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材料导报  2019, Vol. 33 Issue (2): 309-313    https://doi.org/10.11896/cldb.201902020
  金属与金属基复合材料 |
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
朱靖, 李勇, 王莹, 李焕, 赵亚茹
江西理工大学工程研究院,赣州 341000
Formation Mechanism of Band-like Structure in Cu-2.5%Cr Alloy at Various Rates of Directional Solidification
ZHU Jing, LI Yong, WANG Ying, LI Huan, ZHAO Yaru
Institute of Engineering Research, Jiangxi University of Science and Technology, Ganzhou 341000
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摘要 利用OM、SEM和EDS研究了定向凝固速度对Cu-2.5%Cr合金中带状组织形貌和成分偏析的影响,并对不同形态的带状组织的形成机制进行了分析。结果表明:在5~50 μm/s的定向凝固速率下,Cu-2.5%Cr合金会产生平界面与共晶、胞状组织与共晶、柱状树枝晶与共晶三种不同形态的带状组织。这是由于凝固速率达到了平/胞转换临界速率以及胞/枝转换临界速率。带状组织的形成伴随着大量的溶质扩散与偏析,随着定向凝固速率的增大,带状组织中成分偏析增大,且带状组织愈加清晰。
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朱靖
李勇
王莹
李焕
赵亚茹
关键词:  定向凝固  Cu-2.5%Cr合金  带状组织  凝固速率  成分偏析    
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
                    发布日期:  2019-01-31
ZTFLH:  TG146  
基金资助: 国家自然科学基金(51261007;51561007);江西省科技厅发明专利产业化重点项目(20161BBM26036);江西理工大学清江青年英才支持计划(JXUSTQJBJ2017005)
作者简介:  朱靖,2017年至今就读于江西理工大学材料科学与工程学院,攻读学术硕士学位。主要从事定向凝固技术、高强高导铜合金领域的研究。李勇,副教授,中南大学博士毕业,美国路易斯安那州立大学访问学者,硕士研究生导师,江西理工大学第二批清江拔尖人才。liyong0248@163.com
引用本文:    
朱靖, 李勇, 王莹, 李焕, 赵亚茹. 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[J]. 材料导报, 2019, 33(2): 309-313.
ZHU Jing, LI Yong, WANG Ying, LI Huan, ZHAO Yaru. Formation Mechanism of Band-like Structure in Cu-2.5%Cr Alloy at Various Rates of Directional Solidification. Materials Reports, 2019, 33(2): 309-313.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.201902020  或          http://www.mater-rep.com/CN/Y2019/V33/I2/309
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