Zhang Weijian, Tao Pingjun, Chen Yugan, Si Junfeng, Huang Zhenghua, Zhu Kunsen, Yang Yuanzheng
School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.
Guangdong Kiatest Technology Co., LTD, Guangzhou, 510700, People's Republic of China.
Sci Rep. 2022 Mar 24;12(1):5060. doi: 10.1038/s41598-022-08848-z.
ZrCuNiAl alloy bars were prepared by copper mold suction casting, and the structure and thermodynamic properties of the prepared specimens were characterized by X-ray diffractometer and differential scanning calorimeter. Furthermore, isothermal crystallization mechanism and crystallization activation energy were investigated by Johnson-Mehl-Avrami model and Arrhenius equation. The results show that the structure of the specimen is amorphous. The glass transition temperature (T), onset crystallization temperature (T) and crystallization peak temperature (T) are 713 K, 779 K, and 781 K, respectively, and supercooled liquid region ([Formula: see text]) is 66 K. The crystallization incubation times are shortened and the crystallization transformation rates increase with temperature rising. As the crystallization volume fraction increases, the crystallization nucleation rate shows a trend of first increasing and subsequently decreasing, while the activation energy decreases monotonously, in the same time, the crystallization behavior transforms from interface-controlled to diffusion-controlled growth. The thermal stability of amorphous alloy is also discussed.
采用铜模吸铸法制备了ZrCuNiAl合金棒材，并用X射线衍射仪和差示扫描量热仪对制备试样的结构和热力学性能进行了表征。此外，通过Johnson-Mehl-Avrami模型和Arrhenius方程研究了等温结晶机理和结晶活化能。结果表明，试样的结构为非晶态。玻璃化转变温度（T）、起始结晶温度（T）和结晶峰值温度（T）分别为713 K、779 K和781 K，过冷液相区（[公式：见原文]）为66 K。随着温度升高，结晶孕育期缩短，结晶转变速率增加。随着结晶体积分数的增加，结晶成核速率呈先增加后降低的趋势，而活化能单调降低，同时，结晶行为从界面控制生长转变为扩散控制生长。还讨论了非晶合金的热稳定性。
