Dependence of microstructure and mechanical properties on hot-extrusion temperatures of the developed high-strength Cu40Zn-CrFeTiSn brass by powder metallurgy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:558

Article

Li, Shufeng¹  Imai, Hisashi¹  Kondoh, Katsuyoshi¹  Kojima, Akimichi²  Kosaka, Yoshiharu²  Yamamoto, Koji³  Takahashi, Motoi³ 

[1] Osaka Univ, Joining & Welding Res Inst, Osaka 5670047, Japan

[2] San Etsu Met Co Ltd, Tonami, Toyama, Japan

[3] Nippon Atomized Met Powders Corp, Noda, Chiba, Japan

关键词: Brass;    Extrusion;    Mechanical properties;    Solid solution;    Precipitation;    Powder metallurgy;   

DOI  :  10.1016/j.msea.2012.08.062

来源: Elsevier

【 摘 要 】

Effect of extrusion temperature on the microstructure and mechanical properties of the powder metallurgy Cu40Zn-CrFeTiSn alloy were investigated, through analysis on the solid solution of alloying elements, phase transformation and precipitation behavior. The extrusion was carried out between 500 degrees C and 650 degrees C using an extrusion ratio of 37:1. After extrusion, the microstructure was found consisting of the dual alpha+beta phase structure and precipitates dispersing uniformly in the matrix. The tensile strength gradually decreased when the extrusion preheating temperature was increased. Solid solubility of Ti and Cr decreased steadily and grain coarsening occurred with increase in the extrusion temperature. Consequently, the lower extrusion preheating temperature was necessary to obtain excellent final mechanical properties, thus the extrusion temperature of 500 degrees C was enough to produce good ductility while maintaining the promising values of mechanical properties after extrusion. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free