Nanostructure control of age-hardenable Al 2024 alloy by high-pressure torsion

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Mohamed, Intan Fadhlina^1,2 ; Lee, Seungwon^1,2 ; Horita, Zenji^1,2

Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan^1

WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan^2

关键词: Age-hardenable;    Aging treatment;    Applied pressure;    Average grain size;    Hardness levels;    High pressure torsions;    Microstructural refinement;    Nano-structure control;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012083/pdf
DOI  :  10.1088/1757-899X/63/1/012083

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A concurrent strengthening process by high-pressure torsion (HPT) and fine precipitation hardening of an Al 2024 alloy has been studied. The HPT was conducted on disks of the alloys under an applied pressure of 6 GPa for 0.75 and 5 turns with a rotation speed of 1 rpm at room temperature. The HPT processing leads to microstructural refinement with an average grain size of ∼240 nm and to an increase in hardness up to a saturation after 5 turns. Aging treatment is performed for sample after 5 turns at temperatures of 423 K for a maximum period up to 256 hours. The hardness increased above the hardness level after HPT processing through the subsequent aging. This study thus suggests that simultaneous hardening due to grain refinement and fine precipitation occurred by a combination of HPT processing and subsequent aging at 423 K.