Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effect of Recrystallization Behavior of AZ31 Magnesium Alloy on Damping Capacity

Version 1 : Received: 28 December 2022 / Approved: 29 December 2022 / Online: 29 December 2022 (01:50:12 CET)

A peer-reviewed article of this Preprint also exists.

Kim, K.; Ji, Y.; Kim, K.; Park, M. Effect of Recrystallization Behavior of AZ31 Magnesium Alloy on Damping Capacity. Materials 2023, 16, 1399. Kim, K.; Ji, Y.; Kim, K.; Park, M. Effect of Recrystallization Behavior of AZ31 Magnesium Alloy on Damping Capacity. Materials 2023, 16, 1399.

Abstract

For a wide industrial application of magnesium alloys, a method for imparting high damping properties while maintaining mechanical properties is required. Controlling the crystallographic texture seems to be useful, because dislocations are known to have a significant influence on the damping characteristics of magnesium alloys. Therefore, the effect of twinning and annealing, which can affect to the recrystallization were investigated in this study. An AZ31 alloy was hot rolled at 673K with a reduction ratio of 10 % and 50 %, and then annealed at 673K and 723K for 0.5, 1, 2, and 3H respectively. SEM-EBSD was used to examine the microstructure and texture. In addition, each specimen’s hardness and internal friction were contemporarily measured. As a result, hot rolling produced tensile twins and their fraction increased with internal friction when the reduction ratio increased. Due to annealing, a discontinuous type of static recrystallization occurred within the twinning grains, and was highly activated along with the increasing annealing temperature and the fraction of twinning. In the samples annealed at 723K, the internal friction continuously increased over the annealing time, whereas in the samples annealed at 673K, the decrease in dislocation density was delayed while, the internal friction showed a relatively low value.

Keywords

AZ31 magnesium alloy; Hot-rolling; Annealing; Static Recrystallization; Tensile Twinning; Crys-tallographic Texture; Damping Capacity

Subject

Chemistry and Materials Science, Metals, Alloys and Metallurgy

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