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个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职：研究生院常务副院长
其他任职：辽宁省凝固控制与数字化制备技术重点实验室主任
性别：男
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：材料加工工程
办公地点：研究生院；材料科学与工程学院
联系方式：tmwang@dlut.edu.cn
电子邮箱：tmwang@dlut.edu.cn
In situ study on secondary dendrite arm coarsening of Sn-Bi alloy by synchrotron microradiography
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论文类型：期刊论文
发表时间：2011-04-01
发表刊物：MATERIALS RESEARCH INNOVATIONS
收录刊物：Scopus、SCIE、EI
卷号：15
期号：2
页面范围：156-159
ISSN号：1432-8917
关键字：Dendritic growth; Coarsening mechanism; Synchrotron radiation; Metals and alloys
摘要：Synchrotron microradiography technique was applied in situ to observe the evolution of dendrite morphology of Sn-Bi alloy during solidification at controlled cooling rates. It is shown by in situ observations that different coarsening mechanisms of secondary dendrite arm might operate under different cooling conditions or solidification stages. Coarsening mainly occurred in the early solidification stage due to the competition of secondary dendrite arms, and therefore, secondary dendrite arm spacing is mainly determined in this stage. Coalescence was the dominant coarsening mechanism in the late solidification stage. In particular, at lower cooling rate, e. g. 1.5 K min(-1), dendrite fragmentation frequently occurred, and played an important role in dendrite coarsening. The real time observations in real alloy provide verification of the dendrite arm coarsening models.