郭恩宇

个人信息Personal Information

教授

博士生导师

硕士生导师

任职 : 大连理工大学宁波研究院

性别:男

毕业院校:清华大学

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:辽宁省凝固控制与数字化制备技术重点实验室/大连理工大学铸造中心401

联系方式:0411-84709500

电子邮箱:eyguo@dlut.edu.cn

扫描关注

论文成果

当前位置: 中文主页 >> 科学研究 >> 论文成果

In-situ observation of grain refinement dynamics of hypoeutectic Al-Si alloy inoculated by Al-Ti-Nb-B alloy

点击次数:

论文类型:期刊论文

发表时间:2020-12-29

发表刊物:SCRIPTA MATERIALIA

卷号:187

页面范围:142-147

ISSN号:1359-6462

关键字:Al-Si casting alloy; X-ray radiography; Grain refinement; Al-Ti-Nb-B; heterogeneous nucleation

摘要:The grain refining behaviour of a novel Al-Ti-Nb-B alloy in Al-Si melt with low cooling rate was in-situ observed by synchrotron radiography. Nucleation and growth of alpha-Al dendrites in the near-isothermal Al-8Si-7Cu melts inoculated by Al-1.67Ti-3.33Nb-0.5B and Al-5Ti-1B and were investigated. The evolution of grain number density and dendrite growth rate of alpha-Al were quantitatively studied, with which the significant difference in nucleation potencies between TiB2 and (Ti,Nb)B-2 in Al-Si melt was understood. The superior grain refining efficacy of the Al-1.67Ti-3.33Nb-0.5B alloy owes to the sufficient amount of (Ti,Nb)B-2 particles potent for both epitaxial nucleation and free growth. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.