首页|Al-20％Cu多晶粒竞争生长的原位观测及汇聚型枝晶淘汰模型构建

Al-20％Cu多晶粒竞争生长的原位观测及汇聚型枝晶淘汰模型构建

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
采用同步辐射成像技术研究Al-20％Cu(质量分数)亚共晶合金的晶粒竞争生长动力学,并建立与实验结果相一致的数学模型.结果表明,对于发散型竞争生长,遵循"正常淘汰"规则.对于汇聚型竞争生长,成分过冷的作用加速非择优取向晶粒中一次枝晶臂的生长速度,导致非择优取向枝晶出现"异常淘汰"现象,淘汰择优取向枝晶.探讨汇聚型竞争生长的"正常淘汰"与"异常淘汰"之间的临界条件,建立枝晶生长速率、枝晶臂间距和枝晶倾斜角之间的数学关系,又称"二次枝晶臂阻挡模型",可以快速预测晶界位相和淘汰类型.
In situ observation of multi-grain competitive growth in Al-20wt.％Cu and establishment of converging-case dendrite elimination model
Synchrotron radiography was performed during the solidification of Al-20wt.％Cu hypoeutectic alloy to study the competitive grain growth dynamics and a mathematical model consistent with the experimental results was established.The experimental results showed that for the diverging competitive growth,the"normal elimination"rule played a role.For converging competitive growth,the growth rate of the primary dendrite arms in the non-preferentially oriented grains was accelerated due to constitutional supercooling,resulting in the phenomenon of"abnormal elimination"in which the non-preferentially oriented dendrites would eliminate the preferentially oriented dendrites.The critical conditions between"normal elimination"and"abnormal elimination"of converging competitive growth were explored using a mathematical model.The mathematical model named the"secondary dendrite arm blocking model"among dendrite growth rate,dendrite arm spacing and dendrite inclination angle was established,which could quickly predict the orientation of grain boundaries and the type of elimination.

competitive growthsynchrotron radiographydirectional solidificationmathematical modelAl-Cu alloys

李发国、周莲、谢玉、张佼、Mike DODGE、尹付成、孙宝德

展开 >

湘潭大学材料科学与工程学院湖南省材料设计与制备技术重点实验室,湘潭 411105

宝山钢铁有限公司中央研究院,上海 201900

上海交通大学材料科学与工程学院,上海 200240

TWI Ltd,Granta Park,Great Abington,Cambridge CB21 6AL,UK

展开 >

竞争生长 同步辐射成像 定向凝固 数学模型 Al-Cu合金

Natural Science Foundation of Hunan Province,ChinaScience and Technology Project of Education Department of Hunan Province,ChinaNational Natural Science Foundation of ChinaXiangtan University Scientific Research Startup Fund

2021JJ3067222A010051627802

2024

10.1016/S1003-6326(24)66527-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(7)