On tension-compression asymmetry in ultrafine-grained and nanocrystalline metals

被引：14

作者：

Guerses, Ercan ^{[1
]}

El Sayed, Tamer ^{[1
]}

机构：

[1] King Abdullah Univ Sci & Technol KAUST, Div Phys Sci & Engn, Computat Solid Mech Lab, Thuwal, Saudi Arabia

来源：

COMPUTATIONAL MATERIALS SCIENCE | 2010年 / 50卷 / 02期

关键词：

Nanocrystalline metals; Crystal plasticity; Porous plasticity; Voids; Tension/compression asymmetry; MECHANICAL-BEHAVIOR; RATE SENSITIVITY; SIZE DEPENDENCE; FCC METALS; CONSTITUTIVE MODEL; STRENGTH ASYMMETRY; DEFORMATION; PLASTICITY; ALLOYS; NANOWIRES;

D O I：

10.1016/j.commatsci.2010.09.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present present a physically motivated computational study explaining the tension/compression (T/C) asymmetry phenomenon in nanocrystalline (nc) and ultrafine-grained (ufg) face centered cubic (fcc) metals utilizing a variational constitutive model where the nc-metal is modeled as a two-phase material consisting of a grain interior phase and a grain boundary affected zone (GBAZ). We show that the existence of voids and their growth in GBAZ renders the material pressure sensitivity due to porous plasticity and that the utilized model provides a physically sound mechanism to capture the experimentally observed T/C asymmetry in nc- and ufg-metals. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：639 / 644

页数：6

共 46 条

[1] Deformation mechanism transitions in nanoscale fcc metals [J].

Asaro, RJ ;

Krysl, P ;

Kad, B .

PHILOSOPHICAL MAGAZINE LETTERS, 2003, 83 (12) :733-743

[2] Mechanistic models for the activation volume and rate sensitivity in metals with nanocrystalline grains and nano-scale twins [J].

Asaro, RJ ;

Suresh, S .

ACTA MATERIALIA, 2005, 53 (12) :3369-3382

[3] POLYCRYSTALLINE PLASTICITY AND THE EVOLUTION OF CRYSTALLOGRAPHIC TEXTURE IN FCC METALS [J].

BRONKHORST, CA ;

KALIDINDI, SR ;

ANAND, L .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1992, 341 (1662) :443-477

[4] On the failure of pressure-sensitive plastic materials .2. Comparisons with experiments on ultra fine grained Fe-10% Cu alloys [J].

Carsley, JE ;

Milligan, WW ;

Zhu, XH ;

Aifantis, EC .

SCRIPTA MATERIALIA, 1997, 36 (06) :727-732

[5] A SIMPLE, MIXTURES-BASED MODEL FOR THE GRAIN-SIZE DEPENDENCE OF STRENGTH IN NANOPHASE METALS [J].

CARSLEY, JE ;

NING, J ;

MILLIGAN, WW ;

HACKNEY, SA ;

AIFANTIS, EC .

NANOSTRUCTURED MATERIALS, 1995, 5 (04) :441-448

[6] Mechanical behavior of a bulk nanostructured iron alloy [J].

Carsley, JE ;

Fisher, A ;

Milligan, WW ;

Aifantis, EC .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1998, 29 (09) :2261-2271

[7] Strength and tension/compression asymmetry in nanostructured and ultrafine-grain metals [J].

Cheng, S ;

Spencer, JA ;

Milligan, WW .

ACTA MATERIALIA, 2003, 51 (15) :4505-4518

[8]

Cuitino A., 1992, Eng. Comput., V9, P437, DOI DOI 10.1108/EB023876>

[9] Toward a quantitative understanding of mechanical behavior of nanocrystalline metals [J].

Dao, M. ;

Lu, L. ;

Asaro, R. J. ;

De Hosson, J. T. M. ;

Ma, E. .

ACTA MATERIALIA, 2007, 55 (12) :4041-4065

[10] Yield strength asymmetry in metal nanowires [J].

Diao, JK ;

Gall, K ;

Dunn, ML .

NANO LETTERS, 2004, 4 (10) :1863-1867

← 1 2 3 4 5 →