Stress-induced martensitic phase transformations in polycrystalline CuZnAl shape memory alloys under different stress states

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OriginalspracheEnglisch
Seiten (von - bis)765-773
Seitenumfang9
FachzeitschriftMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Jahrgang29 A
Ausgabenummer3
PublikationsstatusVeröffentlicht - März 1998
Extern publiziertJa

Abstract

The effect of different uniaxial and triaxial stress states on the stress-induced martensitic transformation in CuZnAl was investigated. Under uniaxial loading, it was found that the compressive stress level required to macroscopically trigger the transformation was 34 pct larger than the required tensile stress. The triaxial tests produced effective stress-strain curves with critical transformation stress levels in between the tensile and compressive results. It was found that pure hydrostatic pressure was unable to experimentally trigger a stress-induced martensitic transformation due to the large pressures required. Traditional continuum-based transformation theories, with transformation criteria and Clausius-Clapeyron equations modified to depend on the volume change during transformation, could not properly predict stress-state effects in CuZnAl. Considering a combination of hydrostatic (volume change) effects and crystallographic effects (number of transforming variants), a micro-mechanical model is used to estimate the dependence of the critical macroscopic transformation stress on the stress state.

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Stress-induced martensitic phase transformations in polycrystalline CuZnAl shape memory alloys under different stress states. / Gall, Ken; Sehitoglu, Huseyin; Maier, Hans J. et al.
in: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Jahrgang 29 A, Nr. 3, 03.1998, S. 765-773.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

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abstract = "The effect of different uniaxial and triaxial stress states on the stress-induced martensitic transformation in CuZnAl was investigated. Under uniaxial loading, it was found that the compressive stress level required to macroscopically trigger the transformation was 34 pct larger than the required tensile stress. The triaxial tests produced effective stress-strain curves with critical transformation stress levels in between the tensile and compressive results. It was found that pure hydrostatic pressure was unable to experimentally trigger a stress-induced martensitic transformation due to the large pressures required. Traditional continuum-based transformation theories, with transformation criteria and Clausius-Clapeyron equations modified to depend on the volume change during transformation, could not properly predict stress-state effects in CuZnAl. Considering a combination of hydrostatic (volume change) effects and crystallographic effects (number of transforming variants), a micro-mechanical model is used to estimate the dependence of the critical macroscopic transformation stress on the stress state.",
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AU - Gall, Ken

AU - Sehitoglu, Huseyin

AU - Maier, Hans J.

AU - Jacobus, Kurt

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