Experimental Studies of Phase Transformation in Shape Memory Alloys

  • Kyubum Kim
  • Samantha Daly
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

This paper presents experimental studies to examine stress-induced martensitic phase transformation during the superelastic deformation of the shape memory alloy Nickel-Titanium. The phase transformation, which is solid-to-solid and diffusionless, occurs between austenite, a B2 cubic crystal structure, and martensite, a monoclinic crystal structure during loading and unloading at constant ambient temperature. To examine the complex local thermo-mechanical interactions that affect transformation behavior, we utilize a temporally- and spatially- simultaneous combination of strain and thermal mapping using three-dimensional digital image correlation and infrared thermography, respectively. This combined experimental approach enables full-field, quantitative maps of strain and temperature fields over the specimen surface, allowing the investigation of factors including cycling, strain rate, texture, and local temperature variations. The effects of these factors on fundamental transformation properties, such as the stresses required for phase nucleation and propagation, accumulated residual plastic strain, total strain accommodated by phase transformation, the evolution of martensitic volume fraction, and the amount of hysteresis, are discussed.

Keywords

Titanium Nickel Austenite Martensite Calorimetry 

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Copyright information

© The Society for Experimental Mechanics, Inc. 2011

Authors and Affiliations

  • Kyubum Kim
    • 1
  • Samantha Daly
    • 1
  1. 1.Department of Mechanical EngineeringThe University of MichiganAnn ArborUSA

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