A critical examination of pure tantalum processed by high-pressure torsion

被引：46

作者：

Maury, Nicolas ^{[1
]}

Zhang, Nian Xian ^{[2
]}

Huang, Yi ^{[2
]}

Zhilyaev, Alexander P. ^{[3
,4
]}

Langdon, Terence G. ^{[2
,5
,6
]}

机构：

[1] INPT, ENSIACET, F-31077 Toulouse 04, France

[2] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England

[3] Russian Acad Sci, Inst Met Supeiplast Problems, Ufa 450001, Russia

[4] St Petersburg State Polytech Univ, Res Lab Mech New Nanomat, St Petersburg 195251, Russia

[5] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[6] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 638卷

基金：

欧洲研究理事会; 俄罗斯科学基金会;

关键词：

Electron backscatter diffraction; Hardness; High-pressure torsion; Tantalum; Ultrafine grains; SEVERE PLASTIC-DEFORMATION; ULTRAFINE-GRAINED MATERIALS; STACKING-FAULT ENERGY; ATOMIC BOND PARAMETERS; MECHANICAL-PROPERTIES; DEFORMED TANTALUM; THERMAL-STABILITY; CUBIC METALS; REFINEMENT; ALLOY;

D O I：

10.1016/j.msea.2015.04.053

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Tantalum, a common refractory metal with body-centred cubic (BCC) crystalline structure, was processed by high-pressure torsion (HPT) at room temperature through different numbers of rotations. Significant grain refinement and high strength were achieved with a reduction in grain size from similar to 60 mu m to similar to 160 nm and an increase in strength from similar to 200 to > 1300 MPa. Hardness measurements revealed a high level of homogeneity after 10 turns of HPT but the hardness after 10 turns was slightly lower than after 5 turns indicating the occurrence of some recovery. Tensile testing at a strain rate of 1.0 x 10(-3) s(-1) gave high strengths of similar to 1200 MPa but little or no ductility after processing through 1, 5 and 10 turns. The introduction of a short-term (15 min) anneal immediately after HPT processing led to significant ductility in all samples and a reasonable level of strength at similar to 800 MPa. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：174 / 182

页数：9

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