| Grain Refinement of Hypereutectic Immiscible Cu-50Cr Alloy during Rapid Melting and Solidification Induced by High Power Density Laser Beams |
| Zhang LT(张犁天); Yu G(虞钢) ; Tian CX(田崇鑫); He XL(何秀丽); Li SX(李少霞)
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| 通讯作者 | Yu, Gang(gyu@imech.ac.cn)
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| 发表期刊 | METALS
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| 2019-05-01
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| 卷号 | 9期号:5页码:19 |
| ISSN | 2075-4701
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| 摘要 | The microstructure of hypereutectic immiscible Cu-50Cr alloy (wt%) was effectively refined and homogenized by a high power density Nd:YAG continuous laser beam (power density 10(4)-10(5) MW/m(2)). The average grain size of Cr was effectively refined from similar to 100 mu m to similar to 1 mu m, and some of the Cr particles even decreased to a few hundred nanometers. The high cooling rate (7.29 x 10(6) K/s) effectively inhibited the coarsening effect on Cr particles during liquid phase separation (LPS). The spherical Cr particles were preferably dispersed in the melt layer, and the thickness of the layer was up to similar to 150 mu m. The refinement and dispersion of the Cr phase contributed to improving the interruption capability of the Cu-Cr contacts. Compared with the untreated samples, the arc duration and the withstanding voltage of the laser surface melting (LSM) treated contacts with refined microstructure increased to 21% and 33%, respectively. The results demonstrated that the LSM method was an effective approach to optimize the microstructure of Cu-Cr alloy, which made it a promising modification method for Cu-Cr vacuum contact applications. |
| 关键词 | Cu-Cr immiscible alloy
laser surface melting (LSM)
liquid phase separation (LPS)
grain refinement
rapid solidification
interruption capability
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| DOI | 10.3390/met9050585
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| 收录类别 | SCI
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| 语种 | 英语
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| WOS记录号 | WOS:000478818700102
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| 关键词[WOS] | LIQUID-PHASE SEPARATION
; CU-CR ALLOYS
; COOLING RATE
; MICROSTRUCTURE
; COPPER
; CHROMIUM
; TRANSFORMATION
; RESISTANCE
; VOLTAGE
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| WOS研究方向 | Materials Science
; Metallurgy & Metallurgical Engineering
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| WOS类目 | Materials Science, Multidisciplinary
; Metallurgy & Metallurgical Engineering
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| 资助项目 | Chinese Academy of Sciences[yz201636]
; Beijing Municipal Commission of Science and Technology[Z181100003818015]
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| 项目资助者 | Chinese Academy of Sciences
; Beijing Municipal Commission of Science and Technology
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| 论文分区 | 二类/Q1
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| 力学所作者排名 | 1
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| RpAuthor | Yu, Gang
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/79757
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| 专题 | 先进制造工艺力学实验室
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推荐引用方式
GB/T 7714 |
Zhang LT,Yu G,Tian CX,et al. Grain Refinement of Hypereutectic Immiscible Cu-50Cr Alloy during Rapid Melting and Solidification Induced by High Power Density Laser Beams[J]. METALS,2019,9,5,:19.
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| APA |
张犁天,虞钢,田崇鑫,何秀丽,&李少霞.(2019).Grain Refinement of Hypereutectic Immiscible Cu-50Cr Alloy during Rapid Melting and Solidification Induced by High Power Density Laser Beams.METALS,9(5),19.
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| MLA |
张犁天,et al."Grain Refinement of Hypereutectic Immiscible Cu-50Cr Alloy during Rapid Melting and Solidification Induced by High Power Density Laser Beams".METALS 9.5(2019):19.
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