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Atomistic simulations on orientation dependent martensitic transformation during nanoindentation of NiTi shape-memory alloys

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Abstract
Unusual orientation-dependent mechanical responses during nanoindentations of nickel-titanium shape-memory alloys are studied by performing a series of large-scale molecular dynamics simulations. By analyzing the mechanical responses of single crystal nickel-titanium shape-memory alloys during indentations along [1 1 1] and [0 0 1] directions, the present study provides direct supporting results emphasizing the importance of the anisotropy in the martensite formation. The microstructural evolution, especially for the martensitic transformation beneath the indenter tip, is clearly visualized and directly related to the indentation load-depth curves and the surface profile. The results show that the reported orientation-dependency of the indentation load-depth curves is decisively driven by the anisotropy in the preferred growth direction of the martensite phase and the amount of the martensite phase formed beneath the indenter tip.
Author(s)
고원석Jong Bae Jeon
Issued Date
2021
Type
Article
Keyword
Shape-memory alloysNickel-titaniumNanoindentationPhase transformationMolecular dynamics
DOI
10.1016/j.commatsci.2020.110127
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8958
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_elsevier_sciencedirect_doi_10_1016_j_commatsci_2020_110127&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Atomistic%20simulations%20on%20orientation%20dependent%20martensitic%20transformation%20during%20nanoindentation%20of%20NiTi%20shape-memory%20alloys&offset=0&pcAvailability=true
Publisher
COMPUTATIONAL MATERIALS SCIENCE
Location
네덜란드
Language
영어
ISSN
0927-0256
Citation Volume
187
Citation Number
1
Citation Start Page
110127
Citation End Page
110127
Appears in Collections:
Engineering > Material Engineering
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