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

作者：Sade M^*; Pelegrina J L; Yawny A; Lovey F C

来源：Journal of Alloys and Compounds, 2015, 622: 309-317.

DOI：10.1016/j.jallcom.2014.10.027

• Metals and alloys
• Shape memory
• Phase transitions
• Diffusion
• Thermodynamic modeling

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.

• 出版日期2015-2-15