Microstructures and Mechanical Properties of Magnesium Alloy ZK60 Sheets after Multi-Pass Hot Rolling

Abstract:

Magnesium alloys have been widely used in automotive, bicycle, aerospace industries. Improving the mechanical properties of the materials by various forming processes has been an important issue. Grain refinement is an effective method to improve material properties. In this study, single-pass and multi-pass hot rolling processes are carried out to generate dynamic recrystallization (DRX) and fine grains and to obtain better mechanical properties on the rolled products. A mathematical model linked with FEM software DEFORM-2D is proposed to predict the dynamic recrystallization ratio and the grain size distributions during various multi-pass hot rolling processes. The effects of different thickness reductions on the grain size distributions inside the sheet are discussed. Multi-pass hot rolling experiments of magnesium alloy ZK60 sheets are carried out and the metallographic microstructures are observed. The measured grain sizes are compared with the simulation results to verify the validity of the proposed model. The effects of different thickness reductions on the mechanical properties of the rolled magnesium alloy ZK60 sheets are also investigated.

• Periodical: Key Engineering Materials (Volume 794)
• Pages: 113-120
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.794.113
• Online since: February 2019
• Authors: Yeong Maw Hwang*, Yung Lin Wang
• Keywords: Dynamic Recrystallization, Grain Size, Magnesium Alloy Sheets, Microstructure, Multi-Pass Hot Rolling

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