固溶处理对一种2xxx/SiC_p铝基复合材料组织和性能的影响  

Effect of Solid Solution Heat Treatment on Microstructure and Mechanical Properties of 2xxx/SiC_p Aluminum Matrix Composite

作　　者：何晓磊[1] 李沛勇[1] 李伟[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2010年第4期21-25,共5页Journal of Aeronautical Materials

摘　　要：采用快速凝固/粉末冶金工艺制备了一种2xxx/SiCp铝基复合材料,利用扫描电镜（SEM）、能谱（EDS）、室温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：当固溶温度为485℃时,仍有大量未溶解的可溶相θ（Al2Cu）,S（Al2CuMg）和极少量不可溶相AlCuFe存在于基体中,随固溶温度的升高,未溶解的可溶相逐渐回溶,当固溶温度达到500℃,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,固溶温度在490～500℃时,复合材料能同时获得较高的强度和塑性;淬火介质（水）温度超过60℃时,复合材料强度开始明显降低;自然时效时间超过60min后,材料的布氏硬度迅速提升,时效强化效果趋于明显。A 2xxx/SiCp composite was produced by rapidly solidified powder metallurgy（RS/PM）process.The microstructure and mechanical properties of the composite were investigated by means of SEM,EDS,tensile testing and hardness testing,respectively.The results show that massive solvable phases — θS and a minute quantity of insoluble phase AlCuFe existed in the matrix at 485℃.With the increase of solid solution treatment temperature,the solvable phases dissolved in matrix gradually.When the solid solution treatment temperature arrived at 550℃,the solvable phases dissolved thoroughly and only a minute quantity of insoluble remained in the matrix.The composite exhibited higher tensile strength and plasticity when the solid solution treatment temperature was 490~500℃.While the temperature of quenching agent（water）was above 60℃,the strength of composites started to decease.Brinell hardness of the composite increase rapidly and the effect of aging hardening was improved obviously after natural aging for 60 minutes.

关 键 词：2xxx/SiCp基复合材料 固溶热处理 微观组织 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理] TG111.8[金属学及工艺—金属学]