Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single Crystal
Simultaneous differential scanning calorimetry, DSC, and acoustic emission, AE, measurements were carried out for single crystals of quenched and stress-induced martensite stabilized (SIM-aged) shape memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>...
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MDPI AG
2020-04-01
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| Online Access: | https://www.mdpi.com/2075-4701/10/4/534 |
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| author | Nora Mohareb Samy Lajos Daróczi László Zoltán Tóth Elena Panchenko Yury Chumlyakov Nikita Surikov Dezső László Beke |
| author_facet | Nora Mohareb Samy Lajos Daróczi László Zoltán Tóth Elena Panchenko Yury Chumlyakov Nikita Surikov Dezső László Beke |
| author_sort | Nora Mohareb Samy |
| collection | DOAJ |
| description | Simultaneous differential scanning calorimetry, DSC, and acoustic emission, AE, measurements were carried out for single crystals of quenched and stress-induced martensite stabilized (SIM-aged) shape memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> alloy. The transformation temperatures were shifted to higher values, the forward (from austenite to martensite) and reverse transitions became sharper and the width of the hysteresis increased in the SIM-aged sample. The energy distributions of acoustic hits showed similar behaviour to those of the quenched sample and the energy exponents, characterizing the power law behaviour, were also similar. For SIM-aged alloys at heating, in accordance with the sharper (burst-like) transition observed in the DSC run, few high-energy solitary hits were observed, and these hits did not fit to the energy distribution function fitted for smaller energies. Thus, these high-energy events were attributed to high sudden jumps in the phase transition during heating. The effect of long-range order (by applying a heat treatment at 573 K for 6 h to transform the B2 austenite to ordered L2<sub>1</sub> structure) and the SIM-aging on the transformation entropy was also investigated by DSC. It was found that the entropy was about 36% smaller after SIM-aging of the quenched sample and it was practically unchanged after austenite stabilization. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T20:20:51Z |
| publishDate | 2020-04-01 |
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| series | Metals |
| spelling | doaj.art-fdde5b389f47443c9d5abcf0ee4582c52023-11-19T22:14:47ZengMDPI AGMetals2075-47012020-04-0110453410.3390/met10040534Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single CrystalNora Mohareb Samy0Lajos Daróczi1László Zoltán Tóth2Elena Panchenko3Yury Chumlyakov4Nikita Surikov5Dezső László Beke6Department of Solid State Physics, University of Debrecen, P. O. Box 400, H-4002 Debrecen, HungaryDepartment of Solid State Physics, University of Debrecen, P. O. Box 400, H-4002 Debrecen, HungaryDepartment of Solid State Physics, University of Debrecen, P. O. Box 400, H-4002 Debrecen, HungarySiberian Physical Technical Institute, Tomsk State University, 634050 Tomsk, RussiaSiberian Physical Technical Institute, Tomsk State University, 634050 Tomsk, RussiaSiberian Physical Technical Institute, Tomsk State University, 634050 Tomsk, RussiaDepartment of Solid State Physics, University of Debrecen, P. O. Box 400, H-4002 Debrecen, HungarySimultaneous differential scanning calorimetry, DSC, and acoustic emission, AE, measurements were carried out for single crystals of quenched and stress-induced martensite stabilized (SIM-aged) shape memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> alloy. The transformation temperatures were shifted to higher values, the forward (from austenite to martensite) and reverse transitions became sharper and the width of the hysteresis increased in the SIM-aged sample. The energy distributions of acoustic hits showed similar behaviour to those of the quenched sample and the energy exponents, characterizing the power law behaviour, were also similar. For SIM-aged alloys at heating, in accordance with the sharper (burst-like) transition observed in the DSC run, few high-energy solitary hits were observed, and these hits did not fit to the energy distribution function fitted for smaller energies. Thus, these high-energy events were attributed to high sudden jumps in the phase transition during heating. The effect of long-range order (by applying a heat treatment at 573 K for 6 h to transform the B2 austenite to ordered L2<sub>1</sub> structure) and the SIM-aging on the transformation entropy was also investigated by DSC. It was found that the entropy was about 36% smaller after SIM-aging of the quenched sample and it was practically unchanged after austenite stabilization.https://www.mdpi.com/2075-4701/10/4/534shape memory alloysstress-induced martensite stabilizationacoustic emissiontransformation entropy |
| spellingShingle | Nora Mohareb Samy Lajos Daróczi László Zoltán Tóth Elena Panchenko Yury Chumlyakov Nikita Surikov Dezső László Beke Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single Crystal Metals shape memory alloys stress-induced martensite stabilization acoustic emission transformation entropy |
| title | Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single Crystal |
| title_full | Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single Crystal |
| title_fullStr | Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single Crystal |
| title_full_unstemmed | Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single Crystal |
| title_short | Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni<sub>51</sub>Fe<sub>18</sub>Ga<sub>27</sub>Co<sub>4</sub> Single Crystal |
| title_sort | effect of stress induced martensite stabilization on acoustic emission characteristics and the entropy of martensitic transformation in shape memory ni sub 51 sub fe sub 18 sub ga sub 27 sub co sub 4 sub single crystal |
| topic | shape memory alloys stress-induced martensite stabilization acoustic emission transformation entropy |
| url | https://www.mdpi.com/2075-4701/10/4/534 |
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