摘要
利用纯Mg和Mg-20Ce(La)氧化燃烧粉末对AZ31B合金熔体进行孕育处理,研究孕育细化效果和力学性能,并对含等量Ce和La的AZ31B合金进行对比。结果表明:氧化燃烧粉末可有效孕育细化AZ31B镁合金并提高其力学性能,其中Mg-20La氧化燃烧粉末细化效果最好,晶粒细化率达67%,抗拉强度、屈服强度与断裂应变提升最为显著,分别比AZ31B镁合金提升59%、31%和75%。热力学计算结果表明,Ce_(2)O_(3)和La_(2)O_(3)等氧化物在镁熔体中能被还原并生成Al_(4)Ce与Al_(11)La_(3)化合物,吸附于α-Mg晶粒表面抑制晶粒生长,与MgO异质形核核心协同细化合金晶粒,改善了合金的力学性能。
AZ31B alloy melt was inoculated with pure Mg and Mg-20Ce(La)oxidized combustion powder,and the inoculation refining effect and mechanical properties were studied.The testing results of AZ31B alloy containing equal amount of Ce and La were compared.The present work shows that the oxidized combustion powder can effectively inoculate and refine AZ31B magnesium alloy and improve its mechanical properties.Mg-20La oxidized combustion powder have the best refining effect with the grain refining rate up to 67%,and the tensile strength,yield strength and fracture strain of AZ31B magnesium alloy are increased by 59%,31%and 75%,respectively.Thermodynamic calculation results show that Ce_(2)O_(3) and La_(2)O_(3) can be chemically reduced in magnesium melt and then Al_(4)Ce and Al_(11)La_(3) compounds can be generated.They adsorb on the grain surface of α-Mg to inhibit the grain growth,and cooperate with MgO heterogeneous nuclei to refine alloy grains and improve the mechanical properties of the alloy.
作者
赵兵
廖恒斌
杜军
ZHAO Bing;LIAO Heng-bin;DU Jun(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,Guangdong,China)
出处
《铸造》
CAS
北大核心
2021年第5期526-531,共6页
Foundry
基金
国家自然科学基金(51871100)。
