Effect of equal channel angular pressing on the Portevin-Le Chatelier effect in an Al3Mg alloy

被引：42
作者：
Lebedkina, T. A. [1 ]
Lebyodkin, M. A. [1 ]
Lamark, T. T. [2 ]
Janecek, M. [3 ]
Estrin, Y. [4 ,5 ]
机构：
[1] Univ Lorraine, CNRS, LEM3, UMR 7239, F-57045 Metz, France
[2] Bergen Engn AS, N-5862 Bergen, Norway
[3] Charles Univ Prague, Dept Phys Mat, CZ-12116 Prague 2, Czech Republic
[4] Monash Univ, Dept Mat Engn, Ctr Adv Hybrid Mat, Clayton, Vic 3168, Australia
[5] NITU MISiS, Lab Hybrid Nanostruct Mat, Moscow, Russia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 615卷
关键词：
Mechanical characterization; Aluminum alloys; Equal channel angular pressing; Jerky flow; Statistical analysis; Self-organization; SELF-ORGANIZED CRITICALITY; PLASTIC-FLOW PROCESSES; JERKY FLOW; MECHANICAL-PROPERTIES; TENSILE BEHAVIOR; GRAIN-REFINEMENT; SMOOTH; DEFORMATION; SIMILARITY; ALMG;
D O I：
10.1016/j.msea.2014.07.064
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Plastic deformation of alloys is often accompanied with discontinuous flow known as the Portevin-Le Chatelier (PLC) instability. Recent studies of mechanical behavior of alloys subjected to severe plastic deformation (SPD) revealed different forms this phenomenon can take as a result of grain refinement. In the present work, it is reported that SPD may effectively suppress the macroscopic stress serrations characteristic of the PLC effect. At the same time, small-scale stress fluctuations can still be resolved on the deformation curves. To investigate their nature, stress vs time curves for an Al3Mg alloy processed by equal channel angular pressing (ECAP) are compared with those obtained for the initial coarse-grained (CG) material, using statistical and multifractal approaches to multi-scale analysis of time series. An interpretation of the results in terms of the concurrency of phenomena of self-organized criticality and synchronization in the dislocation system is proposed. (C) 2014 Elsevier B.V. All rights reserved.
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页码：7 / 13
页数：7
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