Microstructure and crystallization mechanism of Ti-based bulk metallic glass by electron beam welding
Wang, Gang; Huang, Yongjiang; Cao, Wei; Huang, Zhongjia; Huttula, Marko; Su, Yongsheng; Tan, Caiwang (2018-02-06)
Gang Wang, Yongjiang Huang, Wei Cao, Zhongjia Huang, Marko Huttula, Yongsheng Su, Caiwang Tan, Microstructure and crystallization mechanism of Ti-based bulk metallic glass by electron beam welding, Journal of Manufacturing Processes, Volume 32, 2018, Pages 93-99, ISSN 1526-6125, https://doi.org/10.1016/j.jmapro.2018.01.027
© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe201901303486
Tiivistelmä
Abstract
In this work, we report on the successful welding of the Ti-based bulk metallic glass (BMG) plates via electron beam welding route. Microstructure determination shows that crystalline phases exist both in weld zone (WZ) and heat affected zone (HAZ). The critical cooling rate for glass formation in WZ is depended on the solidification condition. The continuous heating transformation curve (CHT) of glass transition temperature (Tg) and crystallization temperature (Tx) during heating process, time-temperature-transformation diagram (C-curve) during cooling process, and the thermal cycle curves are obtained by Kissinger equation, nucleation theory, and temperature field simulation, respectively. The crystallization mechanism in HAZ was discussed in details during the heating and cooling processes. The intersection between cooling curve and C-curve denotes the crystallization of HAZ during the cooling process.
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