Dynamic recrystallization and recovery during high-pressure torsion: Experimental evidence by torque measurement using ring specimens

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:559

Article

Edalati, Kaveh^1,2  Horita, Zenji^1,2  Furuta, Tadahiko³  Kuramoto, Shigeru³ 

[1] Kyushu Univ, Dept Mat Sci & Engn, Fac Engn, Fukuoka 8190395, Japan

[2] Kyushu Univ, WPI, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 8190395, Japan

[3] Toyota Cent Res & Dev Labs Inc, Frontier Res Ctr, Nagakute, Aichi 4801192, Japan

关键词: Severe plastic deformation (SPD);    Aluminum;    Copper;    Stacking fault energy;    Homologous temperature;    Twin;   

DOI  :  10.1016/j.msea.2012.08.132

来源: Elsevier

【 摘 要 】

Several pure metals exhibit softening when imparting large strains at room temperature. This study investigates the nature of this strain softening. Torque measurements during high-pressure torsion using ring specimens, which appear to be more suitable than disk specimens for the evaluation of the strain response on the in situ flow stress, suggest that the softening in aluminum occurs mainly by dynamic recrystallization and recovery, whereas no appreciable dynamic softening occurs in copper. The softening in aluminum is associated with decreasing the dislocation density and increasing the grain size and missorientation angles, whereas copper exhibits ultrafine grains of higher dislocation density and few nanotwins. A significant static recrystallization is detected in HPT-processed pure copper by argon irradiation during ion milling. (C) 2012 Elsevier B.V. All rights reserved.

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