摘要
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。
The in-situ Mg2Si/Mg-9AI composite with different Si content （0.4wt%, 0.7wt% , 0.9wt%, 1.4wt%, 2.1wt% ） were fabricated by using simple weight cast technique. The cast structure characteristics and mechanical properties of the composite were investigated by optical microscope （OM）, scanning electron microscopy （SEM）, energy disperse spectrometry （EDS）, X-ray diffraction （XRD） and electronic tensile testing machine. The results show that the addition of Si has certain effects on the grain refinement of α-Mg matrix, little effect on β-Mg17A112 phase and a great impact on the morphology and quantity of Mg2Si phase. With the increase of Si content, α-Mg matrix grain decreases slightly and the grain size reach a minimum when the Si content is 0.9wt%. Mg2Si phase mainly occurs in the interior of α-Mg matrix grain. The morphology of Mg2Si phase changes from small bulk, strip, bulk, shape of Chinese characters into polygon. The number of M^Si phase increases. The tensile strength and elongation of Mg-9Al-xSi firstly increase and then decrease.
出处
《热加工工艺》
CSCD
北大核心
2014年第6期122-125,共4页
Hot Working Technology
基金
2013山西省高等学校科技创新项目(2013108)
太原理工大学大学生创新创业项目(12042)
国家自然科学青年基金项目(51301118)
