Homogeneity of ultrafine-grained copper deformed by high-pressure torsion characterized by positron annihilation and microhardness

被引：14

作者：

Cizek, J. ^{[1
]}

Melikhova, O. ^{[1
]}

Janecek, M. ^{[1
]}

Srba, O. ^{[1
]}

Barnovska, Z. ^{[1
]}

Prochazka, I. ^{[1
]}

Dobatkin, S. ^{[2
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, CZ-18000 Prague 8, Czech Republic

[2] Russian Acad Sci, AA Baikov Inst Met & Mat Sci, Moscow, Russia

来源：

SCRIPTA MATERIALIA | 2011年 / 65卷 / 02期

关键词：

Severe plastic deformation; High-pressure torsion; Lattice defects; Vacancies; Positron annihilation; MICROSTRUCTURAL EVOLUTION; REFINEMENT; ALUMINUM;

D O I：

10.1016/j.scriptamat.2011.04.006

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Spatially resolved positron annihilation was employed for mapping lateral defect distribution in Cu deformed by high-pressure torsion. Parameters describing Doppler broadening of the annihilation peak were used for mapping the spatial distribution of defects. In comparison with microhardness showing a clear development towards homogeneity, positron annihilation revealed that spatial distribution of defects was far from uniform, even after 25 turns. This was mainly due to a higher concentration of deformation-induced vacancies at the periphery compared with the center. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：171 / 174

页数：4

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