Effects of base metal state on the microstructure and mechanical properties of Al-Mg-Si alloy friction stir-welded joints

被引：19

作者：

Xu, Z. Z. ^{[1
]}

Liu, C. Y. ^{[1
]}

Zhang, B. ^{[2
]}

Huang, H. F. ^{[1
]}

Cheng, W. ^{[1
]}

机构：

[1] Guilin Univ Technol, Key Lab New Proc Technol Nonferrous Met & Mat, Minist Educ, Guilin 541004, Peoples R China

[2] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China

来源：

JOURNAL OF MANUFACTURING PROCESSES | 2020年 / 56卷

基金：

中国国家自然科学基金;

关键词：

Al alloy; Heat treatment; Friction stir welding; Microstructure; Phase evolution; Mechanical properties; AGING BEHAVIOR; PRECIPITATION; EVOLUTION; STRENGTH;

D O I：

10.1016/j.jmapro.2020.04.084

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Al-Mg-Si alloys with different heat treatment states were used as base metals (BMs) in investigating the effect of BM state on the microstructure and mechanical properties of Al-Mg-Si alloy friction stir-welded (FSW) joints. The Al grains and insoluble phases of the FSW joints were not affected by BM state, but the compositions of the precipitated phases in the heat-affected zones (HAZs) and nugget zones (NZs) depended on the phase compositions of the BMs. The FSW joint that was welded using the BM with water quenching (WQ) and artificial aging state exhibited the greatest hardness among the joints at the same zones because of the high densities of the beta phases in the BM, the fine and high densities of the beta' phases in the HAZ, the high number of solution atoms, and the formation of Guinier-Preston zones in the NZ. Moreover, the joint exhibited the highest yield strength because of the high hardness of its HAZ, which is the fracture location in FSW joints. The FSW joint that was welded using the BM with WQ and natural aging state exhibited the highest ultimate tensile strength and tensile elongation because of its high structural uniformity.

引用

页码：248 / 257

页数：10

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