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机械球磨和高压对Co相变的影响

刘力1,2, 姚斌2, 丁战辉2, 曹幼章1, 郭秀芝1, 苏文辉2   

  1. 1. 北华大学 理学院物理系, 吉林省 吉林132013; 2. 吉林大学 物理学院, 长春 130021
  • 收稿日期:2005-12-19 修回日期:1900-01-01 出版日期:2006-11-26 发布日期:2006-11-26
  • 通讯作者: 姚斌

Effects of Mechanical Milling and High Pressure on Phase Transition of Cobalt

LIU Li1,2, YAO Bin2, DING Zhan hui2, CAO You zhang1, GUO Xiu zhi1, SU Wen hui2   

  1. 1. Department of Physics, College of Science, Beihua University, Jilin 132013, Jilin Province, China; 2. College of Physics, Jilin University, Changchun 130021, China
  • Received:2005-12-19 Revised:1900-01-01 Online:2006-11-26 Published:2006-11-26
  • Contact: YAO Bin

摘要: 通过高能球磨和高压技术对Co的相变过程及其机制进行研究, 结果表明, 具有六角密积结构的α-Co经60 h高能球磨后完全转变为具有面心立方结构的β-Co, 但继续球磨直到120 h, 未观察到β-Co向α-Co的逆转变. 由于球磨碰撞引起的缺陷层错和局域温度导致α-Co到 β-Co的转变. 研究发现, 高压下β-Co向α-Co相转变, 由于β-Co向α-Co的相转变为无扩散相变, 因此, 压力可使其形核热力学势垒降低, 即压力对β-Co向α-Co的相转变具有促进作用. 

关键词: 相变, Co, 高压, 机械球磨

Abstract: Phase transition of cobalt induced by mechanical milling and high pressure and its transition mechanisms were studied. α-Co with the hcp. structure completely transformed to β-Co with the fcc. structure after milling for 60 h due to the stacking fault and local temperature resulted from impact and shear force of steel balls during the milling process. However, the reverse transition from β-Co to α-Co was not observed, even milling up to 120 h.The reverse transition was studied under high pressure, and it was found that pressure can accelerate the transition from β-Co to α-Co, which is due to that this transformation is a diffusionless one and its thermodynamic barrier decreases by pressuring.

Key words: phase transition, Co, high pressure, mechanical milling

中图分类号: 

  • O521.2