学位：博士
职称：教授
所在单位：材料科学与工程学院
长期从事金属材料蠕变、组织演化、损伤及寿命预测工作。主持和参加国家自然科学基金重点和面上项目6项，“863”计划课题2项，省部级及企业项目20余项。获国家发明专利5项，发表学术论文200余篇。出版专著“耐热钢持久性能的统计分析及可靠性预测”1部（科学出版社），译著“高温合金”1部，编著1部。获辽宁省教学名师，宝钢教育奖优秀教师奖。辽宁省教学成果一等奖1项，国家本科一流课程、国家精品在线开放课程负责人。Emerald出版社颁发的学术奖“Literati Club Awards for Excellence”，金属学报2009-2015年度优秀论文奖。省部级科技奖励一等奖、二等奖5项。
Strain-induced transformation between vacancy voids and stacking fault tetrahedra in Cu
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论文类型：期刊论文
发表时间：2019-02-15
发表刊物：COMPUTATIONAL MATERIALS SCIENCE
收录刊物：SCIE、Scopus
卷号：158
页面范围：359-368
ISSN号：0927-0256
关键字：Molecular dynamics; Atomistic simulation; Vacancy cluster; Stacking fault tetrahedra; Volumetric strain
摘要：The transformation between voids and stacking fault tetrahedra (SFTs) under volumetric strain has been systematically investigated by atomistic computer simulation. It has been found out that equiaxial voids or SFTs have high stability under tensile or compressive strain. Molecular dynamic simulations show that the SFTs can transform to voids even at extremely low temperature under constant tensile strain. On the contrary, the equiaxial voids can transform to SFTs under constant compressive strain. The voids and SFTs can also transform to each other under cycling strain. During the transformation from SFTs to voids, four atoms at the vertex of SFT move outward first. Then, the {1 1 1} plane atoms move by layers toward one of the vertices. Finally, the opposing {1 1 1} plane atoms move toward the opposite direction, thereby forming planar voids. The planar voids transform to SFT through the opposite process. This strain-induced transformation is remarkably affected by temperature and strain rate. High temperature can advance the strain of the transformation, while the strain rate exerts opposite effects.
发表时间：2019-02-15
