| 引用本文: | 吴小盼,张伟强,付华萌,蓝国民.异种高熵合金CuCoCrFeNi和AlCoCrFeNi的激光焊接头组织和性能研究[J].材料科学与工艺,2017,25(4):25-30.DOI:10.11951/j.issn.1005-0299.20160304. |
| WU Xiaopan,ZHANG Weiqiang,FU Huameng,LAN Guomin.Study on microstructure and properties of laser welded joint of dissimilar high entropy alloy CuCoCrFeNi and AlCoCrFeNi[J].Materials Science and Technology,2017,25(4):25-30.DOI:10.11951/j.issn.1005-0299.20160304. |
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| 摘要: |
| 为开展异种高熵合金激光焊接性研究，采用光纤激光对1.2 mm厚的异种高熵合金CuCoCrFeNi和AlCoCrFeNi实施了对接焊试验，利用金相观察、EDS、XRD和显微硬度计等方法对接头组织和性能进行测试.研究表明：在经历焊接热循环后，HAZ的金相组织没有发生明显变化；在FZ附近发现两种不同类型的显微组织(柱状晶和胞状晶)，WM中心区由等轴晶组成；WM区内各元素均匀分布，FZ附近区域焊缝晶界处存在Cu、Al元素的偏聚，与母材相比，该偏聚现象明显减弱；焊缝横截面的显微硬度略高于CuCoCrFeNi合金，远低于AlCoCrFeNi合金；异种接头拉伸试样断裂位置发生在AlCoCrFeNi合金母材处，接头的抗拉强度σb为166 MPa，断口形式为解理断裂，其断口形貌为扇形花样与河流状花样(无撕裂棱).与母材组织相比，焊缝区晶粒明显细化，且焊缝仍为高熵合金.
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| 关键词: 高熵合金 激光焊接 对接焊 组织 性能 |
| DOI：10.11951/j.issn.1005-0299.20160304 |
| 分类号:TG456.7 |
| 文献标识码:A |
| 基金项目:国家重点基础研究发展计划(973计划)资助项目(2011CB610405). |
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| Study on microstructure and properties of laser welded joint of dissimilar high entropy alloy CuCoCrFeNi and AlCoCrFeNi |
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WU Xiaopan1, ZHANG Weiqiang1, FU Huameng2, LAN Guomin3
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(1.School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China; 2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 3.Shenzhen HAN′s Laser Technology Company Limited, Shenzhen 518103, China)
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| Abstract: |
| To carry out laser welding of different high entropy alloy research, dissimilar high entropy alloy CuCoCrFeNi and AlCoCrFeNi with 1.2 mm thickness were welded by fiber laser butt welding. The microstructure and mechanical property of welded joint were investigated by metallographic observation, energy dispersive spectrometry (EDS), X-ray diffraction (XRD) and Micro hardness tester and so on. The results indicate that: after welding thermal cycle, the microstructure of HAZ had no obvious change; two different types of microstructure were found in the vicinity of FZ (columnar crystal and cellular crystal), WM center area is composed of equiaxed grains; the element distribution in the weld zone is uniform, Cu element and Al element are rich in the weld grain boundary of near FZ areas.And compared with the base metal, which is obviously weakened. The micro hardness of the cross section of the weld is slightly higher than that of the CuCoCrFeNi alloy, but much lower than that of the AlCoCrFeNi alloy. The fracture position of the tensile specimen of the dissimilar welded joint occurs in the AlCoCrFeNi alloy. The tensile strength σb of welded joint is 166 MPa. The mechanism of welded joint is cleavage fracture, because the fracture morphology is fan-shaped patterns and river-shaped patterns which tear ridges can't be observed from river-shaped patterns.
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| Key words: high-entropy alloy laser welding butt welding microstructure properties |
