期刊名称：Advances in Science and Technology Research Journal
印刷版ISSN：2080-4075
电子版ISSN：2299-8624
出版年度：2019
卷号：13
期号：4
页码：15-21
DOI：10.12913/22998624/112361
语种：English
出版社：Society of Polish Mechanical Engineers and Technicians
摘要：In this paper, the hot formability of 7075 aluminum alloy sand and permanent casting ingots were verifed. Theexperiment was carried out by using casting, heat treatment (homogenization) of ingots and conducting isothermalcompression tests at temperatures of 420-500°C. The effect of the forming temperature on the microstructure, thetendency for crack formation and hardness were determined. The results show that ingots in the as-cast state havea dendritic network structure rich in the second phase precipitation on the grain boundaries. After the homogenization process, the microstructure is signifcantly more balanced. The forming process at 420-480°C of sand castsleads to signifcant grain elongation and crack formation, mainly at the grain boundaries. Raising the formingtemperature to 480-500°C leads to a reduction in the occurrence of cracks. On the other hand, permanent moldcastings do not reveal cracks during deformation in the temperature range 420-480°C.
关键词：Aluminum alloys; Heat treatment; Metal Forming; Microstructure
