Effect of Annealing Temperature on Microstructure and Damping Capacity of Twin Roll Cast ZK60 Alloy

Abstract:

ZK60 alloy strip with 3.5mm thickness which produced by Twin Roll Casting (designated as TRC in short) was used in this paper. The effect of sequential annealing on microstructure and damping capacity of TRC ZK60 alloy was studied by using optical microscope (OM) and dynamic mechanical analyzer (DMA). The dendrite structure was present in TRC ZK60 alloy strip before and after annealing heat treatment. A few of recrystallized grains were present after annealed at 400°C for 1hr. The damping capacity of the strip as annealed at 400°C was better than that of annealed at the lower temperature. The room temperature (25°C) damping values (Q^-1) of ZK60 strip which was annealed at 300°C, 350°C and 400°C were 0.0079, 0.0085 and 0.0096, respectively. The damping peak P1 is a relaxation process, but the damping peak P2 is not a relaxation process. The activation energy H for P1 of TRC ZK60 strip after annealed at 400°C for 1hr was 114KJ/mol. The damping peak P1 was attributed to boundary slip controlled by grain boundary diffusion and lattice self-diffusion.

• Periodical: Advanced Materials Research (Volume 1095)
• Pages: 87-90
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1095.87
• Online since: March 2015
• Authors: Qian Hao Zang, Yu Ke Shi, Hong Mei Chen*, Jing Zhang, Yun Xue Jin
• Keywords: Activation Energy, Damping Capacity, Magnesium Alloy, Microstructure

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