Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion

被引：81

作者：

Oberdorfer, Bernd ^{[1
]}

Lorenzoni, Bernd ^{[1
]}

Unger, Katrin ^{[1
]}

Sprengel, Wolfgang ^{[1
]}

Zehetbauer, Michael ^{[2
]}

Pippan, Reinhard ^{[3
]}

Wuerschum, Roland ^{[1
]}

机构：

[1] Graz Univ Technol, Inst Mat Phys, A-8010 Graz, Austria

[2] Univ Vienna, Fak Phys, A-1010 Vienna, Austria

[3] Austrian Acad Sci, Erich Schmid Inst Werkstoffwissensch, Leoben, Austria

来源：

SCRIPTA MATERIALIA | 2010年 / 63卷 / 04期

基金：

奥地利科学基金会;

关键词：

High-pressure torsion; Nanocrystalline iron; Crystal defects; Recrystallization; SEVERE PLASTIC-DEFORMATION; BOUNDARIES; EXPANSION; METALS; ALLOYS; ENERGY; COPPER; DIFFUSION; VACANCIES; KINETICS;

D O I：

10.1016/j.scriptamat.2010.05.007

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A maximum excess volume Delta V/V approximate to 1.9 x 10(-3) in ultrafine-grained Fe prepared by high-pressure torsion is determined by measurements of the irreversible length change upon annealing employing a high-resolution differential dilatometer. Since dislocations and equilibrium-type grain boundaries cannot fully account for the observed released excess volume, the present study yields evidence for a high concentration of free volume-type defects inherent to nanophase materials, which is considered to be the main source of their particular properties, such as strongly enhanced diffusivities. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：452 / 455

页数：4

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