Effects of Pinning and Atomic Ordering on Damping Properties and Martensitic Transformation of Copper-Based Shape Memory Alloys

Kustov, S.; Cesari, E.; Humbeeck, Jan Van

doi:10.4028/www.scientific.net/ssp.184.366

Cited by 1 publication

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References 12 publications

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“…After the aforementioned seminal studies, an important effort was made in several groups pursuing a more clear understanding of the acting mechanisms for a wider range of Cu-based alloys. In line with this aim, Prof. Van Humbeeck´s team has studied several families of alloys, including Cu-Zn-Al [14][15][16][17][18][19][20][21][22], Cu-Al-Ni [23][24][25][26][27][28][29][30], Cu-Al-Be [31][32][33][34][35][36], Cu-Al [37,38], and a comparison of results was presented in [39,40]. Of particular relevance was the finding of the phenomena referred to by these authors as the hyperstabilization of martensites.…”

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confidence: 99%

Diffusive Phenomena and the Austenite/Martensite Relative Stability in Cu-Based Shape-Memory Alloys

Pelegrina

Yawny

Sade

2018

Shap. Mem. Superelasticity

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The main characteristic of martensitic phase transitions is the coordinate movement of the atoms which takes place athermally, without the contribution of diffusion during its occurrence. However, the impacts of diffusive phenomena on the relative stability between the phases involved and, consequently, on the associated transformation temperatures and functional properties can be significant. This is particularly evident in the case of Cubased shape-memory alloys where atomic diffusion in both austenite and martensite metastable phases might occur even at room-temperature levels, giving rise to a variety of intensively studied phenomena. In the present study, the progresses made in the understanding of three selected diffusion-related effects of importance in Cu-Zn-Al and Cu-Al-Be alloys are reviewed. They are the after-quench retained disorder in the austenitic structure and its subsequent reordering, the stabilization of the martensite, and the effect of applied stress on the austenitic order. It is shown how the experimental results obtained from tests performed on single crystal material can be rationalized under the shed of a model developed to evaluate the variation of the relative stability between the phases in terms of atom pairs interchanges.

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