不同定向凝固速率下Cu-2.5%Cr合金中带状组织的形成机理

doi:10.11896/cldb.201902020

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Abstract The impact of directional solidification rate on the morphology and composition segregation of band-like structures in Cu-2.5%Cr alloy were investigated by means of OM, SEM and EDS. The formation mechanism of band-like structures with diverse morphology was analyzed as well. The results showed that three different forms of band-like structures including: flat interface and eutectic, cell structure and eutectic, columnar dendrites and eutectic would be generated in the Cu-2.5%Cr alloy, at the directional solidification rates of 5—50 m/s. This was because the solidification rate reached the critical rate of flat/cell transition and the critical rate of cell/branch transition. The formation of band-like structure was accompanied by a large amount of solute diffusion and segregation. With the increase of directional solidification rate, the segregation of band-structure was enhanced, and the band-like structure became more distinct.

Key words： directional solidification Cu-2.5%Cr alloy banded-like structure solidification rate component segregation

Published: 31 January 2019

CLC number:

TG146

Fund:This work was financially supported by the Natural Science Foundation of China (51261007,51561007), the Invention Patent Industrialization Project of Jiangxi Science and Technology Office (20161BBM26036), the Qingjiang Youth Support Scheme Funding of Jiangxi University of Science and Technology (JXUSTQJBT2017005).

About author:: Jing Zhu has studied in the School of Materials Science and Engineering, Jiangxi University of Science and Technology since 2017, to pursue his master's degree. His main research fields are directional solidification technology and high strength and high conductivity copper alloy field.Yong Li, Associate Professor, Ph.D., graduated from Central South University, Visiting Scholar of Louisiana State University, Master's Supervisor, and the second Qingjiang batch of top talents from Jiangxi University of Science and Technology. His main research interests are copper matrix composites and lithium ion battery anode materials. He has published more than 50 academic papers in important academic journals both at home and abroad. He chaired 2 National Natural Science Foundation and chaired 4 provincial and ministerial level scientific research projects. He applied for 11 patents and authorized 10.

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Cite this article:

ZHU Jing,LI Yong,WANG Ying, et al. Formation Mechanism of Band-like Structure in Cu-2.5%Cr Alloy at Various Rates of Directional Solidification[J]. Materials Reports, 2019, 33(2): 309-313.

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http://www.mater-rep.com/EN/10.11896/cldb.201902020 OR http://www.mater-rep.com/EN/Y2019/V33/I2/309

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