|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Investigation of crystallization behavior according to oxidation degree by constructing TTT diagram of Mg MG using FSDC
||Min Kyung Kwak, Wook Ha Ryu, Eun Soo Park
|On-Site Speaker (Planned)
||Min Kyung Kwak
Oxidation reduces the critical cooling rate of bulk metallic glass (BMG) and causes its mechanical properties to deteriorate. Therefore, various manufacturing processes to prevent oxidation and alloy compositions that are difficult to oxidize have been developed. However, there is no quantitative study on how oxidation actually promotes the crystallization reaction to reduce the critical cooling rate of BMG. In this study, we investigate the effect of oxidation on the crystallization behavior of Mg-Cu-Gd BMGs with fast heating calorimetry (Flash DSC) that can operate at a speed of up to 10^4 K/s. The Time-Temperature-Transformation (TTT) diagram is drawn to comprehensively analyze the effect of oxidation on the crystallization behavior, and accordingly, the change in the critical cooling rate according to the degree of oxidation was presented quantitatively. This study provides a comprehensive understanding of the heterogeneous crystallization behavior of BMGs in highly oxidized states through reliable experimental evidence.