Microstructure and mechanical properties of heat affected zone in multi-pass GMA welded Al-Zn-Mg-Cu alloy

被引：6

作者：

Zhou, Jia-liang ^{[1
]}

Shu, Feng-yuan ^{[1
]}

Zhao, Hong-yun ^{[1
]}

Lu, Yao-hui ^{[2
]}

Liu, Yu-xin ^{[2
]}

He, Peng ^{[3
]}

机构：

[1] Harbin Inst Technol Weihai, Shandong Prov Key Lab Special Welding Technol, Weihai 264209, Peoples R China

[2] Natl Key Lab Remfg, Beijing 100072, Peoples R China

[3] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2019年 / 29卷 / 11期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Al-Zn-Mg-Cu alloy; heat affected zone; microstructure; mechanical properties; ductile/brittle composite fracture; CORROSION CRACKING BEHAVIOR; ALUMINUM-ALLOYS; EVOLUTION; JOINTS;

D O I：

10.1016/S1003-6326(19)65133-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Microstructure and mechanical properties of the heat affected zone (HAZ) in multi-pass gas metal arc (GMA) welded Al-Zn-Mg-Cu alloy plates were investigated, based upon which the mechanical anisotropy and fracture mechanism were analyzed. The microstructure and composition were analyzed by scanning electron microscope (SEM) and energy dispersive spectroscope (EDS). X-ray diffractometer (XRD), transmission electron microscope (TEM) and selective area electron diffraction (SAED) were used to analyze the phase composition. The distribution of microhardness was identified as gradual transition and tensile strength had a tendency to decrease first and then increase. The distribution of nano-sized eta(MgZn2) particles in the alpha(Al) matrix and Al2MgCu phase determined the tensile performances along the thickness direction and led to the formation of ductile/brittle composite fracture in the HAZ. The continuous distribution of Al2MgCu phase in the strip intergranular precipitates gave birth to premature cracks and the brittle fracture region. The precipitated particles coarsening also led to the deterioration of mechanical properties.

引用

页码：2273 / 2280

页数：8

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