Microstructure and nanomechanical behavior of friction stir welded joint of 7055 aluminum alloy

被引：39

作者：

Wang, Wen ^{[1
,2
,3
]}

Yuan, Shengnan ^{[1
,2
]}

Qiao, Ke ^{[1
,2
]}

Wang, Kuaishe ^{[1
,2
]}

Zhang, Shengyi ^{[1
,2
]}

Peng, Pai ^{[1
,2
]}

Zhang, Ting ^{[1
,2
]}

Peng, Han ^{[1
,2
]}

Wu, Bing ^{[1
,2
]}

Yang, Juan ^{[1
,2
]}

机构：

[1] Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China

[2] Xian Univ Architecture & Technol, Natl & Local Joint Engn Res Ctr Funct Mat Proc, Xian 710055, Peoples R China

[3] Xian Univ Architecture & Technol, Expt Teaching Demonstrat Ctr Mat Proc, Xian 710055, Peoples R China

来源：

JOURNAL OF MANUFACTURING PROCESSES | 2021年 / 61卷

基金：

中国国家自然科学基金;

关键词：

Aluminum; Friction stir welding; Microstructure; Nanoindentation; Creep; MG-CU ALLOY; MECHANICAL-PROPERTIES; NANOINDENTATION CREEP; DEFORMATION MECHANISM; WELDING SPEED; POP-IN; EVOLUTION; STRENGTH; HARDNESS; RECRYSTALLIZATION;

D O I：

10.1016/j.jmapro.2020.11.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, microstructure characterization of friction stir welding (FSW) joint of 7055-T6 aluminum alloy was performed via scanning electron microscope, electron backscatter diffraction, and transmission electron microscope technology. The nanomechanical behavior of FSW joint was systematically studied using nanoindentation technique. The relationship between microstructure and nanomechanical behavior was established and the nanohardness and microhardness were analyzed. The results show that FSW led to grain refinement of aluminum alloy and continuous dynamic recrystallization and geometric dynamic recrystallization were the primary mechanisms of grain refinement. The precipitated phase dissolved and coarsened during FSW, which led to a decrease in the microhardness of the joint. The nano-hardness of each zone of the joint displayed indentation size effect. The creep behavior at room temperature conformed to the Voigt model, and dislocation glide was the primary creep mechanism. The stir zone (SZ) and thermo-mechanically affected zone (TMAZ) had high nano-hardness and elastic modulus, while TMAZ and heat-affected zone (HAZ) had high creep resistance at room temperature. The nanomechanical behavior was mainly affected by precipitation in the grain interior.

引用

页码：311 / 321

页数：11

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