摘要
采用双模晶体相场法研究六方相向正方相的转变。分别针对倾侧角为0°、15°、30°和45°,晶粒取向差为6°的六方相体系做了研究。结果表明:六方晶粒长大、溶合、并形成共格晶界,位错组沿六方晶界均匀分布,并有2种取向。正方相在位错组处形核,并且其取向取决于位错组取向。每一种倾侧角的体系中均形成2个取向正方相的变体。针对倾侧角为0°、15°、30°和45°的六方相体系,生成的四方相相变体之间的取向差分别为30°、30°、10°和5°。不同取向的正方相晶粒长大熟化的方式有差异,位于有利取向的晶粒将会优先生长并占据主导地位。以共格晶界形式长大的晶粒,晶界处有位错组生成以松弛晶粒长大的应力集中。
A two-mode phase field crystal(PFC)method was employed to focus on hexagonal to square phase transformation.Hexagonal phase with a misorientation of 6°and a tilt angle of 0°,15°,30°,and 45°were investigated.Results show that the hexagonal grains grow up,coalesce and form coherent grain boundaries with dislocation sets in two orientations.Square phases nucleate on these dislocation sets and their orientations are determined by dislocation sets.These square grains have two variants at each tilt angle,and the misorientations are 30°,30°,10°,and 5°when tilt angles are 0°,15°,30°,and 45°,respectively.Square grains with different orientations grow and ripen in different paces,and the grains located in preferential orientation will dominate.Dislocation sets are generated to relieve strain concentration that rises from grain growth in coherent boundaries.
作者
吴璐
潘荣剑
张伟
陈铮
王贺然
张静
Wu Lu;Pan Rongjian;Zhang Wei;Chen Zheng;Wang Heran;Zhang Jing(The First Sub-institute,Nuclear Power Institute of China,Chengdu 610005,China;National Key Laboratory for Nuclear Fuel and Material,Nuclear Power Institute of China,Chengdu 610041,China;School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第12期4103-4111,共9页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51601185,51704243,51674205)
Defense Industrial Technology Development Program(JCKY2017201C016)
China Postdoctoral Science Foundation(2015M582575)
National Key Research and Development Program of China(2016YFB07001)。
关键词
晶界
位错组
正方相变体
相变
晶体相场
grain boundaries
dislocation sets
square variants
phase transformation
phase field crystal
