Preparation and mechanical properties of in situ Al_2O_3/Al composites by adding NH_4AlO(OH)HCO_3  

添加NH_4AlO(OH)HCO_3原位生成Al_2O_3/Al复合材料的制备及其性能(英文)

作　　者：姜澜[1] 崔焱洲 史玉娟[3] 丁友东[1] 袁芳兰[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004 [2]邦迪管路系统(上海)有限公司,上海200131 [3]东北大学设计研究院有限公司,沈阳110013

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第10期2181-2185,共5页中国有色金属学报（英文版）

基　　金：Project(2009BAE80B01)supported by the Ministry of Science and Technology,China

摘　　要：Aluminium matrix composite reinforced by Al2O3 particles was produced by adding NH4AlO（OH）HCO3 into molten aluminum.The mechanical properties and wear behavior of the as-fabricated composites were studied.The results show that during stirring γ-Al2O3 particles were formed via decomposition reaction of NH4AlO（OH）HCO3,and the distribution of Al2O3 particles is more uniform in the matrix aluminum than directly added Al2O3 into molten aluminum.The density and the hardness values of the as-fabricated composites increase with increasing the particle volume fraction,while the tensile strength of the composites decreases with increasing the volume fraction of the Al2O3 particles.The wear rate of the composites decreases with increasing the volume fraction of the particle and loading.The in situ formed Al2O3/Al composite by adding NH4AlO（OH）HCO3 shows more superior mechanical and wear behaviors than that prepared by directly adding Al2O3 particles.碳酸铝铵与熔融的铝液反应原位生成颗粒增强铝基复合材料,对复合材料的力学性能和摩擦磨损行为进行研究。结果表明:在搅拌的铝熔体中碳酸铝铵发生分解反应生成γ-Al2O3;该原位反应的增强颗粒比直接添加的Al2O3在铝熔体中分布得更均匀;复合材料的密度和硬度随着增强相加入量的增加而提高,而强度则随着增强相加入量的增加而降低;磨损率随着增强相加入量的增加和载荷的增加而提高;原位反应生成的复合材料的力学性能和耐磨性明显优于直接添加Al2O3颗粒形成的复合材料的。

关 键 词：aluminum matrix composite NH4AlO（OH）HCO3 A12O3 particles microstructure HARDNESS tensile strength wear behavior 

分 类 号：TB331[一般工业技术—材料科学与工程]