening with AM100-T6, compares with AZ91 to have lower hot cracking tendency.Do not contain noble element in the alloy, with low cost.Alloy is used to produce the big-and-middle-sized structural part that thin-walled, complexity have lightweight to require, and can adopt low-pressure casting, sand mold casting, precision casting or disappearance modeling method casting.
Magnesium alloy component prescription of the present invention (mass percent) is: 7.5～9.5%Al, 0.25～1.6%RE (rich Ce mishmetal), 0.05～0.5%Mn, 0～0.4%Zn, 0.001～0.005%Be, impurity element Si≤0.02%, Fe≤0.015%, Ni≤0.002%, all the other are Mg.
Foundry goods is handled to strengthen performance by T6 (solid solution+timeliness), and concrete technology is as follows: the heat treatment furnace of foundry goods being put into 415 ± 5 ℃ under protective atmosphere carries out solution treatment, and soaking time is: wall thickness is 14～24 hours greater than 12mm spare; Wall thickness is 6～12 hours less than 12mm.Carry out ageing treatment again after taking out air cooling, promptly be placed in 175 ± 5 ℃ the heat treatment furnace insulation 16 hours, take out air cooling.
The present invention has substantial progress and wide commercial application prospect.Under the situation of not obvious raising cost of alloy, improve the preparation processability and the comprehensive mechanical property of alloy greatly.Any common magnesium alloy smelting method melting be can adopt, low-pressure casting or sand mold casting under the condition of gas shield or flux protection, carried out.Adopt the hot cracking tendency of the around-France beta alloy of hot tearing: critical fracture diameter is Φ 88 (being that ring width is 10), the critical fracture diameter of AZ91 under the same terms is Φ 58 (being that ring width is 25) (the critical fracture diameter of alloy hot cracking tendency big more or the more little then alloy of ring width is more little), and its hot cracking tendency is significantly smaller than the AZ91 alloy.Alloy room temperature tensile strength, yield strength, elongation are respectively greater than 170Mpa, 100Mpa, 2.5% under the low-pressure casting condition; Room temperature tensile strength, yield strength, elongation are respectively greater than 220Mp, 110Mpa, 4.2% under the T6 condition.Room temperature tensile strength under the sand mold casting condition, yield strength, elongation are respectively greater than 150Mp, 80Mpa, 2.3%; Room temperature tensile strength under the sand mold casting T6 treatment condition, yield strength, elongation are respectively greater than 210Mpa, 110Mpa, 4.0%.Embodiment:
Below in conjunction with embodiment technical scheme of the present invention is further described:
Embodiment 1:
Alloying constituent (weight percent): 9.0%Al, 0.25%RE, 0.05%Mn, 0.4%Zn, 0.002%Be, impurity element Si≤0.01%, Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, all the other are Mg.
According to mentioned component configuration alloy, at CO
2+ SF
6Add 15 kilograms of pure magnesiums in the gas shield electrical crucible; after alloy melts fully; successively add commercial-purity aluminium 1408 grams, Mg-10RE alloy 414 grams, Al-10Mn alloy 82.9 grams, industrial-purity zinc 66 grams, Al-4Be alloy 8.3 grams; alloy liquid is fully stirred in the dissolving back; persistently overheating during to 730 ℃ with scouring agent refining 10 minutes; drag for surface scum, be incubated static 20 minutes then, carry out low-pressure casting at 720 ℃.
The T6 thermal treatment process that foundry goods adopts is that placement one cuvette SULPHUR POWDER rises to 415 ℃ with furnace temperature in the heat treatment furnace, and foundry goods is put into back insulation 9 hours, takes out air cooling.Aging treatment process is, the foundry goods after the solution treatment is placed in 175 ℃ the heat treatment furnace insulation 16 hours, takes out air cooling.
Magnesium alloy room temperature tensile strength, yield strength and the elongation of this example are respectively 178MPa, 109MPa, 3.6%; Room temperature tensile strength, yield strength and elongation after T6 handles are respectively 225MPa, 131MPa, 5.6%, and cast form performance, cavity filling are good.
Embodiment 2:
Alloying constituent (weight percent): 7.5%Al, 0.9%RE, 0.1%Mn, 0.2%Zn, 0.001%Be, impurity element Si≤0.01%, Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, all the other are Mg.
According to mentioned component configuration alloy, at CO
2+ SF
6Add 15 kilograms of pure magnesiums in the gas shield electrical crucible; after alloy melts fully; successively add commercial-purity aluminium 1089 grams, Mg-10RE alloy 1492 grams, Al-10Mn alloy 166 grams, industrial-purity zinc 33 grams, Al-4Be alloy 5 grams; alloy liquid is fully stirred in the dissolving back; persistently overheating during to 730 ℃ with scouring agent refining 10 minutes; drag for surface scum, be incubated static 20 minutes then, carry out low-pressure casting at 720 ℃.
T6 thermal treatment process that foundry goods adopts and aging treatment process are with embodiment 1.
Magnesium alloy room temperature tensile strength, yield strength and the elongation of this example are respectively 181MPa, 112MPa, 4.5%; Room temperature tensile strength, yield strength and elongation after T6 handles are respectively 232MPa, 115MPa, 6.1%, and cast form performance, cavity filling are good.
Embodiment 3:
Alloying constituent (weight percent): 8%Al, 1.6%RE, 0.5%Mn, 0.001%Be, impurity element Si≤0.01%, Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, all the other are Mg.
According to mentioned component configuration alloy, at CO
2+ SF
6Add 15 kilograms of pure magnesiums in the gas shield electrical crucible; after alloy melts fully; successively add commercial-purity aluminium 589 grams, Mg-10RE alloy 2710 grams, Al-10Mn alloy 847 grams, Al-4Be alloy 4 grams; alloy liquid is fully stirred in the dissolving back; persistently overheating during to 730 ℃ with scouring agent refining 10 minutes; drag for surface scum, be incubated static 20 minutes then, carry out low-pressure casting at 720 ℃.
T6 thermal treatment process that foundry goods adopts and aging treatment process are with embodiment 1.
Magnesium alloy room temperature tensile strength, yield strength and the elongation of this example are respectively 189MPa, 105MPa, 4.6%; Room temperature tensile strength, yield strength and elongation after T6 handles are respectively 225MPa, 132MPa, 4.0%, and cast form performance, cavity filling are good.
Claims (1)
1, a kind of solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency, the mass percent that it is characterized in that component prescription is 7.5～9.5%Al, 0.25～1.6% rich Ce mishmetal RE, 0.05～0.5%Mn, 0～0.4%Zn, 0.001～0.005%Be, impurity element Si≤0.02%, Fe≤0.015%, Ni≤0.002%, all the other are Mg, alloy after methods such as low-pressure casting, sand mold casting prepare moulding, foundry goods again by solid solution and ageing treatment to strengthen performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011390425A CN1169989C (en) | 2001-12-04 | 2001-12-04 | Solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011390425A CN1169989C (en) | 2001-12-04 | 2001-12-04 | Solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency |
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| Publication Number | Publication Date |
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| CN1360078A true CN1360078A (en) | 2002-07-24 |
| CN1169989C CN1169989C (en) | 2004-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011390425A Expired - Fee Related CN1169989C (en) | 2001-12-04 | 2001-12-04 | Solid solution reinforced cast Mg alloy with high strength and low thermocracking tendency |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424216C (en) * | 2006-10-14 | 2008-10-08 | 重庆工学院 | Solution treatment method for Mg-Al series cast magnesium alloy heat treatment reinforcement |
| CN100493778C (en) * | 2006-07-10 | 2009-06-03 | 浙江高中压阀门有限公司 | Sand mould casting method for large-scale high-temperature alloy cast |
| CN102002654A (en) * | 2010-12-15 | 2011-04-06 | 重庆研镁科技有限公司 | Heat treatment process for improving strength and plasticity of magnesium alloy |
| CN112877575A (en) * | 2021-01-13 | 2021-06-01 | 鼎泰(江苏)轻合金有限公司 | Mg-Al series magnesium alloy and preparation method and application of pipe thereof |
-
2001
- 2001-12-04 CN CNB011390425A patent/CN1169989C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100493778C (en) * | 2006-07-10 | 2009-06-03 | 浙江高中压阀门有限公司 | Sand mould casting method for large-scale high-temperature alloy cast |
| CN100424216C (en) * | 2006-10-14 | 2008-10-08 | 重庆工学院 | Solution treatment method for Mg-Al series cast magnesium alloy heat treatment reinforcement |
| CN102002654A (en) * | 2010-12-15 | 2011-04-06 | 重庆研镁科技有限公司 | Heat treatment process for improving strength and plasticity of magnesium alloy |
| CN112877575A (en) * | 2021-01-13 | 2021-06-01 | 鼎泰(江苏)轻合金有限公司 | Mg-Al series magnesium alloy and preparation method and application of pipe thereof |
| CN112877575B (en) * | 2021-01-13 | 2022-03-15 | 鼎泰(江苏)轻合金有限公司 | Mg-Al series magnesium alloy and preparation method and application of pipe thereof |
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| Publication number | Publication date |
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| CN1169989C (en) | 2004-10-06 |
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