期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 29, 期 11, 页码 2273-2280出版社
ELSEVIER
DOI: 10.1016/S1003-6326(19)65133-2
关键词
Al-Zn-Mg-Cu alloy; heat affected zone; microstructure; mechanical properties; ductile/brittle composite fracture
资金
- National Natural Science Foundation of China [51905126]
- China Postdoctoral Science Foundation-General Program [2018M641822]
- Natural Scientific Research Innovation Foundation in HIT, China [HIT.NSRIF.201703]
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.
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