采用粉末冶金工艺制备了一种SiC颗粒体积分数为30％的SiCp/2024A1复合材料,利用扫描电镜(SEM)、透射电镜(TEM)、能谱(EDS)、电子拉伸和硬度等测试方法研究了不同热处理参数对材料微观组织和力学性能的影响.结果表明:当固溶处理温度达到505℃,可溶相充分回溶,仅剩下含量极少的不可溶相残留在基体中,同时复合材料获得较高的强度;人工时效时间超过100 min后,材料的布氏硬度迅速升高,4.5h达到峰值,到10 h没有明显的过时效引起的硬度下降.棒针状纳米析出相(S′相)弥散分布于基体中提高复合材料的性能.碳化硅颗粒的加入加速了基体合金的时效动力学,但是基体合金的时效析出过程并没有改变.
30％ SiCp/2024 aluminum alloy matrix composites were produced by powder metallurgy process.The effect of heat treatment process on microstructure and mechanical properties of the composites was characterized by means of SEM,EDS analysis,TEM,tensile and hardness tests,respectively.The results show that when the solution treatment temperature reaches 505 ℃,the soluble phases dissolve thoroughly and only a minute quantity of insoluble residues remain in the matrix,and the composites exhibit higher tensile strength.When the artificial aging time is more than 100 min,Brinell hardness of the composites increases rapidly,and reaches its peak value at 4.5 h,and will not decrease significantly even after 10 h because of overaging.The properties of the composites are improved by the dispersion of needle like nano precipitated phase (S' phase) in the matrix.The addition of silicon carbide particles accelerates the aging kinetics of the matrix alloy,but does not change the aging precipitation process.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%