Pseudo-creep in Cu-Al-Ni single crystal shape memory alloys

Ganesh K. Kannarpady; M. Wolverton; V. Raj Russalian; Abhijit Bhattacharyya; Sergei Pulnev

doi:10.1117/12.816376

31 March 2009 Pseudo-creep in Cu-Al-Ni single crystal shape memory alloys

Ganesh K. Kannarpady, M. Wolverton, V. Raj Russalian, Abhijit Bhattacharyya, Sergei Pulnev

Proceedings Volume 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009; 72890K (2009) https://doi.org/10.1117/12.816376
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

Neutron diffraction experiments on isothermal pseudoelastic phase transformations in Cu-13.1Al- 4.0Ni (wt.%) single crystal shape memory alloys require a "stop-start" approach at different levels of strain during the austenite (A) to martensite (M) forward transformation and the M to A reverse transformation to collect diffraction data [1]. This stop-start nature of the tests has uncovered creep-like phenomena where there is stress relaxation when the forward transformation is interrupted (at constant strain) and stress recovery when the reverse transformation is interrupted (at constant strain). This material response has been confirmed by independent tests on a table-top thermomechanical tensile test machine. We also report results on strain recovery when the forward transformation is interrupted at constant stress. This type of behavior has been previously reported for Nickel-Titanium(NiTi) tubes [2] and NiTi polycrystalline wires [3]. Certain notable differences between the creep-like behavior and classical creep response of metallic alloys will be highlighted; due to these differences, we refer to the results reported here as "pseudo-creep".

Citation Download Citation

Ganesh K. Kannarpady, M. Wolverton, V. Raj Russalian, Abhijit Bhattacharyya, and Sergei Pulnev "Pseudo-creep in Cu-Al-Ni single crystal shape memory alloys", Proc. SPIE 7289, Behavior and Mechanics of Multifunctional Materials and Composites 2009, 72890K (31 March 2009); https://doi.org/10.1117/12.816376

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