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利用原位内生法制备了不同Si含量(0.4wt%,0.7wt%,0.9wt%,1.4wt%,2.1wt%)的Mg2Si/Mg-9Al复合材料。采用OM、XRD、EDS、SEM及电子拉伸试验机等设备研究了该复合材料的铸态组织特征及力学性能。结果表明:Si的添加对α-Mg基体晶粒有细化作用,对β-Mg17Al12相影响不大,但对Mg2Si相的形态、数量影响较大。随Si含量增加,α-Mg基体晶粒略有减小,当Si含量为0.9wt%时,晶粒达到最小;Mg2Si相主要出现在α-Mg基体晶粒内部,形态由小块状演变为条状、块状、汉字状直至多角状,其数量则随Si含量的增加而增加。Mg-9Al-x Si的抗拉强度和伸长率呈先升后降的趋势。
Mg2Si / Mg-9Al composites with different Si contents (0.4wt%, 0.7wt%, 0.9wt%, 1.4wt%, 2.1wt%) were prepared by in situ method. The as-cast microstructure and mechanical properties of the composites were investigated by OM, XRD, EDS, SEM and electronic tensile testing machine. The results show that the addition of Si has the effect of refining the α-Mg matrix grains, but has little effect on the β-Mg17Al12 phase, but has a great influence on the morphology and amount of Mg2Si phase. With the increase of Si content, the grain size of α-Mg matrix slightly decreases, and when the content of Si is 0.9wt%, the grain size is the smallest. The Mg2Si phase mainly appears inside the α-Mg matrix grain, Strips, blocks, Chinese characters up to the polygon, the number increases with the Si content increases. The tensile strength and elongation of Mg-9Al-xSi first and then decrease.