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Strong crystal size effect on deformation twinning
Yu, Qian1; Shan, Zhi-Wei1,2; Sun, Jun1; Ma, Evan1; Li, Ju1,5; Huang, Xiaoxu3; Xiao, Lin4
Corresponding AuthorSun, Jun
Source PublicationNATURE

Deformation twinning(1-6) in crystals is a highly coherent inelastic shearing process that controls the mechanical behaviour of many materials, but its origin and spatio-temporal features are shrouded in mystery. Using micro-compression and in situ nano-compression experiments, here we find that the stress required for deformation twinning increases drastically with decreasing sample size of a titanium alloy single crystal(7,8), until the sample size is reduced to one micrometre, below which the deformation twinning is entirely replaced by less correlated, ordinary dislocation plasticity. Accompanying the transition in deformation mechanism, the maximum flow stress of the submicrometre-sized pillars was observed to saturate at a value close to titanium's ideal strength(9,10). We develop a 'stimulated slip' model to explain the strong size dependence of deformation twinning. The sample size in transition is relatively large and easily accessible in experiments, making our understanding of size dependence(11-17) relevant for applications.

KeywordAl single-crystAls Materials Science Metals Titanium Strength Behavior Nucleation Plasticity Dependence Maximum
WOS IDWOS:000273748100039
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Cited Times:433[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Xi An Jiao Tong Univ, CAMP Nano, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
2.Hysitron Inc, Minneapolis, MN 55344 USA
3.Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
4.Tech Univ Denmark, Riso Natl Lab Sustainable Energy, Mat Res Div, Danish Chinese Ctr Nanomet, DK-4000 Roskilde, Denmark
5.Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
Recommended Citation
GB/T 7714
Yu, Qian,Shan, Zhi-Wei,Sun, Jun,et al. Strong crystal size effect on deformation twinning[J]. NATURE,2010,463(7679):335-338.
APA Yu, Qian.,Shan, Zhi-Wei.,Sun, Jun.,Ma, Evan.,Li, Ju.,...&Xiao, Lin.(2010).Strong crystal size effect on deformation twinning.NATURE,463(7679),335-338.
MLA Yu, Qian,et al."Strong crystal size effect on deformation twinning".NATURE 463.7679(2010):335-338.
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