P／M—SiC_p增强LY12的研究

 采用粉末冶金方法（Ｐ／Ｍ）完成了ＳｉＣ颗粒增强ＬＹ１２的成形工艺和不同重量百分比条件下的力学性能实验。测试表明,含ＳｉＣ＿ｐ２０％（ｗｔ）的复合材料在室温下平均抗拉强度可达５９４ＭＰａ,延伸率为６％。其抗拉强度比ＬＹ１２ＣＺ提高３０％；２００℃拉伸时σ＿ｂ＝４９３ＭＰａ；３１５℃时σ＿ｂ＝２９９ＭＰａ。用扫描电镜及光学显微镜观察了ＬＹ１２粉末和试样断口的组织形貌。

RESEARCHING OF SiC_p REINFORCED LY12 ALLOY WITH POWDER METALLURGY METHOD

The forming process of SiC particle reinforced aluminium alloys was studied.With theultrasonic inert gas atomization technique aluminium powders were made. A fter mixing with SiCparticle, vacuum degassing and hot pressing,the extrusion was conducted.The mechanical prop-erties of the composite with different percentage SiC particles were evaluated.The room tempera-ture tensile strength of the composite with 20% SiC is 594 MPa and the elongation is 6%,Themaximum strengths at 200℃ and 3 15℃ are 493MPa and 299MP a respectively.The mopohology of the alloy powders and the fracture surface were analyzed with SEM.Tensile tests were performed in MTS-880 and AG-5000A.