Mg-6Al-2Nd-xCa系耐热镁合金凝固路径分析

邢斯翀; 冯义成; 王雷; 王丽萍; 赵思聪

doi:10.15980/j.tzzz.2022.11.021

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Mg-6Al-2Nd-xCa系耐热镁合金凝固路径分析
Analysis of Solidification Path of Mg-6Al-2Nd-xCa Heat-resistant Magnesium Alloy
2022年42卷第11期页码：1419-1424
纸质出版日期： 2022 ，
DOI： 10.15980/j.tzzz.2022.11.021

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邢斯翀, 冯义成, 王雷, 等. Mg-6Al-2Nd-xCa系耐热镁合金凝固路径分析[J]. 特种铸造及有色合金, 2022,42(11):1419-1424.

Xing Sichong, Feng Yicheng, Wang Lei, et al. Analysis of Solidification Path of Mg-6Al-2Nd-xCa Heat-resistant Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2022,42(11):1419-1424.
邢斯翀, 冯义成, 王雷, 等. Mg-6Al-2Nd-xCa系耐热镁合金凝固路径分析[J]. 特种铸造及有色合金, 2022,42(11):1419-1424. DOI： 10.15980/j.tzzz.2022.11.021.

Xing Sichong, Feng Yicheng, Wang Lei, et al. Analysis of Solidification Path of Mg-6Al-2Nd-xCa Heat-resistant Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2022,42(11):1419-1424. DOI： 10.15980/j.tzzz.2022.11.021.

摘要

以Mg-Al-Nd-Ca合金为研究对象，通过测定不同Mg-6Al-2Nd-xCa合金(x=0、0.5、1.0、1.5、2.0、2.5、3.0

质量分数)凝固曲线，并通过重熔-等温液淬试验及XRD、OM、SEM、EDS等分析手段，研究了Ca对Mg-6Al-2Nd合金相形成及凝固路径的影响。结果表明，随着Ca含量增加，Al

和β-Mg

相含量减少，Al

Ca相增多。α-Mg、Al

Nd、Al

相的析出温度均随Ca含量的升高而降低，其中α-Mg相的析出温度由620℃下降至606℃

Nd相的析出温度由630℃下降至610℃

而Al

Ca相的析出温度则由504℃升高至529℃。Mg-6Al-2Nd-xCa(x=0、0.5

%)合金的凝固路径为L→Al

Nd;L→α-Mg;L

+Al

Nd→Al

;L→α-Mg+β-Mg

。Mg-6Al-2Nd-xCa合金(x=1.0、1.5、2.0、2.5、3.0

%)的凝固路径为L→Al

Nd;L→α-Mg;L→α-Mg+Al

Ca。重熔-等温液淬试验结果表明，等温液淬试验结果与凝固曲线分析结果一致。

Abstract

The Mg-6 Al-2 Nd-xCa alloys（x=0

0.5

1.0

1.5

2.0

2.5

3.0

%） were prepared

and the solidification curves were measured and analyzed

and then the microstructure was observed and analyzed by XRD

SEM

EDS and remelting-isothermal liquid quenching experiment method. The influence of Ca on the phase formation and solidification path of Mg-6 Al-2 Nd alloy was investigated. The experimental results indicate that with the increase of Ca content

the content of Al

and β-Mg

phases is decreased

and the content of the Al

Ca phase is increased. The precipitation temperature of α-Mg

and Al

phases is decreased with the increase of Ca content. The precipitation temperature of α-Mg is decreased from 620 ℃ to 606 ℃

and the precipitation temperature of Al

Nd phase is decreased from 630 ℃ to 610 ℃

while the precipitation temperature of Al

Ca phase is increased from 504 ℃ to 529 ℃. The solidification path of Mg-6 Al-2 Nd-xCa（x=0

0.5

%） alloy is L→Al

L→α-Mg

+Al

Nd→Al

L→α-Mg+β-Mg

. The solidification path of Mg-6 Al-2 Nd-xCa alloy（x=1.0

1.5

2.0

2.5

3.0

%） is L→Al

L→α-Mg

L→α-Mg+Al

Ca. The experimental results of the remelting-isothermal liquid quenching shows that the results of the isothermal liquid quenching experiment are consistent with those of the solidification curve analysis.