Experimental investigation on strain rate sensitivity of ultra-fine grained copper at elevated temperatures

被引：43

作者：

Suo Tao ^{[1
]}

Li Yu-long ^{[1
]}

Xie Kui ^{[1
]}

Zhao Feng ^{[1
]}

Zhang Ke-Shi ^{[2
]}

Deng Qiong ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sch Aeronaut, Xian 710072, Peoples R China

[2] Guangxi Univ, Coll Civil & Architectural Engn, Nanning 530004, Peoples R China

来源：

MECHANICS OF MATERIALS | 2011年 / 43卷 / 03期

基金：

美国国家科学基金会;

关键词：

Ultra-fine grained copper; Strain rate sensitivity; Elevated temperature; High strain rate; Activation volume; Dislocation-boundary interactions; SEVERE PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; ACTIVATION VOLUME; NANOCRYSTALLINE; METALS; DUCTILITY; MICROSTRUCTURE; TANTALUM; FCC; NI;

D O I：

10.1016/j.mechmat.2011.02.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Quasi-static and dynamic compression tests on ultra-fine grained (UFG) copper (Cu 99.9) were performed at temperatures ranging from 77 to 573 K and strain rates ranging from 10(-3) to 5 x 10(3) l/s using an electronic universal testing machine and the split Hopkinson pressure bar system, respectively. We focused on the strain rare sensitivity and its dependence on experimental temperatures. The results show that UFG-Cu has enhanced strain rate sensitivity that is apparently temperature dependent. The activation volume of UFG-Cu is estimated to be on the order of similar to 10b(3) at current experimental temperature and strain rate range. The plastic deformation mechanism is suggested to be dislocation-grain boundary interactions. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：111 / 118

页数：8

共 26 条

[1] A CRITICAL STUDY OF THE HOPKINSON PRESSURE BAR [J].

DAVIES, RM .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1948, 240 (821) :375-457

[2]

Estrin Y., 1996, UNIFIED CONSTITUTIVE, V1, P69, DOI [10.1016/B978-012425970-6/50003-5, DOI 10.1016/B978-012425970-6/50003-5]

[3] The shearing characteristics associated with equal-channel angular pressing [J].

Furukawa, M ;

Iwahashi, Y ;

Horita, Z ;

Nemoto, M ;

Langdon, TG .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 257 (02) :328-332

[4] Influence of strain rate & temperature on the mechanical response of ultrafine-grained Cu, Ni, AND Al-4Cu-0.5Zr [J].

Gray, GT ;

Lowe, TC ;

Cady, CM ;

Valiev, RZ ;

Aleksandrov, IV .

NANOSTRUCTURED MATERIALS, 1997, 9 (1-8) :477-480

[5] Principle of equal-channel angular pressing for the processing of ultra-fine grained materials [J].

Iwahashi, Y ;

Wang, JT ;

Horita, Z ;

Nemoto, M ;

Langdon, TG .

SCRIPTA MATERIALIA, 1996, 35 (02) :143-146

[6]

Kolsky H., 1949, Proceedings of the physical society. Section B, V62, P676, DOI DOI 10.1088/0370-1301/62/11/302

[7] A technique for measuring the dynamic behavior of materials at high temperatures [J].

Lennon, AM ;

Ramesh, KT .

INTERNATIONAL JOURNAL OF PLASTICITY, 1998, 14 (12) :1279-1292

[8] A critical assessment of high-temperature dynamic mechanical testing of metals [J].

Li, Yulong ;

Guo, Yazhou ;

Hu, Haitao ;

Wei, Q. .

INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 2009, 36 (02) :177-184

[9] Instabilities and ductility of nanocrystalline and ultrafine-grained metals [J].

Ma, E .

SCRIPTA MATERIALIA, 2003, 49 (07) :663-668

[10] Strain rate sensitivity of ultrafine grained fcc- and bcc-type metals [J].

May, J ;

Höppel, HW ;

Göken, M .

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION, 2006, 503-504 :781-786

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