Ding Ziheng, Ding Chaogang, Yang Zhiqin, Zhang Hao, Wang Fanghui, Li Hushan, Xu Jie, Shan Debin, Guo Bin
Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150001, China.
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel). 2024 Sep 15;17(18):4535. doi: 10.3390/ma17184535.
In this study, high-pressure torsion (HPT) processing is applied to the as-cast AlCoCrFeNi high-entropy alloy (HEA) for 1, 3, and 5 turns. Microstructural observations reveal a significant refinement of the second phase after HPT processing. This refinement effect is influenced by the number of processing turns and the distance of the processing position from the center. As the number of processing turns or the distance of the processing position from the center increases, the fragmentation effect on the second phase becomes more pronounced. The hardness of the alloy is greatly enhanced after HPT processing, but there is an upper limit to this enhancement. After increasing the number of processing turns to 5, the increase in hardness at the edge becomes less significant, while the overall hardness becomes more uniform. Additionally, the strength of the processed alloy is significantly enhanced, while its ductility undergoes a noticeable decrease. With an increase in the number of processing turns, the second phase is further refined, resulting in improvement of strength and ductility.
在本研究中，对铸态AlCoCrFeNi高熵合金（HEA）进行1、3和5圈的高压扭转（HPT）处理。微观结构观察表明，HPT处理后第二相有显著细化。这种细化效果受加工圈数和加工位置距中心距离的影响。随着加工圈数或加工位置距中心距离的增加，对第二相的破碎作用变得更加明显。HPT处理后合金的硬度大幅提高，但这种提高存在上限。将加工圈数增加到5后，边缘处硬度的增加变得不那么显著，而整体硬度变得更加均匀。此外，加工后合金的强度显著提高，而其延展性则明显下降。随着加工圈数的增加，第二相进一步细化，从而导致强度和延展性的提高。
