Acta Metall Sin  2012, Vol. 48 Issue (2): 129-134    DOI: 10.3724/SP.J.1037.2011.00755

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EVOLUTIONS OF MICROSTRUCTURE AND MICROTEXTURE IN AZ21 Mg ALLOY DURING MULTI–DIRECTIONAL FORGING UNDER DECREASING TEMPERATURE CONDITIONS

YANG Xuyue 1,2, SUN Huan 1, WU Xinxing 1, MA Jijun 1, QIN Jia 1, HUO Qinghuan 1

1. School of Materials Science and Engineering, Central South University, Changsha 410083 2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083

YANG Xuyue SUN Huan WU Xinxing MA Jijun QIN Jia HUO Qinghuan. EVOLUTIONS OF MICROSTRUCTURE AND MICROTEXTURE IN AZ21 Mg ALLOY DURING MULTI–DIRECTIONAL FORGING UNDER DECREASING TEMPERATURE CONDITIONS. Acta Metall Sin, 2012, 48(2): 129-134.

Abstract References Related Articles Recommended Metrics Download:  PDF(923KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Grain refinement and texture evolution of a magnesium alloy AZ21 were investigated during multi–directional forging under decreasing temperature from 673 K to 433 K. Dynamic recrystallization (DRX) and texture development were studied at 673 K by OM and SEM/EBSD techniques. The flow curves show rapid hardening accompanied by a stress peak at relatively low strains, followed by strain softening and then a steady state flow stress at high strains. Kink bands with low to medium angle misorientations are evolved at corrugated grain boundaries and also frequently in grain interiors at low strains. Some of them intersect with each other, leading to the fragmentation of original grains. The alignment of the basal planes initially parallel to the compression axis rotated gradually by compression at 673 K and approached an orientation perpendicular to the compression axis at ε=1.2. The relative intensity of texture decreases rapidly with increasing strain to ε=0.4 and goes up later. A similar trend of texture evolution is recognized for the second pass, implying slightly effect of temperature but rather of strain. It is also concluded that increasing the deformation passes can lead to a decrease in texture intensity. Key words:  magnesium alloy      multi-directional forging under decreasing temperature      grain refinement      kink band      microtexture evolution      Received:  05 December 2011      ZTFLH:  TG146.2   Fund:  Supported by National Natural Science Foundation of China (No.51071182) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors YANG Xu-Ti XUN Huan WU Xin-Xing MA Ji-Jun QIN Jia SUO Qiang-Huan URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00755     OR     https://www.ams.org.cn/EN/Y2012/V48/I2/129 [1] Perez–Prado M T, Valle J A, Contreras J M, Ruano O A. Scr Mater, 2004; 50: 661 [2] Robert G, Matthias M F, Gunter G. Mater Sci Eng, 2005; A395: 338 [3] Chino Y, Mabuchi M. Adv Eng Mater, 2001; 3: 981 [4] Akihiro Y, Zenji H, Terence G. Mater Sci Eng, 2001; A300: 142 [5] Kim H K, Kim W J. Mater Sci Eng, 2004; A385: 300 [6] Chang H, Zheng M Y, Wu K, Gan W M, Tong L B, Brokmeier H G. 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