On the Occurrence of Portevin-Le ChA¢telier Instabilities in Ultrafine-Grained 5083 Aluminum Alloys

被引：35

作者：

Joshi, S. P. ^{[1
,2
]}

Eberl, C. ^{[2
,3
]}

Cao, B. ^{[2
]}

Ramesh, K. T. ^{[2
]}

Hemker, K. J. ^{[2
]}

机构：

[1] Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore

[2] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[3] Univ Karlsruhe, Inst Zuverlassigkeit Bauteilen & Syst, D-76131 Karlsruhe, Germany

来源：

EXPERIMENTAL MECHANICS | 2009年 / 49卷 / 02期

关键词：

Portevin-Le Chatelier instability; Grain size; Micro-tensile testing; DIC; Stability analysis; NANOSTRUCTURED MATERIALS; POLYCRYSTAL PLASTICITY; CHATELIER BANDS; DEFORMATION; FLOW; NANOCRYSTALLINE; EVOLUTION; DYNAMICS;

D O I：

10.1007/s11340-008-9208-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Portevin-Le ChA cent telier (PLC) instability is commonly observed in Al-Mg alloys and is manifested in serrated flow within the stress-strain response. We investigate the persistence of this instability with reduction in grain size by studying an ultrafine-grained (ufg) aluminum alloy (Al5083) and a conventional grain size Al5083. Micro-scale tensile tests combined with digital image correlation (DIC) reveal strength anisotropy and heterogeneity of the deformation in the three material directions (extrusion, rolled, and transverse). For the same applied displacement rate, the PLC effect in ufg-Al5083 is observed only over a small strain range immediately following the yield, while the coarse-grained Al5083 exhibits serrated flow over nearly the entire plastic strain range. These observations are explained using the stability analysis of Hahner (Acta Mater 45:3695-3707, 1997), and implications for nanocrystalline (nc) alloys are discussed.

引用

页码：207 / 218

页数：12

共 30 条

[1] Finite-Element displacement fields analysis from digital images: Application to portevin-le chatelier bands [J].

Besnard, G. ;

Hild, F. ;

Roux, S. .

EXPERIMENTAL MECHANICS, 2006, 46 (06) :789-803

[2] A dynamical model for the Portevin-le Chatelier bands [J].

Bharathi, MS ;

Rajesh, S ;

Ananthakrishna, G .

SCRIPTA MATERIALIA, 2003, 48 (09) :1355-1360

[3] Contribution of kinematic field measurements to the modelling of the Portevin-Le Chatelier effect by the image correlation method [J].

Bouabdallah, K. ;

Balland, P. ;

Tabourot, L. ;

Vacher, P. .

JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN, 2007, 42 (08) :589-594

[4] SERRATED YIELDING IN ALUMINIUM-3( MAGNESIUM [J].

BRINDLEY, BJ ;

WORTHINGTON, PJ .

ACTA METALLURGICA, 1969, 17 (11) :1357-+

[5] The anisotropy of the Portevin-Le Chatelier effect in aluminum alloys [J].

Cheng, XM ;

Morris, JG .

SCRIPTA MATERIALIA, 2000, 43 (07) :651-658

[6] APPLICATIONS OF DIGITAL-IMAGE-CORRELATION TECHNIQUES TO EXPERIMENTAL MECHANICS [J].

CHU, TC ;

RANSON, WF ;

SUTTON, MA ;

PETERS, WH .

EXPERIMENTAL MECHANICS, 1985, 25 (03) :232-244

[7]

Dziadon A, 1996, SCRIPTA MATER, V34, P375, DOI 10.1016/S0956-716X(95)00537-6

[8] On the critical conditions of the Portevin Le Chatelier effect [J].

Hahner, P .

ACTA MATERIALIA, 1997, 45 (09) :3695-3707

[9] Three types of Portevin-Le Chatelier effects: Experiment and modelling [J].

Jiang, Huifeng ;

Zhang, Qingchuan ;

Chen, Xuedong ;

Chen, Zhongjia ;

Jiang, Zhenyu ;

Wu, Xiaoping ;

Fan, Jinghong .

ACTA MATERIALIA, 2007, 55 (07) :2219-2228

[10] Spatial coupling in jerky flow using polycrystal plasticity [J].

Kok, S ;

Bharathi, MS ;

Beaudoin, AJ ;

Fressengeas, C ;

Ananthakrishna, G ;

Kubin, LP ;

Lebyodkin, M .

ACTA MATERIALIA, 2003, 51 (13) :3651-3662

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