Hot deformation behaviour of Mg-3Al alloy - A study using processing map

被引:205
作者
Srinivasan, N. [1 ]
Prasad, Y. V. R. K. [2 ]
Rao, P. Rama [3 ]
机构
[1] Def Met Res Lab, Hyderabad 500258, Andhra Pradesh, India
[2] Indian Inst Sci, Dept Met, Bangalore 560012, Karnataka, India
[3] Int Adv Res Ctr Powder Met & New Mat, Hyderabad, Andhra Pradesh, India
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 476卷 / 1-2期
关键词
processing map; dynamic recrystallization; dynamic recovery; grain boundary sliding; workability;
D O I
10.1016/j.msea.2007.04.103
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The hot deformation behaviour of Mg-3Al alloy has been studied using the processing-map technique. Compression tests were conducted in the temperature range 250-550 degrees C and strain rate range 3 x 10(-4) to 10(2) s(-1) and the flow stress data obtained from the tests were used to develop the processing map. The various domains in the map corresponding to different dissipative characteristics have been identified as follows: (i) grain boundary sliding (GBS) domain accommodated by slip controlled by grain boundary diffusion at slow strain-rates (<10(-3) s(-1)) in the temperature range from 350 to 450 degrees C, (ii) two different dynamic recrystallization (DRX) domains with a peak efficiency of 42% at 550 degrees C/10(-1) s(-1) and 425 degrees C/10(2) s(-1) governed by stress-assisted cross-slip and thermally activated climb as the respective rate controlling mechanisms and (iii) dynamic recovery (DRV) domain below 300 degrees C in the intermediate strain rate range from 3 x 10(-2) to 3 x 10(-1) s(-1). The regimes of flow instability have also been delineated in the processing map using an instability criterion. Adiabatic shear banding at higher strain rates (>10(1) s(-1)) and solute drag by substitutional Al atoms at intermediate strain rates (3 x 10(-2) to 3 x 10(-1) s(-1)) in the temperature range (350-450 degrees C) are responsible for flow instability. The relevance of these mechanisms with reference to hot working practice of the material has been indicated. The processing maps of Mg-3Al alloy and as-cast Mg have been compared qualitatively to elucidate the effect of alloying with aluminum on the deformation behaviour of magnesium. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:146 / 156
页数:11
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