A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes

Bei, Hongbin; Xia, Yuzhi; Barabash, Rozaliya; Gao, Y. F.

doi:10.1016/j.scriptamat.2015.07.043

Title: A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes

Journal Article · Mon Aug 10 00:00:00 EDT 2015 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2015.07.043 · OSTI ID:1237145

Bei, Hongbin ^[1]; Xia, Yuzhi ^[2]; Barabash, Rozaliya ^[1]; Gao, Y. F. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Pre-straining defect-free single crystals will introduce heterogeneous dislocation nucleation sources that reduce the measured strength from the theoretical value, while pre-straining bulk samples will lead to strain hardening. Their competition is investigated by nanoindentation pop-in tests on variously pre-strained Mo single crystals with several indenter radii (~micrometer). Pre-straining primarily shifts deformation mechanism from homogeneous dislocation nucleation to a stochastic behavior, while strain hardening plays a secondary role, as summarized in a master plot of pop-in strength versus normalized indenter radius.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1237145

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 110; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (22)

Independence of Slip Velocities on Applied Stress in Small Crystals Maaß, R.; Derlet, P. M.; Greer, J. R. Small, Vol. 11, Issue 3 https://doi.org/10.1002/smll.201400849	journal	September 2014
Indentation-induced localized deformation and elastic strain partitioning in composites at submicron length scale Barabash, R. I.; Bei, H.; Gao, Y. F. Acta Materialia, Vol. 58, Issue 20 https://doi.org/10.1016/j.actamat.2010.09.004	journal	December 2010
Variability in the yield strength of a metallic glass at micron and submicron length scales Bharathula, Ashwini; Flores, Katharine M. Acta Materialia, Vol. 59, Issue 19 https://doi.org/10.1016/j.actamat.2011.08.008	journal	November 2011
In situ measurements of a homogeneous to heterogeneous transition in the plastic response of ion-irradiated 〈1 1 1〉 Ni microspecimens Zhao, Xinyu; Strickland, Daniel J.; Derlet, Peter M. Acta Materialia, Vol. 88 https://doi.org/10.1016/j.actamat.2015.01.007	journal	April 2015
Indentation Schmid factor and orientation dependence of nanoindentation pop-in behavior of NiAl single crystals Li, T. L.; Gao, Y. F.; Bei, H. Journal of the Mechanics and Physics of Solids, Vol. 59, Issue 6 https://doi.org/10.1016/j.jmps.2011.04.003	journal	June 2011
FIB damage of Cu and possible consequences for miniaturized mechanical tests Kiener, D.; Motz, C.; Rester, M. Materials Science and Engineering: A, Vol. 459, Issue 1-2 https://doi.org/10.1016/j.msea.2007.01.046	journal	June 2007
Multidimensional contact moduli of elastically anisotropic solids Gao, Y. F.; Pharr, G. M. Scripta Materialia, Vol. 57, Issue 1 https://doi.org/10.1016/j.scriptamat.2007.03.020	journal	July 2007
Interface strength in NiAl–Mo composites from 3-D X-ray microdiffraction Barabash, R. I.; Bei, H.; Gao, Y. F. Scripta Materialia, Vol. 64, Issue 9 https://doi.org/10.1016/j.scriptamat.2011.01.028	journal	May 2011
Estimation of the shear transformation zone size in a bulk metallic glass through statistical analysis of the first pop-in stresses during spherical nanoindentation Choi, In-Chul; Zhao, Yakai; Yoo, Byung-Gil Scripta Materialia, Vol. 66, Issue 11 https://doi.org/10.1016/j.scriptamat.2012.02.032	journal	June 2012
Tensile Strength of Whiskers Brenner, S. S. Journal of Applied Physics, Vol. 27, Issue 12 https://doi.org/10.1063/1.1722294	journal	December 1956
Plastic Deformation of Copper and Silver Whiskers Brenner, S. S. Journal of Applied Physics, Vol. 28, Issue 9 https://doi.org/10.1063/1.1722900	journal	September 1957
Structural heterogeneity induced plasticity in bulk metallic glasses: From well-relaxed fragile glass to metal-like behavior Li, Weidong; Bei, H.; Tong, Y. Applied Physics Letters, Vol. 103, Issue 17 https://doi.org/10.1063/1.4827299	journal	October 2013
Yield strength dependence on strain rate of molybdenum-alloy nanofibers Loya, P. E.; Xia, Y. Z.; Peng, C. Applied Physics Letters, Vol. 104, Issue 25 https://doi.org/10.1063/1.4885377	journal	June 2014
The effect of the indenter load on the nanohardness of ductile metals: An experimental study on polycrystalline work-hardened and annealed oxygen-free copper Lim, Yong Yee; Chaudhri, M. Munawar Philosophical Magazine A, Vol. 79, Issue 12 https://doi.org/10.1080/01418619908212037	journal	December 1999
Strength differences arising from homogeneous versus heterogeneous dislocation nucleation Bei, H.; Gao, Y. F.; Shim, S. Physical Review B, Vol. 77, Issue 6 https://doi.org/10.1103/PhysRevB.77.060103	journal	February 2008
Size Effects and Stochastic Behavior of Nanoindentation Pop In Morris, J. R.; Bei, H.; Pharr, G. M. Physical Review Letters, Vol. 106, Issue 16 https://doi.org/10.1103/PhysRevLett.106.165502	journal	April 2011
Sample Dimensions Influence Strength and Crystal Plasticity Uchic, M. D. Science, Vol. 305, Issue 5686 https://doi.org/10.1126/science.1098993	journal	August 2004
The Indentation Size Effect: A Critical Examination of Experimental Observations and Mechanistic Interpretations Pharr, George M.; Herbert, Erik G.; Gao, Yanfei Annual Review of Materials Research, Vol. 40, Issue 1 https://doi.org/10.1146/annurev-matsci-070909-104456	journal	June 2010
Scale effects in convoluted thermal/spatial statistics of plasticity initiation in small stressed volumes during nanoindentation Li, T. L.; Bei, H.; Morris, J. R. Materials Science and Technology, Vol. 28, Issue 9-10 https://doi.org/10.1179/1743284712Y.0000000007	journal	October 2012
Application of nucleation theory to the rate dependence of incipient plasticity during nanoindentation Schuh, Christopher A.; Lund, Alan C. Journal of Materials Research, Vol. 19, Issue 7 https://doi.org/10.1557/JMR.2004.0276	journal	July 2004
3D x-ray microprobe investigation of local dislocation densities and elastic strain gradients in a NiAl-Mo composite and exposed Mo micropillars as a function of prestrain Barabash, Rozaliya I.; Bei, Hongbin; Gao, Yanfei Journal of Materials Research, Vol. 25, Issue 2 https://doi.org/10.1557/JMR.2010.0043	journal	February 2010
Effects of machine stiffness on the loading–displacement curve during spherical nano-indentation Li, Weidong; Bei, Hongbin; Qu, Jun Journal of Materials Research, Vol. 28, Issue 14 https://doi.org/10.1557/jmr.2013.164	journal	June 2013

Cited By (2)

Single versus successive pop-in modes in nanoindentation tests of single crystals Xia, Yuzhi; Gao, Yanfei; Pharr, George M. Journal of Materials Research, Vol. 31, Issue 14 https://doi.org/10.1557/jmr.2016.193	journal	May 2016
Bending Nanoindentation and Plasticity Noise in FCC Single and Polycrystals Bolin, Ryder; Yavas, Hakan; Song, Hengxu Crystals, Vol. 9, Issue 12 https://doi.org/10.3390/cryst9120652	journal	December 2019

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Title: A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes

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