On the Thermodynamic Aspect of Interaction Between Dislocations and Highly Mobile Interstitial Solute:With Special Focus on Recent Progress in Pd–H System:A Review

作     者：Sheng Li Yu-Zeng Chen Yu-Ke Cao Feng Liu 

作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical University 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2016年第29卷第2期

页      面：120-128页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.51101121 51125002 51431008and 51371147) the Fundamental Research Fund of Northwestern Polytechnical University(No.3102014JCQ01025) the New Century Excellent Person Supporting Project(NCET-13-0470) the Fundamental Research Funds for the Central Universities(No.3102015BJ(II)ZS001) the Natural Science Foundation of Shaanxi province(No.2013JM6009) 

主　　题：Plastic deformation Dislocation Interstitial solute Strengthening mechanism Thermodynamics 

摘      要：It is well known that, in kinetics, the interaction between dislocations and interstitial solute normally exerts strong solute drag effect on dislocations, leading to strong solution hardening of the metals. However, due to the low mobility of interstitial solute in many metals, thermodynamic aspect of the interaction between dislocations and interstitial solute is often unobservable and omitted. It will be shown in this article by reviewing the H-induced behaviors in metal-H systems, especially the recent progress in Pd-H system that, when the interstitial solute atoms are highly mobile and able to collect in the vicinity of mobile dislocations easily, the scenario will be remarkably different. The interaction between dislocations and these highly mobile interstitial solute atoms, in thermodynamics, will reduce the line energy of dislo- cations and will facilitate the generation of dislocations, leading to an increase in dislocation density and an enhanced strain hardening of metals upon plastic deformation.