材料科学与工程学报2018，Vol.36Issue(2)：311-315,262,6.DOI:10.14136/j.cnki.issn1673-2812.2018.02.028
裂纹位置对含铌γ-TiAl合金裂纹扩展影响的分子动力学模拟
Dynamics Simulation of Crack Propagation Influenced by Crack Location in Nb Added γ-TiAl Alloy
摘要
Abstract
By the molecular dynamics method,influence of crack locations on the crack propagation is studied in atomic scale level.The atomic trajectory figures and energy evolution figures have been obtained by the simulation of a center crack and a boundary crack on a crystal structure model of the γ-TiAl alloy.The analysis of influence that varied location has on energy and stress-strain of γ-TiAl alloy containing 3% Nb indicates that no stress concentration was found in the single crystal γ-TiAl with a center crack on the first stage of tensing;then holds are generated due to breach of atomic bonds,w hich will restrain the crack propagation,as a result crack propagating needs to overcome more obstruction.The boundary cracks rather than the center cracks will contribute more to the break of γ-TiAl alloy containing 3% Nb.关键词
裂纹位置/铌/γ-TiAl合金/分子动力学/裂纹扩展Key words
crack location/niobium/γ-TiAl alloy/molecular dynamics/crack propagation分类
矿业与冶金引用本文复制引用
芮执元,杨利,孙杰锋,剡昌锋..裂纹位置对含铌γ-TiAl合金裂纹扩展影响的分子动力学模拟[J].材料科学与工程学报,2018,36(2):311-315,262,6.基金项目
国家自然科学基金资助项目(51065014),甘肃省自然科学基金资助项目(148RJZA008),甘肃省高等学校科研资助项目(2014A-033) （51065014）
