Effect of temperature on mechanical alloying of Cu-Zn and Cu-Cr system

来源期刊：中国有色金属学报(英文版)2009年第5期

论文作者：左可胜 席生岐 周敬恩

文章页码：1206 - 1214

Key words：Cu-Cr system; Cu-Zn system; mechanical alloying; phase transformation; mixing enthalpy

Abstract: Cu-Zn and Cu-Cr powders were milled with an attritor mill at room temperature, -10, -20 and -30 ℃, respectively. Phase transformation and morphology evolution of the alloyed powder were investigated by X-ray diffractometry(XRD), X-ray photoelectron spectroscopy(XPS) and scanning electron microscopy(SEM). The results show that lowering temperature can delay mechanical alloying(MA) process of Cu-Zn system with negative mixing enthalpy, and promote MA process of Cu-Cr system with positive mixing enthalpy. As for Cu-Cr and Cu-Zn powders milled at -10 ℃, lamellar structures are firstly formed, while fewer lamellar particles can be found when the powder is milled at -20 ℃. When the alloyed powder is annealed at 1 000 ℃, Cu(Cr) solid solution is decomposed and Cr precipitates from Cu matrix, whereas Cu(Zn) solid solution keeps stable.

基金信息：the Specialized Research Fund for the Doctoral Program of Higher Education of China
Chinese Ministry of Education
Program for New Century Excellent Talents in University