High temperature deformation behavior of friction stir welded 2024-T4 aluminum alloy sheets

被引：23
作者：
Wang, Z. B. [1 ]
He, Z. B. [1 ,2 ]
Fan, X. B. [1 ,2 ]
Zhou, L. [3 ]
Lin, Y. L. [3 ]
Yuan, S. J. [1 ,2 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
[3] Harbin Inst Technol Weihai, Sch Mat Sci & Engn, Weihai 264209, Peoples R China
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2017年 / 247卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Friction stir welding; Aluminum alloy sheet; Deformation behavior; Elevated temperature; Free bulging test; TENSILE PROPERTIES; MICROSTRUCTURE; PARAMETERS; JOINTS;
D O I：
10.1016/j.jmatprotec.2017.04.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The deformation behavior was characterized using uniaxial tensile and free bulging testing. Digital Image Correlation (DIC) system was used to probe the full strain fields during the whole bulging process. Thickness distribution of the friction stir welded (FSW) sheet was analyzed and compared with the base metal. The flow stress of FSW joint was lower than that of base metal at the temperature of 400 degrees C and initial strain rate of 0.001 s(-1). The ultimate tensile strength of FSW joint was about 70% of the base metal. The deformation was concentrated in the nugget zone of the weld during both uniaxial tensile tests and free bulging tests at high temperature, exhibiting significant inhomogeneous deformation characteristic. The bulging height of FSW sheet was only 50% of the base metal. The directions of major strains of weld zone and adjacent base material in the FSW sheet were vertical to each other during bulging tests. Such an incompatible deformation behavior resulted in the poor formability of FSW sheet compared with base metal.
引用
收藏
页码：184 / 191
页数：8
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