Micro and Macromechanical Investigations of CuAlNi Single Crystal and CuAlMnZn Polycrystalline Shape Memory Alloys

Author:

Brinson L. Catherine1,Schmidt Ina2,Lammering Rolf2

Affiliation:

1. Mechanical Engineering Department, Northwestern University 633 Clark Street, Evanstan, IL 60208, USA

2. Institute for Mechanics, University of the Federal Armed Forces, Hamburg, Germany

Abstract

The micro and macromechanical transformation behavior of single and polycrystalline shape memory alloys was investigated using in situ optical microscopy. An interference filter was used on the microscope to enhance observation of grain boundaries and martensitic plate formation and growth. Experiments on CuAlMnZn polycrystals as well as CuAlNi single crystal shape memory alloys were performed and results are reported in this paper. Cyclic behavior, temperature effects and strain rate effects were studied in detail. Excellent correlation between stress relaxation and temperature decay at several strain rates was achieved. At high strain rates, a dramatic redistribution of martensitic variants was seen in the single crystal specimens after loading to a fixed strain. Tests were performed at different temperatures to help identify the mechanism for variant redistribution.

Publisher

SAGE Publications

Subject

Mechanical Engineering,General Materials Science

Reference25 articles.

1. Abeyaratne, R. , Chu, C. et al. 1994. Kinetics and Hysteresis in Martensitic Single Crystals. ASME IMECE, Chicago, ASME AMD-Vol. 189:85-98.

2. Composition dependence of surface and bulk defects generated in CuZnAl single crystals after pseudoelastic cycling

3. Transient heat transfer effects on the pseudoelastic behavior of shape-memory wires

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