Superelasticity effects and stress-induced martensitic transformations in CuAlNi alloys

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書誌事項

公開日
1976-03
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/0001-6160(76)90071-7
公開者
Elsevier BV

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説明

Abstract Superelasticity in CuAlNi single crystals has been extensively studied as a function of temperature and strain rate, using tensile tests, macroscopic and microscopic observations and the back-reflection Laue method. Two distinct superelasticity effects were found depending upon the test temperature and it is concluded that two different stress-induced transformations, β1 ⇄ β′1 and β1 ⇄ γ′1. are responsible for these effects. A new treatment in terms of an effective stress has been presented for analysis of the characteristics of a superelastic loop, such as the presence or absence of a peak at the yield point and the magnitude of the hysteresis. Thus, the difference in the two types of superelastic loops is rationalized from a fundamental point of view. Furthermore, the predictions from the treatment concerning the appearance of the peak and the strain rate dependence of the hysteresis were found to be consistent with experimental observations. The phase relationships between the β1 matrix and the two martensites. β′1 and γ′1, in temperature-stress coordinates have been discussed from a thermodynamic point of view.

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