A simple dislocation model of deformation resistance of ultrafine-grained materials explaining Hall-Petch strengthening and enhanced strain rate sensitivity

被引：139

作者：

Blum, W. ^{[1
]}

Zeng, X. H. ^{[1
]}

机构：

[1] Univ Erlangen Nurnberg, Dept Mat Sci & Engn, Ins Gen Mat Properties 1, D-91058 Erlangen, Germany

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 06期

关键词：

Ultrafine grains; Dislocation generation; Dynamic recovery; Hall-Petch effect; Strain rate sensitivity; FLOW-STRESS; CREEP; BEHAVIOR; TEMPERATURE; BOUNDARIES; TRANSITION; STABILITY; KINETICS; CU;

D O I：

10.1016/j.actamat.2008.12.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A model is presented where the properties of ultrafine-grained (UFG) materials are explained in terms of the influence of high-angle boundaries on the rates at which dislocations are stored and recovered at the boundaries. The model reproduces the experimental observations that UFG materials reach a steady state where the deformation resistance is independent of strain. that the strain rate sensitivity, of flow stress is relatively high and that the steady-state flow stress increases inversely with the square root of,rain size. The model results are compared to experimental data for UFG Cu and nanostructured Ni. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1966 / 1974

页数：9

共 34 条

[1]

Bird J.E., 1969, QUANTATIVE RELATION, P255

[2] Influence of grain boundaries on steady-state deformation resistance of ultrafine-grained Cu [J].

Blum, W ;

Li, YJ .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2004, 201 (13) :2915-2921

[3] Understanding creep - a review [J].

Blum, W ;

Eisenlohr, P ;

Breutinger, F .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2002, 33 (02) :291-303

[4] Dynamics of recovery and recrystallization [J].

Blum, W ;

McQueen, HJ .

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 1996, 217 :31-42

[5]

Blum W., 1993, Materials Science and Technology, V6, P359

[6] On the Hall-Petch relation between flow stress and grain size [J].

Blum, Wolfgang .

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, 2006, 97 (12) :1661-1666

[7] Dislocation mean free paths and strain hardening of crystals [J].

Devincre, B. ;

Hoc, T. ;

Kubin, L. .

SCIENCE, 2008, 320 (5884) :1745-1748

[8] Bridging steady-state deformation behavior at low and high temperature by considering dislocation dipole annihilation [J].

Eisenlohr, P ;

Blum, W .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 400 :175-181

[9] ANNIHILATION OF DISLOCATIONS DURING TENSILE AND CYCLIC DEFORMATION AND LIMITS OF DISLOCATION DENSITIES [J].

ESSMANN, U ;

MUGHRABI, H .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1979, 40 (06) :731-756

[10] A unified microstructural metal plasticity model applied in testing, processing, and forming of aluminium alloys [J].

Holmedal, B ;

Marthinsen, K ;

Nes, E .

ZEITSCHRIFT FUR METALLKUNDE, 2005, 96 (06) :532-545

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