摘要
采用真空压力浸渍法制备了碳化硅颗粒增强铸造镁合金（ＺＭ５）复合材料，碳化硅颗粒的平均尺寸为４μｍ，体积分数为４５％。通过透射电镜（ＴＥＭ）、能量色散谱仪（ＥＤＳ）研究了这种复合材料的ＳｉＣＰ／Ｍｇ界面微结构。实验结果表明：碳化硅颗粒与镁基体的界面结合紧密，界面区域存在合金元素铝的偏聚，并形成块状和细针状γ（Ｍｇ１７Ａｌ１２）相，这种γ相提高了界面结合强度。在ＳｉＣＰ／Ｍｇ界面区域存在高密度的位错缠结，这将对复合材料整体强度的提高作出贡献。另外，在有些ＳｉＣＰ／Ｍｇ界面上观察到氧化镁微晶层以及较大的氧化镁颗粒。
A magnesium matrix (AZ91) composite reinforced by silicon carbide particulates (SiCp) was fabricated using vacuum pressure infiltration. The reinforcing particles′ average size and volume fraction were about 4μm and 45%, respectively. The interfacial structure of SiCP/Mg was investigated by means of transmission electron microscopy (TEM) and energy dispersive X-ray spectrometry (EDS). The experimental results show that the magnesium matrix is in intimate contact with the particles at the SiCP/Mg interface, and segregation of Al to the interface region is present. There are some needle-like and block-like γ(Mg_17Al_12) phases at the interface, which improves the interface bonding strength. High density dislocation tangles are also observed in the SiCP/Mg interface region, which contribute to the high strength of the composite. Also, a thin microcrystalline layer of MgO and bigger MgO particles are observed at the interface.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1998年第1期37-41,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金
关键词
碳化硅颗粒
镁合金
复合材料
界面微结构
silicon carbide particles, magnesium alloy, composites, interfacial microstructure
