Effect of Warm Rolling on Microstructure and Mechanical Properties of Twin-roll Casted ZK60 Alloy Sheets

Xibing Gong,Suk Bong Kang,Jae Hyung Cho,Wentao Gong

doi:10.1590/1516-1439.319314

Xibing Gong, Suk Bong Kang + Show 2 more

Open Access

https://doi.org/10.1590/1516-1439.319314

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Abstract

In this study, ZK60 magnesium alloy strips were produced by twin roll casting (TRC) and then subjected to warm rolling at the temperature of 300 °C and 350 °C. Rolled sheets related to different rolling reductions were prepared after sequential warm rolling with the rolling speed of 5 m/min. Microstructures, texture, hardness, tensile properties of the rolled sheets with different rolling reductions were studied experimentally. It has been found that grain refinement occurs actively during the warm rolling. Also, high density of shear bands were observed in the rolled sheets. The warm rolling sheet presents strong (0002) basal texture. In addition, the increase of the rolling reduction results in the improvement of the mechanical properties.

Highlights

Magnesium (Mg) alloys are promising structural light materials due to their high specific strength, high specific stiffness, and so on
Wang et al investigated the warm rolling on Mg-Al-Mn-Ca twin roll casting (TRC) sheets and found that the present TRC sheet presents superior tensile strength and comparative elongation compared to commercial ingot cast one, suggesting the possibility of the development of wrought Mg alloy sheets by TRC5
The TRC strip shows different microstructure compared with conventional casting samples

Summary

Introduction

Magnesium (Mg) alloys are promising structural light materials due to their high specific strength, high specific stiffness, and so on. The strength of Mg alloys is relatively low at room temperature and the manufacturing cost is high. These two factors limit the wide industrial applications of Mg alloys[2]. For the producing of thin Mg alloy sheets, the subsequent warm rolling on TRC strips has the ability to achieve Mg alloy sheet with high mechanical properties[2]. Chen et al studied the microstructure and mechanical properties of Mg-4.5Al-1.0Zn alloy sheets produced by TRC and sequential warm rolling[4]. The present research is to explore the effect of warm rolling on the microstructures, textures and mechanical properties of a TRC processed ZK60 alloy. The studies would provide novel method to improve mechanical properties of the ZK60 TRC strip

Experimental

Microstructure of the TRC strip

Microstructure and texture of rolled sheets

Mechanical properties of the rolled sheets

Conclusions