厚板Cu-Cr-Zr合金搅拌摩擦焊接接头沿厚度方向组织和力学性能的变化

doi:10.11896/cldb.19050063

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Abstract In this experiment, Cu-Cr-Zr alloy with a thickness of 15 mm was welded by friction stir welding (FSW). The joint with good external forming and no internal defects was obtained, and the difference of microstructures and mechanical properties of the weld were analyzed along the thickness direction. The results showed that: the microstructures of the NZ were the fine equiaxed grain, and the grain size varied little along the thickness direction. The microstructures of TMAZ were elongated by the shear force, the discrepancy of grain size along the thickness direction was larger, showed a trend of decreasing from top to bottom. The hardness distribution of the top and middle of the weld cross-section was ″W″ type, and the hardness distribution of the bottom was ″U″ type. The hardness of NZ has little difference in the thickness direction, and the diffe-rence in TMAZ of advancing side weld was the largest, which has reached 45HV, the hardness of the weld increased from top to bottom. The tensile strength of the weld increased gradually from top to bottom, while the elongation changed in the opposite direction, and the tensile strength at the bottom of the weld was up to 303 MPa, which was 80% of the base metal.

Key words： Cu-Cr-Zr alloy thick plate friction stir welding the thickness direction microstructure mechanical property

Published: 26 April 2020

CLC number:

TG40

Fund:This work was financially supported by the Key Laboratory of Advanced Welding Technology in Hubei Province (hykj-2017-037).

Corresponding Authors: Chunping Huang, associate professor, postgraduate supervisor. He is a senior member of China Mechanical Engineering Society, a member of Cladding and Surface Engineering Committee of China Welding Society, a member of Environment, Health and Safety Committee of China Welding Society, and a director and deputy secretary-general of Jiangxi Welding Society. Assessment experts of National Natural Science Foundation, Jiangxi Province and Shanxi Province. He is the reviewer of Journal of Alloys and Compounds, Materials & Design, Acta Mate-riae Compositae Sinica and Materials Reports. As the project manager, he undertook the projects of National Natural Science Foundation, Aeronautical
Science Foundation, Jiangxi Natural Science Foundation, Jiangxi Education Department Science Foundation and Key Technological Research Projects of Aviation Enterprises. More than 60 scientific papers have been published, of which more than 30 have been retrieved by SCI and EI. He was awarded the first and second prizes for scientific and technological progress in Jiangxi Province and AVIC Group Third Prize in Science and Technology.

About author:: Yiqing Qiu, engineer, master. He is mainly engaged in the research of friction stir welding. He published 3 papers and authorized 4 invention patents.

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Cite this article:

QIU Yiqing,FAN Zhunan,HUANG Chunping, et al. Variations of the Microstructure and Mechanical Properties for the Thick Plate Cu-Cr-Zr Alloy Friction Stir Welding Joint Along the Thickness Direction[J]. Materials Reports, 2020, 34(10): 10162-10165.

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http://www.mater-rep.com/EN/10.11896/cldb.19050063 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10162

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