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Local decomposition induced by dislocation motions inside precipitates in an Al-alloy
B. Yang; Y. T. Zhou; D. Chen; X. L. Ma
2013
Source PublicationScientific Reports
ISSN2045-2322
Volume3
AbstractDislocations in crystals are linear crystallographic defects, which move in lattice when crystals are plastically deformed. Motion of a partial dislocation may remove or create stacking fault characterized with a partial of a lattice translation vector. Here we report that motion of partial dislocations inside an intermetallic compound result in a local composition deviation from its stoichiometric ratio, which cannot be depicted with any vectors of the primary crystal. Along dislocation slip bands inside the deformed Al2Cu particles, redistribution of Cu and Al atoms leads to a local decomposition and collapse of the original crystal structure. This finding demonstrates that dislocation slip may induce destabilization in complex compounds, which is fundamentally different from that in monometallic crystals. This phenomenon of chemical unmixing of initially homogeneous multicomponent solids induced by dislocation motion might also have important implications for understanding the geologic evolvement of deep-focus peridotites in the Earth.
description.department[yang, b. ; zhou, y. t. ; chen, d. ; ma, x. l.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. ; ma, xl (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, wenhua rd 72, shenyang 110016, peoples r china. ; xlma@imr.ac.cn
KeywordMechanical Attrition Treatment Severe Plastic-deformation Pearlitic Steel Cementite Microstructure Temperatures Dissolution Stress
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71622
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
B. Yang,Y. T. Zhou,D. Chen,et al. Local decomposition induced by dislocation motions inside precipitates in an Al-alloy[J]. Scientific Reports,2013,3.
APA B. Yang,Y. T. Zhou,D. Chen,&X. L. Ma.(2013).Local decomposition induced by dislocation motions inside precipitates in an Al-alloy.Scientific Reports,3.
MLA B. Yang,et al."Local decomposition induced by dislocation motions inside precipitates in an Al-alloy".Scientific Reports 3(2013).
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