Kinetics of martensitic transitions in Cu-Al-Mn under thermal cycling: Analysis at multiple length scales
Kinetics of martensitic transitions in Cu-Al-Mn under thermal cycling: Analysis at multiple length scales
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DOI：
10.1103/physrevb.69.064101
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发表时间：
2004-02
影响因子：
3.7
通讯作者：
F. Pérez-Reche;M. Stipcich;E. Vives;L. Mañosa;A. Planes;M. Morin
中科院分区：
文献类型：
--
作者：
F. Pérez-Reche;M. Stipcich;E. Vives;L. Mañosa;A. Planes;M. Morin
本文研究了Cu-Al-Mn单晶在热循环下马氏体相变动力学特征的演化。使用几种实验技术，包括光学显微镜，量热法和声发射，使我们能够在多个尺度上进行分析。特别地，我们着重分析了与马氏体畴形核和生长有关的雪崩事件，这发生在过渡期间。在大尺度和小尺度下的动力学之间存在显著差异。一方面，在小的长度尺度上，小的雪崩事件倾向于在随后的循环中相加以产生新的更大的事件。另一方面，在大的长度尺度下，大的畴在热循环时倾向于分裂成较小的畴。我们认为，这种不同的行为是必要的成分，导致系统的最终临界状态对应的幂律分布的雪崩。
In this paper we study the evolution of the kinetic features of the martensitic transition in a Cu-Al-Mn single crystal under thermal cycling. The use of several experimental techniques including optical microscopy, calorimetry, and acoustic emission, has enabled us to perform an analysis at multiple scales. In particular, we have focused on the analysis of avalanche events ~associated with the nucleation and growth of martensitic domains!, which occur during the transition. There are significant differences between the kinetics at large and small length scales. On the one hand, at small length scales, small avalanche events tend to sum to give new larger events in subsequent loops. On the other hand, at large length scales the large domains tend to split into smaller ones on thermal cycling. We suggest that such different behavior is the necessary ingredient that leads the system to the final critical state corresponding to a power-law distribution of avalanches.