Strengthening of A2024 alloy by high-pressure torsion and subsequent aging

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

卷:704

Article

Mohamed, Intan Fadhlina^1,2,3  Masuda, Takahiro^1,2  Lee, Seungwon^1,2,4  Edalati, Kaveh^1,2  Horita, Zenji^1,2  Hirosawa, Shoichi⁵  Matsuda, Kenji⁴  Terada, Daisuke⁶  Omar, Mohd Zaidi³ 

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

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

[3] Univ Kebangsaan Malaysia, Fac Engn & Built Environm, Dept Mech & Mat Engn, Ukm Bangi 43600, Selangor, Malaysia

[4] Univ Toyama, Grad Sch Sci & Engn Res, Toyama 9308555, Japan

[5] Yokohama Natl Univ, Dept Mech Engn & Mat Sci, Yokohama, Kanagawa 2408501, Japan

[6] Chiba Inst Technol, Fac Engn, Dept Mech Sci & Engn, Narashino, Chiba 2750016, Japan

关键词: High-pressure torsion;    Severe plastic deformation;    Aluminum alloy;    Precipitation hardening;   

DOI  :  10.1016/j.msea.2017.07.083

来源: Elsevier

【 摘 要 】

An age-hardenable A2024 alloy is processed by high-pressure torsion (HPT) for grain refinement and further aged for fine precipitation. The HPT is conducted under an applied pressure of 6 GPa for 0.75, 1 and 5 turns with a rotation speed of 1 rpm at room temperature and this results in a significant grain size reduction to a grain size of similar to 240 +/- 80 nm. The hardness sharply increases with imposing strain at an early stage but level off after 5 turns. Further aging at temperatures of 373 K and 423 K leads to extra hardening above the elevated hardness of the HPT-processed condition. Components contributing to the strengthening were evaluated in terms of grain refinement and fine precipitation including the contributions from dislocation accumulation and solid solution. In this study, a conclusion is reached such that simultaneous strengthening due to grain refinement and fine precipitation is achieved by application of HPT processing and subsequent aging.

【 授权许可】

Free