Microstructure evolution of alumina dispersion strengthened copper alloy deformed under different conditions  

Cu-A1_2O_3弥散强化铜合金在不同条件下变形的显微组织与结构演变(英文)

作　　者：李灵[1] 李周[1,2] 雷前[2] 肖柱[3] 刘斌[1] 刘娜[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中南大学有色金属材料与工程教育部重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第12期3953-3958,共6页中国有色金属学报（英文版）

基　　金：Project(51271203)supported by the National Natural Science Foundation of China;Project(YSZN2013CLD6)supported by the Nonferrous Metals Science Foundation of HNG-CSU;China;Project supported by the Program Between the CSC(China Scholarship Council)and the DAAD(German Academic Exchange Service)

摘　　要：Microstructure and texture evolution of Cu-0.23%Al2O3 dispersion strengthened copper alloy, deformed at room temperature or cryogenic temperature, were investigated. The main textures in hot-extruded specimen were Brass {011} 〈211〉 and Cube {100} 〈100〉. Textures of Brass {011} 〈211〉 and Goss {011} 〈100〉 were observed in specimen after deformation at room temperature; while textures of Brass {011} 〈211〉, Goss {011} 〈100〉 and S {123} 〈634〉 were detected after deformation at cryogenic temperature. It is believed that the additional Al2O3 nanoparticles can result in dislocation pinning effect, which can further lead to the suppression of dislocations cross-slip. While in the specimen deformed at cryogenic temperature, both pinning effect and cryogenic temperature are responsible for the formation of Brass, Goss and S textures.对Cu-0.23%A12O3弥散强化铜合金在超低温变形和室温变形过程中的显微组织与织构演变进行研究。结果表明:Cu-A12O3弥散强化铜合金在热挤压后形成黄铜织构Brass{011}?211?和立方织构Cube{100}?100?;合金在室温变形后主要形成Brass{011}?211?织构和Goss{011}?100?织构;合金在超低温变形后主要形成黄铜织构Brass{011}?211?、高斯织构Goss{011}?100?和剪切织构S{123}?634?。在室温变形过程中,决定织构类型的主要因素则仅是Al2O3纳米粒子钉扎效应产生的对位错交滑移的抑制作用。而Cu-A12O3弥散强化铜合金在超低温变形过程中,决定织构类型的主要因素包括超低温和Al2O3纳米粒子钉扎效应二者共同产生的对位错交滑移的抑制作用。

关 键 词：cryogenic deformation microstructure TEXTURE dispersion strengthened copper alloy 

分 类 号：TG146.11[一般工业技术—材料科学与工程]