Strength enhancement of an aluminum alloy through high pressure torsion
Strength enhancement of an aluminum alloy through high pressure torsion
复制标题
DOI：
10.1016/j.msea.2019.05.102
复制
发表时间：
2019-07
期刊：
影响因子：
--
通讯作者：
Uchechi Okeke;H. Yilmazer;S. Sato;C. Boehlert
中科院分区：
文献类型：
--
作者：
Uchechi Okeke;H. Yilmazer;S. Sato;C. Boehlert
高压扭转 (HPT) 用于研究铝合金 2139-T8 晶粒细化和强化的潜力。直径为 20mm、厚度约为 0.9mm 的圆盘在室温下施加 5GPa 的压力，经过 1、2、4 和 8 转后进行 HPT 加工。经过 HPT 处理的圆盘的微观结构特征表明，在一次旋转后形成了亚微米晶粒结构。 HPT 加工仅旋转一圈后就显着提高了硬度和拉伸强度，并形成了包含细化晶粒的相对均匀的微观结构。随着转数的增加，出现了一些晶粒生长。 X 射线衍射线轮廓分析表明位错排列与微观结构演化和强化行为一致。总体而言，这项研究证实了使用 HPT 制造具有增强硬度和拉伸强度的 Al 2139 的潜力。
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.