Formation of prismatic dislocation loops during unloading in nanoindentation

[Display omitted] The formation of prismatic dislocation loops during nanoindentation of bcc iron is simulated with discrete dislocation plasticity. Interestingly, it is not the loading phase, but the unloading phase of the test which is found to be crucial for prismatic loop formation when indentin...

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Bibliographic Details
Published inScripta materialia Vol. 189; pp. 112 - 116
Main Authors Yu, Haiyang, Cocks, Alan  C.  F., Tarleton, Edmund
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2020
Subjects
Discrete dislocation dynamics
Nanoindentation
Prismatic loops
Prismatic loops
Discrete dislocation dynamics
Nanoindentation
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Summary:[Display omitted] The formation of prismatic dislocation loops during nanoindentation of bcc iron is simulated with discrete dislocation plasticity. Interestingly, it is not the loading phase, but the unloading phase of the test which is found to be crucial for prismatic loop formation when indenting a (001) crystal surface. In this case, prismatic loops do not form during loading, but develop as the indenter is removed, in contrast to (111) indentation where prismatic loops are nucleated almost immediately upon loading.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.07.062