Affiliation:
1. College of Mechanical Engineering, Quzhou University, Quzhou 324000, China
2. Zhejiang Bulaoshen Civil Air Protection Equipment Co., Ltd., Quzhou 324022, China
Abstract
The effects of Si, Fe and Zr elements on the high temperature properties and microstructure of ultrathin 3003mod aluminum alloy fins were studied by means of high-temperature tensile tests, sagging tests and microstructure analyses. The results show that the alloying of Si, Fe, and Zr elements formed a large amount of nano-scale α-Al(Mn,Fe) Si and Al3Zr particles, and significantly reduced the number of micro-scale coarse Al6(Mn,Fe) particles in the 3003mod aluminum alloy, exhibiting 5 to 10 MPa higher strength and better sagging resistance than 3003 aluminum alloy at the same temperature. The variations in properties such as high-temperature mechanical properties, sagging resistance and elongation below 400 °C were ascribed to the high-stability nanoparticles effectively preventing recovery and grain boundary migration, as well as reducing the nucleation cores of recrystallization. The nanoparticles in 3003mod aluminum alloy were coarsened significantly at 500 °C, and the grains were completely recrystallized and coarsened, resulted in a significant decrease in strength, sagging resistance and elongation compared with these at 400 °C.
Funder
National College Students’ Innovation and Entrepreneurship Training Program
Zhejiang College Students’ Innovation and Entrepreneurship Training Program
Joint Funds of the Zhejiang Provincial Natural Science Foundation of China
Quzhou Science and Technology Bureau