首页|Microstructure Characteristics of Super-Eutectic Zn-AI Alloy Plate Joints Welded by Pulse Fiber Laser

Microstructure Characteristics of Super-Eutectic Zn-AI Alloy Plate Joints Welded by Pulse Fiber Laser

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In this study,we present the experimental laser welding of super-eutectic Zn-A1 (ZA) alloy.Microstructure characteristics of the ZA alloy's bond area welded by pulsed laser were investigated using an optical microscope,scanning electron microscope,energy diffraction spectrum and X-Ray diffraction.The results showed that the microstructures in the weld mainly consisted of threadlike columnar crystals,coarse dendrites and fine equiaxed grains.Secondary particles were produced in the interdendritic zones due to the composition segregation.A poor A1 area was formed in η grain inside while a rich Al area took shape outside the η grain.The occurrence of the composition segregation increased the grain boundary cracking tendency.The existence of a large number of η phases greatly increased the brittle of this material.The presence of many cleavage steps in the fractograph principally depended on the secondary cleavage effect between two cleavage cracks in different planes.The evolution of cracks along the twinning plane was the result of the secondary cleavage substituting for the twinning deformation in the vicinity of the crack tip.

ZA alloylaser weldingmicrostructurecomposition segregationsecondary cleavage effect

TAO Junhui、WANG Jiakai、JIANG Kai、DAI Wei、LI Jie、WU Tian

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School of Physics and Mechanical & Electronical Engineering, Hubei University of Education, Wuhan 430205,Hubei, China

School of Materials Science and Engineering, Hubei University, Wuhan 430062, Hubei, China

School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China

Supported by the National Natural Science Foundation of ChinaNatural Science Foundation of Hubei ProvinceMajor Project of Technological Innovationand College Outstanding Young Scientific and Technological Innovation Team of Hubei Province

518010572018CFB2962016AAA038T201620

2020

武汉大学自然科学学报(英文版)
武汉大学

武汉大学自然科学学报(英文版)

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影响因子：0.066
ISSN：1007-1202
年,卷(期)：2020.25(1)
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