Variations of the Microstructure and Mechanical Properties for the Thick Plate Cu-Cr-Zr Alloy Friction Stir Welding Joint Along the Thickness Direction
QIU Yiqing1,2, FAN Zhunan3, HUANG Chunping3, LI Baohua1,2, TANG Zhongmin1,2
1 Key Laboratory of Advanced Welding Technology, Xiaogan 432100, China 2 Hubei Sanjiang Aerospace Hongyang Electromechanical Co., Ltd, Xiaogan 432100, China 3 National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
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.
通讯作者:
黄春平,副教授,硕士研究生导师。中国机械工程学会高级会员、中国焊接学会堆焊及表面工程专业委员会委员、中国焊接学会环境健康与安全专业委员会委员、江西省焊接学会理事兼副秘书长。为Journal of Alloys and Compounds、Materials & Design、《复合材料学报》《材料导报》等杂志的审稿人。作为项目负责人承担了国家自然科学基金、航空科学基金、江西省自然科学基金、江西省教育厅科学基金和航空企业科技攻关项目等项目,发表了60余篇科技论文,其中SCI、EI检索30余篇。曾获江西省科技进步一等奖、二等奖和中航集团科学技术三等奖。cphuang@nchu.edu.cn
作者简介: 仇一卿,工程师,硕士。主要从事搅拌摩擦焊工艺研究,发表论文3篇,授权发明专利4项。
引用本文:
仇一卿, 范祝男, 黄春平, 李宝华, 唐众民. 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[J]. 材料导报, 2020, 34(10): 10162-10165.
QIU Yiqing, FAN Zhunan, HUANG Chunping, LI Baohua, TANG Zhongmin. Variations of the Microstructure and Mechanical Properties for the Thick Plate Cu-Cr-Zr Alloy Friction Stir Welding Joint Along the Thickness Direction. Materials Reports, 2020, 34(10): 10162-10165.
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2020, Vol. 34 
