Constitutive modeling of strain rate effects in nanocrystalline and ultrafine grained polycrystals
作者： Ercan Gürses , Tamer El Sayed
DOI: 10.1016/J.IJSOLSTR.2011.02.013
关键词:
摘要: We present a variational two-phase constitutive model capable of capturing the enhanced rate sensitivity in nanocrystalline (nc) and ultrafine-grained (ufg) fcc metals. The nc/ufg-material consists grain interior phase boundary affected zone (GBAZ). behavior GBAZ is described by rate-dependent isotropic porous plasticity model, whereas rate-independent crystal-plasticity which accounts for transition from partial dislocation to full mediated employed interior. scale bridging single polycrystal done Taylor-type homogenization. It shown that caused size refinement successfully captured proposed model.
elsevier.com
tpbin.com 参考文章(53)
Ramesh K. Guduru, K. Linga Murty, Khaled M. Youssef, Ronald O. Scattergood, Carl C. Koch, Mechanical behavior of nanocrystalline copper Materials Science and Engineering A-structural Materials Properties Microstructure and Processing. ,vol. 463, pp. 14- 21 ,(2007) , 10.1016/J.MSEA.2006.07.165
Yujie Wei, Huajian Gao, An elastic–viscoplastic model of deformation in nanocrystalline metals based on coupled mechanisms in grain boundaries and grain interiors Materials Science and Engineering A-structural Materials Properties Microstructure and Processing. ,vol. 478, pp. 16- 25 ,(2008) , 10.1016/J.MSEA.2007.05.054
G.W. Nieman, J.R. Weertman, R.W. Siegel, Mechanical behavior of nanocrystalline metals Nanostructured Materials. ,vol. 1, pp. 185- 190 ,(1992) , 10.1016/0965-9773(92)90074-8
Q Wei, S Cheng, K.T Ramesh, E Ma, Effect of nanocrystalline and ultrafine grain sizes on the strain rate sensitivity and activation volume: fcc versus bcc metals Materials Science and Engineering A-structural Materials Properties Microstructure and Processing. ,vol. 381, pp. 71- 79 ,(2004) , 10.1016/J.MSEA.2004.03.064
T.D. Shen, C.C. Koch, T.Y. Tsui, G.M. Pharr, ON THE ELASTIC MODULI OF NANOCRYSTALLINE FE, CU, NI, AND CU-NI ALLOYS PREPARED BY MECHANICAL MILLING/ALLOYING Journal of Materials Research. ,vol. 10, pp. 2892- 2896 ,(1995) , 10.1557/JMR.1995.2892
S CHENG, E MA, Y WANG, L KECSKES, K YOUSSEF, C KOCH, U TROCIEWITZ, K HAN, Tensile properties of in situ consolidated nanocrystalline Cu Acta Materialia. ,vol. 53, pp. 1521- 1533 ,(2005) , 10.1016/J.ACTAMAT.2004.12.005
L. Lu, R. Schwaiger, Z.W. Shan, M. Dao, K. Lu, S. Suresh, Nano-sized twins induce high rate sensitivity of flow stress in pure copper Acta Materialia. ,vol. 53, pp. 2169- 2179 ,(2005) , 10.1016/J.ACTAMAT.2005.01.031
R Schwaiger, B Moser, M Dao, N Chollacoop, S Suresh, Some critical experiments on the strain-rate sensitivity of nanocrystalline nickel Acta Materialia. ,vol. 51, pp. 5159- 5172 ,(2003) , 10.1016/S1359-6454(03)00365-3
M. Ortiz, L. Stainier, The variational formulation of viscoplastic constitutive updates Computer Methods in Applied Mechanics and Engineering. ,vol. 171, pp. 419- 444 ,(1999) , 10.1016/S0045-7825(98)00219-9
J. Chen, L. Lu, K. Lu, Hardness and strain rate sensitivity of nanocrystalline Cu Scripta Materialia. ,vol. 54, pp. 1913- 1918 ,(2006) , 10.1016/J.SCRIPTAMAT.2006.02.022