Research on Microstructure, Mechanical Properties and Ageing Behaviors of Ultra-fine Grained 7075 Aluminum Alloy Fabricated by Cryogenic Temperature Extrusion Machining
YIN Xiaolong*, WANG Zhilin, WANG Wan, YU Hechun, WANG Hanbin, YAN Wenjie
School of Mechatronics Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China
Abstract: Traditional severe plastic method inevitably produces large amounts of heat, which weakens the mechanical properties of materials. Cryogenic temperature extrusion machining (CT-EM), as a new ultra-fine grained materials fabrication process, can eliminate cutting heat, suppress dynamic recovery, and improve materials strength and machinability. In this study, the microstructure, phase evolution, mechanical properties and aging behavior of ultra-fine grain 7075 aluminum alloy chips fabricated by RT-EM and CT-EM were analyzed. The results show that the average grain size of CT-EM chips is highly refined, the dislocation density is higher, and the hardness and strength are further improved. After aging treatment, a large number of dispersed precipitates appeared in the chip, the yield strength of RT-EM and CT-EM chips increased to 455 MPa and 507 MPa respectively. The grain strengthening, dislocation strengthening and precipitate strengthening work together. Cryogenic temperature treatment can enhance the precipitate kinetics of secondary phase in the microstructure, so that the CT-EM chips reach peak hardness faster. Additionally, the elongation of peak aged CT-EM sample is slightly improved, and more dimples are present in the tensile fracture.
通讯作者:
* 殷晓龙,中原工学院机电学院讲师、硕士研究生导师。2020年6月毕业于华南理工大学机械工程专业,获工学博士学位。目前主要从事现代切削理论、金属塑性成形以及机械加工数值模拟技术等方面的研究工作。发表SCI/EI论文10余篇,包括Materials Science & Engineering A、Journal of Materials Research、《机械工程学报》等。yinxl@zut.edu.cn
引用本文:
殷晓龙, 王志林, 王婉, 于贺春, 王汉斌, 闫文杰. 深冷挤出切削制备超细晶7075铝合金的组织、性能及时效行为研究[J]. 材料导报, 2023, 37(22): 22070192-6.
YIN Xiaolong, WANG Zhilin, WANG Wan, YU Hechun, WANG Hanbin, YAN Wenjie. Research on Microstructure, Mechanical Properties and Ageing Behaviors of Ultra-fine Grained 7075 Aluminum Alloy Fabricated by Cryogenic Temperature Extrusion Machining. Materials Reports, 2023, 37(22): 22070192-6.
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2023, Vol. 37 
