物理化学学报 >> 2007, Vol. 23 >> Issue (06): 895 -899 .doi: 10.1016/S1872-1508(07)60050-3

研究论文 上一篇    下一篇

Cu-Zr二元系非晶合金的玻璃形成能力预测

葛丽; 惠希东; 陈国良; LIU Zi-Kui   

  1. 北京科技大学, 新金属材料国家重点实验室, 北京 100083; Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA
  • 收稿日期:2006-12-01 修回日期:2007-01-29 发布日期:2007-06-04
  • 通讯作者: 惠希东 E-mail:xdhui@skl.ustb.edu.cn

Prediction of the Glass-Forming Ability of Cu-Zr Binary Alloys

GE Li; HUI Xi-Dong; CHEN Guo-Liang; LIU Zi-Kui   

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, P. R. China; Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA
  • Received:2006-12-01 Revised:2007-01-29 Published:2007-06-04
  • Contact: HUI Xi-Dong E-mail:xdhui@skl.ustb.edu.cn

摘要: 按照无序固溶模型和线性化合物自由能模型, 对Cu-Zr二元系合金过冷熔体的结晶驱动力采用Turnbull和Thompson-Spaepen (TS)两种近似公式进行了计算. 以连续形核理论为基础, 利用Davies-Uhlmann公式计算了八种成分合金的两组温度-时间转变(TTT)曲线和临界冷却速度. 计算结果表明, 关于玻璃形成能力的两组计算值与实验值都比较吻合, 利用TS公式计算得到的临界冷却速率更接近实验值, 说明该方法能更好地预测Cu-Zr二元体系的玻璃形成能力.

关键词: Cu-Zr二元系, 玻璃形成能力, 温度-时间转变曲线, 临界冷却速率

Abstract: Based on the random solution model and stoichiometric intermetallic compound Gibbs free energy model, the driving forces for the crystallization from the undercooled liquid of Cu-Zr binary alloys were evaluated by using Turnbull and Thompson-Spaepen (TS) approximate equations, respectively. Using Davies-Uhlmann kinetic formulations within the frame of continuous nucleation theory (CNT), two groups of time-temperature transformation (TTT) curves of eight compositions of the binary system were calculated, and thereby the corresponding critical cooling rates were obtained. It is shown that both groups of the calculated values for the glass-forming ability (GFA) are in good agreement with the experimental data. The critical cooling rates evaluated by using TS equation are in good agreement with the experimental data compared with that evaluated by using Turnbull equation.

Key words: Cu-Zr binary system, Glass-forming ability, Time-temperature transformation curve, Critical cooling rate

MSC2000: 

  • O643