Diffusive phenomena and pseudoelasticity in Cu-Al-Be single crystals

JOURNAL OF ALLOYS AND COMPOUNDS

卷:622

Article

Sade, M.^1,2,3  Pelegrina, J. L.^1,2,3  Yawny, A.^1,2,3  Lovey, F. C.^1,3 

[1] Ctr Atom Bariloche CNEA, RA-8400 San Carlos De Bariloche, Argentina

[2] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

[3] Univ Nacl Cuyo, Inst Balseiro, RA-8400 San Carlos De Bariloche, Argentina

关键词: Metals and alloys;    Shape memory;    Phase transitions;    Diffusion;    Thermodynamic modeling;   

DOI  :  10.1016/j.jallcom.2014.10.027

来源: Elsevier

【 摘 要 】

Cu-Al-Be single crystals show pseudoelasticity and the shape memory effect in a well-defined composition range. The beta(3)-18R martensitic transition is the origin of these phenomena. The transformation temperatures and the critical stresses to induce the martensitic transition are affected by diffusive phenomena taking place both in the parent phase and in martensite. Pseudoelastic cycles were used to obtain quantitative data concerning the effect of diffusive phenomena like stabilization of martensite, ordering of the parent phase under load and recovery of this phase on the critical stresses to transform. Information was then obtained on changes in the relative phase stability. A model is presented to explain those changes taking place in the parent phase aged under load and in the martensitic 18R structure. Experimental data on the kinetics of diffusive phenomena is also presented and analyzed. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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