Strength enhancement of an aluminum alloy through high pressure torsion

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

卷:760

Article

Okeke, Uchechi^1,2  Yilmazer, Hakan³  Sato, Shigeo⁴  Boehlert, Carl J.¹ 

[1] Michigan State Univ, Dept Chem Engn & Mat Sci, E Lansing, MI 48824 USA

[2] Ground Vehicle Syst Ctr, Warren, MI USA

[3] Yildiz Tech Univ, Dept Met & Mat Engn, Istanbul, Turkey

[4] Ibaraki Univ, Grad Sch Sci & Engn, Hitachi, Ibaraki, Japan

关键词: High-pressure torsion;    Severe plastic deformation;    Ultrafine-grained;   

DOI  :  10.1016/j.msea.2019.05.102

来源: Elsevier

【 摘 要 】

High-pressure torsion (HPT) was used to investigate the potential of grain refinement and strengthening achievable for aluminum alloy 2139-T8. Discs of 20 mm diameter and approximately 0.9 mm thickness were HPT processed at room temperature under an applied pressure of 5 GPa after 1, 2, 4 and 8 revolutions. Microstructural characterization of the HPT-processed discs showed the formation of a sub-micron grain structure after one revolution. The HPT processing led to an exceptional increase of the hardness and tensile strength after only one revolution as well as a relatively homogenous microstructure containing refined grains. Some grain growth occurred with increasing number of revolutions. X-ray diffraction line profile analysis suggested dislocation arrangements consistent with the microstructural evolution and strengthening behavior. Overall, this study confirmed that there is a potential for using HPT for manufacturing Al 2139 with enhanced hardness and tensile strength.

【 授权许可】

Free