A fluctuation-based characterization of athermal phase transitions: Application to shape memory alloys

被引：10

作者：

Chandni, U. ^{[1
]}

Kar-Narayan, Sohini ^{[1
]}

Ghosh, Arindam ^{[1
]}

Vijaya, H. S. ^{[2
]}

Mohan, S. ^{[2
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Dept Instrumentat, Bangalore 560012, Karnataka, India

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 20期

关键词：

Martensite transition; Conductivity noise; Athermal transition; MARTENSITIC-TRANSFORMATION; THERMODYNAMIC ANALYSIS; HEAT-TREATMENT; 1/F NOISE; NITI; TEMPERATURES; BEHAVIOR; KINETICS;

D O I：

10.1016/j.actamat.2009.08.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We employ a fluctuation-based technique to investigate the athermal component associated with martensite phase transition, which is a prototype of temperature-driven structural transformation. Statistically, when the phase transition is purely athermal, we find that the temporal sequence of avalanches under constant drive is insensitive to the drive rate. We have used fluctuations in electrical resistivity or "noise" in nickel titanium shape memory alloys in three different forms: a thin film exhibiting well-defined transition temperatures, a highly disordered film, and a bulk wire of rectangular cross-section. Noise is studied in the realm of dynamic transition, viz., while the temperature is being ramped, which probes into the kinetics of the transformation at real time scales, and could probably stand out as a promising tool for material testing in various other systems, including nanoscale devices. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：6113 / 6122

页数：10

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