1 School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China 2 Sichuan Kelun Pharmaceutical Research Institute, Chengdu 611138, Sichuan, China 3 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 4 Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai 200444, China 5 School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000, Anhui, China 6 Southwest Technology and Engineering Research Institute, Chongqing 400039, China
Abstract：Four Zn-richAl–Zn–Mg–Cu alloys with differentMg andCucontentswere fabricated by spray deposition.The effects ofMgand Cu contents on the aging behaviors of the whole precipitation process of the alloys were systematically investigated. The results show that the primary precipitates in the under-aged and peak-aged alloys are GPII and η’ phases; no GPI zones were observed. During aging, the dissolution driving force of the precipitates increases with increasing Mg content; therefore, the volume fraction of precipitates in the grain interior and the area fraction of precipitates at the grain boundary increase obviously, which contributes to a considerable improvement in yield strength and decrease in plasticity of the high Mg content alloys. Cu content has no apparent effect on the size and volume fraction of precipitates. However, a higher Cu content can effectively prevent coarsening and transformation of precipitates, which is beneficial to maintain the peak aging state of the alloys. This research provides a basis for the composition optimization of the rapid-solidified highly alloying Al–Zn–Mg–Cu alloys.
Hai-chao Li,Ming Li,Dong-ye Yang, et al. Aging behavior and precipitate characterization of Zn-rich Al–Zn–Mg–Cu alloys with various Mg and Cu contents[J]. Journal of Iron and Steel Research International, 2021, 28(8): 1064-1073.
2021, Vol. 28 
