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MD simulations of loading rate dependence of detwinning deformation in nanocrystalline Ni
Su H(宿昊); Tang QH(汤奇恒); Tang, QH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
2013-03
Volume56Issue:3Pages:491-497
ISSN1674-7348
AbstractMolecular dynamics simulations are performed to investigate the deformation behavior of nanocrystalline Ni with pre-twin atom structure. The simulation sample is composed of four grains with average size 12 nm. The simulation technique of isobaric-isothermal ensemble (NPT) with high pressure is applied to obtain a sample with two circle twins. Under uniaxial tensile and shear loading, as well as different detwinning deformation behaviors are observed. Under uniaxial tension the detwinning deformation is induced by the event of grain growth, and it is supported by local energy analysis. Under the shear loading the detwinning deformation is related to the loading rate. The results show that there may be a critical shear rate. As the shear rate is sufficiently high the circle twin is found to be failed; as the shear rate is less than that rate, the size of circle twin become smaller and gradually approach a constant value. Our simulation results are in good agreement with experiment observation.
KeywordMolecular Dynamics Simulation Detwinning Loading Rate
Subject Area损伤、破坏机理和微结构演化
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000314912300002
Funding OrganizationNational Natural Science Foundation of China [11021262, 11172303, 11132011]; National Basic Research Program of China [2012CB937500]
DepartmentLNM固体物理力学
Classification二类/Q3
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47116
Collection非线性力学国家重点实验室
Corresponding AuthorTang, QH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Su H,Tang QH,Tang, QH . MD simulations of loading rate dependence of detwinning deformation in nanocrystalline Ni[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2013,56(3):491-497.
APA Su H,Tang QH,&Tang, QH .(2013).MD simulations of loading rate dependence of detwinning deformation in nanocrystalline Ni.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,56(3),491-497.
MLA Su H,et al."MD simulations of loading rate dependence of detwinning deformation in nanocrystalline Ni".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 56.3(2013):491-497.
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