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研究了Te变质处理对原位自生Mg_2Si/AZ91D复合材料组织与力学性能的影响,探索了变质机理。结果表明:Te变质使复合材料中初生Mg_2Si基本消失,共晶Mg_2Si数量增多,尺寸减小,并且部分共晶Mg_2Si由汉字状变成了蠕虫状和短杆状,β-Mg_(17)Al_(12)由断续的网状变成了细小的板条状、颗粒状。α-Mg基体的晶粒尺寸随Te含量的增加而减小。Te含量为0.7%时,复合材料的室温和高温(150℃)力学性能最佳。
The effect of Te modification on the microstructure and mechanical properties of in-situ Mg_2Si / AZ91D composites was studied, and the metamorphic mechanism was explored. The results show that the primary Mg 2 Si disappears in the composites, the amount of eutectic Mg 2 Si increases and the size decreases, and some eutectic Mg 2 Si turns into worm-like and short rod-like, β-Mg_ (17) Al_ 12) By the intermittent mesh into a small lath, granular. The grain size of α-Mg matrix decreases with increasing Te content. When the content of Te is 0.7%, the composites have the best mechanical properties at room temperature and high temperature (150 ℃).