Contribution to size effect of yield strength from the stochastics of dislocation source lengths in finite samples

Recent works show that the yield strength of metals increases steeply with decreasing sample size. In this work, it is shown that this sample size effect can be rationalized almost completely by considering the stochastics of dislocation source lengths in samples of finite size. The statistical firs...

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Bibliographic Details
Published inScripta materialia Vol. 56; no. 4; pp. 313 - 316
Main Authors Parthasarathy, Triplicane A., Rao, Satish I., Dimiduk, Dennis M., Uchic, Michael D., Trinkle, Dallas R.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2007
Subjects
Dislocation
Size
Source
Stochastics
Yield
Yield
Stochastics
Size
Source
Dislocation
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Summary:Recent works show that the yield strength of metals increases steeply with decreasing sample size. In this work, it is shown that this sample size effect can be rationalized almost completely by considering the stochastics of dislocation source lengths in samples of finite size. The statistical first and second moments of the effective source length are derived as a function of sample size. The sample strength predicted from this effective length compares well with data.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2006.09.016