Study on Development of Novel Mg-Based Alloys by Rapid Solidification Technology of Twin Roll Casting

Hai Jian Wang,Dong Ying Ju,Zhi Pu Pei

doi:10.4028/www.scientific.net/kem.804.23

Abstract

In this study, Mg-based alloys were prepared by rapid solidification of twin roll casting (TRC), then microstructure and element distribution were investigated respectively with Scanning Electron Microscope (SEM) and Electron Probe Micro Analyzer (EPMA). What’s more, in order to analyze microstructure and crystal structure of Mg-based alloys, experiments on specimens with the usage of X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) were also carried out. At last, the designed Mg-Re magnesium alloy with quasi-amorphous phase plus fine crystalline phase dual phase microstructure produced with our rapid solidification of TRC process. The rapid solidification process realized with a faster casting speed and a thinner roll gap that does not need any anther additional devices and vacuum environment. EPMA results and TEM analyses show that the quasi-amorphous phase has a high concentration in Al and RE element. There are quasi-amorphous phase in the middle of Mg-Re alloy cross section surrounded by dendrites phase and normal crystals. Acknowledgement. This work was supported by Cooperative Research and Development Center for Advanced Materials (CRDAM) funded by the Institute for Materials Research (IMR), Tohoku University (Project Number 18G0042).

Highlights

C Metallic glasses are currently the focus of intense research in the international metals community due to their special microstructure and properties [1]
The forming of metallic glasses (MGs) needs extremely high cooling rates due to the non-directional nature of metallic bonds and the fact that metals are comprised of individual spherical atoms, as opposed to non-spherical
We focused on developing a new kind of Mg-based alloy with the quasi-amorphous phase

Summary

Introduction

C Metallic glasses are currently the focus of intense research in the international metals community due to their special microstructure and properties [1] It is still a mystery about those questions on the development, structure and physical properties of this new phase. T In 1970, Twin roll casting (TRC) technique for preparing uniform films of metastable phases was developed by Chen and Miller [4] To date, this technique in producing metallic glass ribbons is almost limited to laboratory scale studies; TRC is an available process for producing. Considering its application, we proposed a cost-competitive method to produce the new material in sheet form.

Alloy Composition Design

Conclusion