个人信息Personal Information
教授
博士生导师
硕士生导师
性别:女
毕业院校:大连理工大学
学位:博士
所在单位:材料科学与工程学院
学科:材料物理与化学
办公地点:三束实验室2号楼302室
联系方式:0411-84708380-8302
电子邮箱:lixiaona@dlut.edu.cn
Cu-Ni-Sn-Si alloys designed by cluster-plus-glue-atom model
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论文类型:期刊论文
发表时间:2019-04-05
发表刊物:MATERIALS & DESIGN
收录刊物:SCIE、EI
卷号:167
ISSN号:0264-1275
关键字:Cu-Ni-Sn; Segregation; Discontinuous precipitation; Solidus-liquidus temperature range; High-temperature stability; Cluster model
摘要:Segregation in the solidification process and discontinuous precipitation during aging cause the service and processing performance of Cu-Ni-Sn alloys deteriorating severely. In this work, Si is added as a fourth element for the design of Cu80Ni15Sn5-xSix (x = 0, 0.625, 1.25, 1.875, 2.5) series alloys using cluster-plus-glue-atom model to solve these issues from the point of composition design. The results suggest that the introduction of Si leads to the disappearance of the lamellar structure formed in the as-cast alloys while also inhibiting discontinuous precipitation during aging. The solidus-liquidus temperature range is reduced with the addition of Si, and this strategy is most effective when the Si is in the solution state. With increasing Si content, the high-temperature conductive stability of the alloys is improved. Moreover, the hardness and conductivity of the Cu80Ni15Sn5 alloy designed by cluster-plus-glue-atom model are improved compared with those of C72900 (Cu78.96Ni16.65Sn4.39) commercial alloy, and the properties of Cu80Ni15Sn4.375Si0.625 alloy are basically equivalent to those of C72900 alloy. These findings indicate that alloys with excellent synthetic properties can be produced as long as the content and existential state of Si are reasonably controlled. (C) 2019 The Authors. Published by Elsevier Ltd.