Effects of thermal exposure on the mechanical properties and microstructure stability of an Al-Cu-Mg-Ag alloy

被引：0
|
作者：
Duan, Anjing [1 ]
Liu, Zhiyi [1 ]
Gao, Lifang [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
来源：
MANUFACTURING SCIENCE AND ENGINEERING, PTS 1-5 | 2010年 / 97-101卷
关键词：
Al-Cu-Mg-Ag alloy; thermal exposure; mechanical properties; microstructural stability; PRECIPITATE; PHASE;
D O I：
10.4028/www.scientific.net/AMR.97-101.675
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Mechanical properties and microstructural evolution of an Al-Cu-Mg-Ag alloy during thermal exposure at elevated temperature were characterized by means of tensile tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observation. The tensile test results suggested that tensile strength (sigma(b)) and yield strength (sigma(s)) reduced with both increasing exposure time and temperature. When exposed at 150 degrees C, the Al-Cu-Mg-Ag alloy exhibits good structural stability due to the splendid thermal stability of the Omega phase. SEM results showed that the specimen was fractured in a combined manner of intergranular and transgranular fracture. TEM results suggested the reduction of mechanical properties of samples was attributed to the coarsening of Omega phase and the precipitation of theta phase during thermal exposure.
引用
收藏
页码：675 / 678
页数：4
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