The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single Crystals
Heat treatments of single crystals of Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> (at.%) shape memory alloys cause various microstructures of the high-temperature phase. The nanodomain structure, consisting of regions of the L2<sub&...
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MDPI AG
2022-11-01
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| author | Ekaterina E. Timofeeva Elena Yu. Panchenko Maria V. Zherdeva Aida B. Tokhmetova Nikita Yu. Surikov Yuriy I. Chumlyakov Ibrahim Karaman |
| author_facet | Ekaterina E. Timofeeva Elena Yu. Panchenko Maria V. Zherdeva Aida B. Tokhmetova Nikita Yu. Surikov Yuriy I. Chumlyakov Ibrahim Karaman |
| author_sort | Ekaterina E. Timofeeva |
| collection | DOAJ |
| description | Heat treatments of single crystals of Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> (at.%) shape memory alloys cause various microstructures of the high-temperature phase. The nanodomain structure, consisting of regions of the L2<sub>1</sub>- and B2-phases, and nanosized particles are the main parameters that change during heat treatments and determine the mechanism of nucleation and growth of martensite crystals, the size of thermal-induced martensite lamellae, the temperature M<sub>s</sub>, and the temperature intervals of the martensitic transformation. In the as-grown single crystals, the high-temperature phase has only the L2<sub>1</sub>-structure and the MT occurs at low (M<sub>s</sub> = 125 K) temperatures due to the motion of the practically single interphase boundary in narrow temperature ranges of 3–7 K. The reduction in the volume fraction of the L2<sub>1</sub>-phase to 40% and the formation of nanodomains (20–50 nm) of the L2<sub>1</sub>-and B2-phases due to annealing at 1448 K for 1 h with quenching causes an increase in the MT temperatures by 80 K. The MT occurs in wide temperature ranges of 40–45 K because of multiple nucleation of individual large (300–500 µm) martensite lamellae and their growth. After aging at 773 K for 1 h, the precipitation of nanosized particles of the ω-phase in such a structure additionally increases the MT temperatures by 45 K. The MT occurs due to the multiple nucleation of packets of small (20–50 μm) martensite lamellae. |
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| issn | 2075-4701 |
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| last_indexed | 2024-03-09T18:09:20Z |
| publishDate | 2022-11-01 |
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| spelling | doaj.art-da801c560bb744a6a2a873b3dca91e8e2023-11-24T09:14:34ZengMDPI AGMetals2075-47012022-11-011211196010.3390/met12111960The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single CrystalsEkaterina E. Timofeeva0Elena Yu. Panchenko1Maria V. Zherdeva2Aida B. Tokhmetova3Nikita Yu. Surikov4Yuriy I. Chumlyakov5Ibrahim Karaman6Laboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, RussiaDepartment of Materials Science & Engineering, Texas A&M University, College Station, TX 77843, USAHeat treatments of single crystals of Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> (at.%) shape memory alloys cause various microstructures of the high-temperature phase. The nanodomain structure, consisting of regions of the L2<sub>1</sub>- and B2-phases, and nanosized particles are the main parameters that change during heat treatments and determine the mechanism of nucleation and growth of martensite crystals, the size of thermal-induced martensite lamellae, the temperature M<sub>s</sub>, and the temperature intervals of the martensitic transformation. In the as-grown single crystals, the high-temperature phase has only the L2<sub>1</sub>-structure and the MT occurs at low (M<sub>s</sub> = 125 K) temperatures due to the motion of the practically single interphase boundary in narrow temperature ranges of 3–7 K. The reduction in the volume fraction of the L2<sub>1</sub>-phase to 40% and the formation of nanodomains (20–50 nm) of the L2<sub>1</sub>-and B2-phases due to annealing at 1448 K for 1 h with quenching causes an increase in the MT temperatures by 80 K. The MT occurs in wide temperature ranges of 40–45 K because of multiple nucleation of individual large (300–500 µm) martensite lamellae and their growth. After aging at 773 K for 1 h, the precipitation of nanosized particles of the ω-phase in such a structure additionally increases the MT temperatures by 45 K. The MT occurs due to the multiple nucleation of packets of small (20–50 μm) martensite lamellae.https://www.mdpi.com/2075-4701/12/11/1960martensitic transformationssuperelasticitysingle crystalsmicrostructure |
| spellingShingle | Ekaterina E. Timofeeva Elena Yu. Panchenko Maria V. Zherdeva Aida B. Tokhmetova Nikita Yu. Surikov Yuriy I. Chumlyakov Ibrahim Karaman The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single Crystals Metals martensitic transformations superelasticity single crystals microstructure |
| title | The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single Crystals |
| title_full | The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single Crystals |
| title_fullStr | The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single Crystals |
| title_full_unstemmed | The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single Crystals |
| title_short | The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni<sub>44</sub>Fe<sub>19</sub>Ga<sub>27</sub>Co<sub>10</sub> Single Crystals |
| title_sort | effect of thermal treatment on microstructure and thermal induced martensitic transformations in ni sub 44 sub fe sub 19 sub ga sub 27 sub co sub 10 sub single crystals |
| topic | martensitic transformations superelasticity single crystals microstructure |
| url | https://www.mdpi.com/2075-4701/12/11/1960 |
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