Dislocation structure and strength evolution of heavily deformed tantalum

被引：45

作者：

Hosseini, E. ^{[1
]}

Kazeminezhad, M. ^{[1
]}

机构：

[1] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran, Iran

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2009年 / 27卷 / 03期

关键词：

Tantalum; Severe plastic deformation; Dynamic recovery; Dislocation structure; Strength; CHANNEL ANGULAR EXTRUSION; CONSTITUTIVE MODEL; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; FCC METALS; STRAIN; DEFORMATION; BEHAVIOR; PRESSURE; CRYSTALS;

D O I：

10.1016/j.ijrmhm.2008.09.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A unified model composed of the flow function model, dislocation model and Taylor theory is used to investigate the evolution of dislocation density, cell size, and strength of tantalum during ECAP process. From the flow function model, strain and strain rate distributions are achieved and then using a modified version of three-dimensional ETMB model, the dislocation density, cell size, and strength are predicted. The predicted dislocation density, cell size, and strength are compared with the experimental data and a remarkable agreement is obtained. In addition, the effect of dynamic recovery on the strength of the processed tantalum is modeled and compared with other materials. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：605 / 610

页数：6

共 34 条

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