Ordering kinetics in Cu–Al–Ni shape memory alloys
1999; American Institute of Physics; Volume: 86; Issue: 10 Linguagem: Inglês
10.1063/1.371547
ISSN1520-8850
AutoresV. Recarte, R. B. Pérez‐Sáez, M.L. Nó, J. San Juán,
Tópico(s)High Entropy Alloys Studies
ResumoThe atomic order has a strong influence on the martensitic transformation behavior in Cu-based shape memory alloys. In this work we have studied the influence of the quenching and postquench aging treatments on the atomic order of the metastable β phase obtained by quenching in Cu–Al–Ni shape memory alloys by means of thermoelectric power (TEP) measurements. The initial evolution of TEP during aging shows two clear stages where TEP value decreases. These two TEP stages are interpreted as ordering processes at nearest neighbors (B2 order), and ordering processes at next nearest neighbors (L21 order), respectively. The analysis of the isothermal kinetics during aging at different temperatures has allowed us to determine the activation energies for both ordering processes.
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