Tension - Compression Asymmetry in Co&lt;sub&gt;49&lt;/sub&gt;Ni&lt;sub&gt;21&lt;/sub&gt;Ga&lt;sub&gt;30&lt;/sub&gt; High-Temperature Shape Memory Alloy Single Crystals

Niendorf, Т.; Dadda, J.; Lackmann, J.; Monroe, James A.; Караман, И.; Panchenko, E. Yu.; Karaca, H.E.; Maier, Hans Jürgen

doi:10.4028/www.scientific.net/msf.738-739.82

Cited by 11 publications

(8 citation statements)

References 19 publications

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“…5). At the same time tensile loads favor single martensite variants [23], which is in good agreement with the current results for the evolution of permanent strain as well as for stress hysteresis (Figs. 4, 5).…”

Section: Discussionsupporting

confidence: 92%

“…The maximum temperature for PE has been reported to be about 400°C [21]. At the same time formability of the alloy can be adjusted by incorporation of the disordered secondary c-phase (A1) [2,[21][22][23]. Generally, Co-Ni-Ga alloys undergo a martensitic transformation to a tetragonal structure (L1 0 ) from the high-temperature cubic B2-structured austenite [12,14,[21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…Co-Ni-Ga HT-SMAs have been characterized intensely in recent years. Structural and phase transformation characteristics as well as the general superelastic behavior up to temperatures of about 400°C [12,14,[21][22][23][24][25][26][27][28][29] have been thoroughly examined.…”

Section: Introductionmentioning

confidence: 99%

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Functional Fatigue and Tension–Compression Asymmetry in [001]-Oriented Co49Ni21Ga30 High-Temperature Shape Memory Alloy Single Crystals

Krooß

Niendorf

Kadletz

et al. 2015

Shap. Mem. Superelasticity

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Conventional shape memory alloys cannot be employed for applications in the elevated temperature regime due to rapid functional degradation. Co-Ni-Ga has shown the potential to be used up to temperatures of about 400°C due to a fully reversible superelastic stress-strain response. However, available results only highlight the superelastic response for single cycle tests. So far, no data addressing cyclic loading and functional fatigue are available. In order to close this gap, the current study reports on the cyclic degradation behavior and tensioncompression asymmetry in [001]-oriented Co 49 Ni 21 Ga 30 single crystals at elevated temperatures. The cyclic stressstrain response of the material under displacement controlled superelastic loading conditions was found to be dictated by the number of active martensite variants and different resulting stabilization effects. Co-Ni-Ga shows a large superelastic temperature window of about 400°C under tension and compression, but a linear Clausius-Clapeyron relationship could only be observed up to a temperature of 200°C. In the present experiments, the samples were subjected to 1000 cycles at different temperatures. Degradation mechanisms were characterized by neutron diffraction and transmission electron microscopy. The results in this study confirm the potential of these alloys for damping applications at elevated temperatures.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Functional Fatigue and Tension–Compression Asymmetry in [001]-Oriented Co49Ni21Ga30 High-Temperature Shape Memory Alloy Single Crystals

Krooß

Niendorf

Kadletz

et al. 2015

Shap. Mem. Superelasticity

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“…The Heusler-type Co-Ni-Ga alloy which is subject of the current study was initially developed to exploit magnetic shape memory effects [12]. However, Co-Ni-Ga has proven good pseudoelastic behaviour at elevated temperatures up to 400 °C making it attractive for HT-SMA applications [9,10,13,[14][15][16][17][18][19]. Moreover, in a very recent study it was shown that Co-Ni-Ga can be qualified for HT actuation [19].…”

Section: ____________________________________________________________mentioning

confidence: 95%

Martensite stabilization in shape memory alloys – Experimental evidence for short-range ordering

et al. 2015

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“…Using the single crystals of Co 49 Ni 21 Ga 30 alloy with orientation [001], it was shown that a plot of superelasticity obtained during tension and compression of single crystals have a different view (have asymmetry) [52]. The value of SE is also different.…”

Section: Superelasticitymentioning

confidence: 99%

Reversibility of the Martensitic Transformations and Shape-Memory Effects

Lobodyuk

2016

Usp. Fiz. Met.

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The results of the investigations of main peculiarities and reversibility of the martensitic transformations in different materials are considered and discussed. Unusual mechanical properties such as shape-memory effect, superelasticity, superplasticity, and other phenomena caused by these transitions are also analysed. The values of the recovering deformation are determined by the mechanism of the martensitic transformations and their reversibility. Reasons for their differences for the alloys with different characters of the martensitic transitions are also discussed.Розглядаються й обговорюються результати досліджень основних особ-ливостей та оборотности мартенситних перетворень в різних матерія-лах. Проводиться аналіза таких незвичайних механічних властивостей, як ефект пам'яти форми, надпружність, надпластичність, та інших явищ, спричинених такими переходами. Величини відновлюваної де-формації визначаються механізмом мартенситних перетворень та їх оборотністю. Також обговорюються причини їхніх різних значень у стопів із різними характерами мартенситних переходів.Рассматриваются и обсуждаются результаты исследований основных особенностей и обратимости мартенситных превращений в различных материалах. Проводится анализ таких необычных механических свойств, как эффект памяти формы, сверхупругость, сверхпластич-ность, и других явлений, вызванных такими переходами. Величины восстанавливаемой деформации определяются механизмом мартенсит-ных превращений и их обратимостью. Также обсуждаются причины их разных значений у сплавов с различными характерами мартенситных переходов.Keywords: alloy, phase, martensitic transformation, reversibility, morphology, defect structure. Успехи физ. мет. / Usp. Fiz. Met. 2016, т. 17, сс. 89-118 DOI: http://dx.doi.org/10.15407/ufm.17

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Tension - Compression Asymmetry in Co<sub>49</sub>Ni<sub>21</sub>Ga<sub>30</sub> High-Temperature Shape Memory Alloy Single Crystals

Cited by 11 publications

References 19 publications

Functional Fatigue and Tension–Compression Asymmetry in [001]-Oriented Co49Ni21Ga30 High-Temperature Shape Memory Alloy Single Crystals

Functional Fatigue and Tension–Compression Asymmetry in [001]-Oriented Co49Ni21Ga30 High-Temperature Shape Memory Alloy Single Crystals

Martensite stabilization in shape memory alloys – Experimental evidence for short-range ordering

Reversibility of the Martensitic Transformations and Shape-Memory Effects

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