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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)
Corresponding AuthorYu, Gang(gyu@imech.ac.cn)
Source PublicationMETALS
2019-05-01
Volume9Issue:5Pages:19
ISSN2075-4701
AbstractThe 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.
KeywordCu-Cr immiscible alloy laser surface melting (LSM) liquid phase separation (LPS) grain refinement rapid solidification interruption capability
DOI10.3390/met9050585
Indexed BySCI
Language英语
WOS IDWOS:000478818700102
WOS KeywordLIQUID-PHASE SEPARATION ; CU-CR ALLOYS ; COOLING RATE ; MICROSTRUCTURE ; COPPER ; CHROMIUM ; TRANSFORMATION ; RESISTANCE ; VOLTAGE
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding ProjectChinese Academy of Sciences[yz201636] ; Beijing Municipal Commission of Science and Technology[Z181100003818015]
Funding OrganizationChinese Academy of Sciences ; Beijing Municipal Commission of Science and Technology
Classification二类/Q1
Ranking1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79758
Collection先进制造工艺力学重点实验室
Recommended Citation
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.
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.
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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