Thermodynamic and kinetic aspects of interfacial decohesion

Y. Mishin, P. Sofronis, J. L. Bassani

研究成果: Contribution to journalArticle査読

33 被引用数 (Scopus)

抄録

Thermodynamic and kinetic aspects of interfacial decohesion are analyzed for a uniformly stressed interface in the presence of an embrittling impurity. During the interfacial separation, the impurity penetrates into the interface and reduces it cohesion. Rice (1976) and Hirth and Rice (1980) analyzed the thermodynamics of this process in great detail with emphasis on the limiting cases of infinitely fast and infinitely slow separation. The 'dynamic' model of decohesion proposed in this work extends their analysis to an arbitrary relation between the rates of separation and impurity transport to the interface, including transient kinetics in which the two rates are comparable to one another. Such kinetics play an important role in the phenomenon of dynamic embrittlement observed in many materials. Calculations of dynamic decohesion have been performed for two mechanisms of impurity supply to the interface: the reaction kinetics and bulk diffusion. In both cases a kinetic parameter R has been identified such that R ≪ 1 for slow separation, R ≫ 1 for fast separation, and R ∼ 1 for the transient regime. In the transient regime, the work of decohesion, cohesive strength, the impurity concentration at the new surfaces, and other properties dend sensitively on the strain rate in agreement with experimental observations of dynamic embrittlement.

本文言語英語
ページ(範囲)3609-3622
ページ数14
ジャーナルActa Materialia
50
14
DOI
出版ステータス出版済み - 8 16 2002
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

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