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_(11)Nd_(3)和β-Mg_(17)Al_(12)相含量减少,Al2Ca相增多。α-Mg、Al_(2)Nd、Al_(11)Nd_(3)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℃,Al_(2)Nd相的析出温度由630℃下降至610℃,而Al_(2)Ca相的析出温度则由504℃升高至529℃。Mg-6Al-2Nd_(-x)Ca(x=0、0.5,%)合金的凝固路径为L→Al_(2)Nd;L→α-Mg;L_(Al)+Al_(2)Nd→Al_(11)Nd_(3);L→α-Mg+β-Mg_(17)Al_(12)。Mg-6Al-2Nd_(-x)Ca合金(x=1.0、1.5、2.0、2.5、3.0,%)的凝固路径为L→Al_(2)Nd;L→α-Mg;L→α-Mg+Al_(2)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。
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, OM, 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 Al11Nd3and β-Mg17Al12phases is decreased, and the content of the Al2Ca phase is increased. The precipitation temperature of α-Mg, Al2Nd, and Al11Nd3phases 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 Al2Nd phase is decreased from 630 ℃ to 610 ℃, while the precipitation temperature of Al2Ca phase is increased from 504 ℃ to 529 ℃. The solidification path of Mg-6 Al-2 Nd-xCa(x=0, 0.5,%) alloy is L→Al2Nd, L→α-Mg, LAl+Al2Nd→Al11Nd3, L→α-Mg+β-Mg17Al12. The solidification path of Mg-6 Al-2 Nd-xCa alloy(x=1.0, 1.5, 2.0, 2.5, 3.0,%) is L→Al2Nd, L→α-Mg, L→α-Mg+Al2Ca. 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.
作者
邢斯翀
冯义成
王雷
王丽萍
赵思聪
Xing Sichong;Feng Yicheng;Wang Lei;Wang Liping;Zhao Sicong(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2022年第11期1419-1424,共6页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51804090)
黑龙江省自然科学基金资助项目(E2018045)。
关键词
镁合金
凝固路径
显微组织
等温液淬
Magnesium Alloy
Solidification Path
Microstructure
Isothermal Liquid Quenching
