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研究了Sb对Mg-4Al-4Si(AS44)镁合金显微组织和力学性能的影响。结果表明,未加Sb时,铸态AS44合金主要由α-Mg基体、β-Mg17Al12相和Mg2Si相组成,Mg2Si相呈粗大的骨骼状、块状和汉字状3种形态;加入少量的Sb(0.25%~1.25%)能有效细化Mg2Si相,并在合金中形成高熔点和较为弥散分布的Mg3Sb2相。随Sb含量的增加,Mg2Si相形貌发生显著变化,从粗大的骨骼状逐渐转变为块状和汉字状,当Sb含量达到1.25 wt%时,几乎全部转变为较细小的汉字状Mg2Si相颗粒。随着组织的改善,合金的抗拉强度、屈服强度和伸长率均得到不同程度的提高。
The effect of Sb on the microstructure and mechanical properties of Mg-4Al-4Si (AS44) magnesium alloy was studied. The results show that the as-cast AS44 alloy is mainly composed of α-Mg matrix, β-Mg17Al12 phase and Mg2Si phase without addition of Sb, and the Mg2Si phase is coarse with three forms of bone, block and Chinese character. Adding a small amount of Sb 0.25% ~ 1.25%) can effectively refine the Mg2Si phase and form a high melting point and more dispersed Mg3Sb2 phase in the alloy. With the increase of Sb content, the morphology of Mg2Si phase changed significantly from coarse bone to massive and Chinese character. When the content of Sb reached 1.25 wt%, almost all turned into smaller Chinese character Mg2Si phase particles. With the improvement of the organization, the tensile strength, yield strength and elongation of the alloy have been improved to some extent.