Size dependent mechanical behaviour of tantalum

被引：70

作者：

Kaufmann, D. ^{[1
]}

Moenig, R. ^{[1
]}

Volkert, C. A. ^{[2
]}

Kraft, O. ^{[1
]}

机构：

[1] Karlsruhe Inst Technol, Inst Mat Res IMF 2 2, D-76021 Karlsruhe, Germany

[2] Univ Gottingen, Inst Mat Phys, D-37077 Gottingen, Germany

来源：

INTERNATIONAL JOURNAL OF PLASTICITY | 2011年 / 27卷 / 03期

关键词：

Bcc; Tantalum; Small scale plasticity; Size effect; Microcompression; CENTERED-CUBIC METALS; BCC METALS; ACTIVATION VOLUME; STRAIN GRADIENTS; RATE SENSITIVITY; SINGLE-CRYSTALS; MICRO-PILLARS; DEFORMATION; PLASTICITY; SCALE;

D O I：

10.1016/j.ijplas.2010.08.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The size dependence of deformation of Ta was studied using compression tests of focused ion beam (FIB) machined microcolumns. Columns with diameters between 0.5 and 8 mu m with < 1 1 1 > and < 1 0 0 > orientations along the column axis were tested. By comparing results of bcc Ta columns with results from previous experiments on fcc metals it was found that Ta shows significantly higher normalized yield stresses in combination with a weaker sample size dependence. The differences between bcc and fcc metals can be attributed to the different dislocation behaviour of bcc metals, especially to the lower mobility of screw dislocations. (C) 2010 Published by Elsevier Ltd.

引用

页码：470 / 478

页数：9

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