摘要
研究了挤压铸造法制备的ＳｉＣ＿ｗ／Ａｌ－Ｃｕ－Ｍｇ－Ｚｒ复合材料微观组织和性能。结果表明，ＳｉＣ晶粒均匀分布于基体中，复合材料中主要沉淀强化相为δ＇相、Ｓ＇相和δ＇相，ＳｉＣ＿ｗ与基体铝之间无明显的界面反应，界面附近存在δ＇相的无沉淀析出带（ＰＦＺ）。复合材料具有较高的室温强度和弹性模量，且密度低，热膨胀系数小。
The microstructure characteristics of SiCW/Al-Li-Cu-Mg-Zr composite fabricated by a squeeze castingmethod were studied by means of SEM, TEM and HRTEM techniques. Tensile test was conducted at roomtemperature. The results show that the SiC whiskers distribute uniformly in the matrix of the as-castedcomposite. The major precipitates in the T6-treated composite are δ' (Al3Li), S'(Al2CuMg) and β'(Al3Zr) phases. There is no obvious chemical reaction between the whiksers and the aluminum-lithiummatrix. The prepared composite exhibits higher tensile strength and elastic modulus as well as lower coffi-cients of thermal expansion.
出处
《航空材料学报》
CAS
CSCD
1995年第4期27-33,共7页
Journal of Aeronautical Materials
基金
国家自然科学基金
关键词
铝基
复合材料
铝锂合金
碳化硅晶须
航空材料
aluminum-matrix composite, aluminum-lithium alloy, SiC whisker, microstructure,tensile properties
