原位Al_2O_3和TiB_2粒子增强Al-Cu合金基复合材料的制备和性能  

FABRICATION AND PROPERTIES OF IN SITU Al 2O 3 AND TiB 2 PARTICLES REINFORCED Al Cu ALLOY COMPOSITES

作　　者：马宗义[1,2] 吕毓雄[1,2] 毕敬[1,2] 

机构地区：[1]中国科学院金属研究所 [2]上海交通大学金属基复合材料国家重点实验室

出　　处：《中国有色金属学报》1999年第1期101-105,共5页The Chinese Journal of Nonferrous Metals

摘　　要：由ＴｉＯ２ＡｌＢＣｕＯ体系制备了原位Ａｌ２Ｏ３和ＴｉＢ２粒子增强Ａｌ３．２％Ｃｕ和Ａｌ６．０％Ｃｕ合金基复合材料。Ｘ射线衍射分析表明，在两种复合材料中均有Ａｌ２Ｏ３和ＴｉＢ２生成，没有发现Ａｌ３Ｔｉ相产生。原位生成的Ａｌ２Ｏ３和ＴｉＢ２粒子为尺寸小于２μｍ的等轴状粒子，在Ａｌ基体中均匀分布。室温拉伸试验表明两种ＡｌＣｕ合金基原位复合材料具有很高的强度，并且随着基体合金中Ｃｕ含量的增加复合材料的强度增加。动态压缩试验表明，这种ＡｌＣｕ合金基原位复合材料的强度对应变速率是不敏感的，这可由不同应变速率变形后的复合材料基体中位错密度大致相同来解释。高温压缩蠕变试验表明，两种复合材料均表现出高的显态应力指数。随基体合金中Ｃｕ含量的增加复合材料的蠕变抗力明显提高。In situ Al 2O 3 and TiB 2 particles reinforced Al 3.2% Cu and Al 6.0%Cu alloy composites were fabricated from TiO 2 Al B CuO system. X ray diffraction analyses indicate that Al 2O 3 and TiB 2 are formed in two composites and no Al 2Ti appears, in situ formed Al 2O 3 and TiB 2 particles with a size of less than 2 μm are equiaxed and well distributed in Al matrix. Tensile tests at room temperature indicate that two Al Cu alloy matrix composites exhibit high strength, which increases with increasing Cu content of matrix alloy. Dynamic compression tests demonstrate that the strength of the Al Cu alloy matrix composites is insensitive to the strain rates, which can be explained by approximately identical dislocation density in the matrix of the composites deformed at different strain rates. Compressive creep tests at high temperature show that both composites exhibit high apparent stress exponents and the creep resistance of the composites is obviously increased with increasing Cu content of the matrix alloy.

关 键 词：复合材料 氧化铝 硼化钛 铝铜合金 制备 性能 

分 类 号：TB333[一般工业技术—材料科学与工程]