Magnetic Properties of FeNiCoAlTiNb Shape Memory Alloys
The magnetic properties of the new Fe<sub>41</sub>Ni<sub>28</sub>Co<sub>17</sub>Al<sub>11.5</sub>(Ti+Nb)<sub>2.5</sub> (at. %) shape memory alloy system were studied in this work. The magnetic properties were characterized by thermo-magneti...
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MDPI AG
2022-01-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/1/121 |
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| author | Chau-Yi Tsai Li-Wei Tseng Yu-Chih Tzeng Po-Yu Lee |
| author_facet | Chau-Yi Tsai Li-Wei Tseng Yu-Chih Tzeng Po-Yu Lee |
| author_sort | Chau-Yi Tsai |
| collection | DOAJ |
| description | The magnetic properties of the new Fe<sub>41</sub>Ni<sub>28</sub>Co<sub>17</sub>Al<sub>11.5</sub>(Ti+Nb)<sub>2.5</sub> (at. %) shape memory alloy system were studied in this work. The magnetic properties were characterized by thermo-magnetization and a vibrating sample magnetometer (VSM). In iron-based shape memory alloys, aging heat treatment is crucial for obtaining the properties of superelasticity and shape memory. In this study, we focus on the magnetization, martensitic transformation temperatures, and microstructure of this alloy during the aging process at 600 °C. From the X-ray diffraction (XRD) results, the new peak γ’ is presented during the aging process. The intensity of this new peak (γ’) increases with the aging time, while the intensity of the FCC (111) austenite peak decreases with aging time. Transmission electron microscope (TEM) results show that the size of the precipitate increases with increasing the aging times from 24 to 72 h. Thermo-magnetization results show that: (1) phase transformation is observed when the aging time is at least 24 h, (2) the transformation temperature increases with the aging time, (3) transformation temperatures tend to increase while the magnetic field increases from 0.05 to 7 Tesla, and (4) the magnetization saturates after aging time reaches 24 h. Vibrating sample magnetometer (VSM) results show that thermal process was found to significantly affect the magnetic properties of this alloy, especially on saturated magnetic magnetization and magnetic moment reversal behavior. |
| first_indexed | 2024-03-10T01:40:48Z |
| format | Article |
| id | doaj.art-dd8887321a3f4ad281b504ffa9ba5b7a |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T01:40:48Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-dd8887321a3f4ad281b504ffa9ba5b7a2023-11-23T13:25:34ZengMDPI AGCrystals2073-43522022-01-0112112110.3390/cryst12010121Magnetic Properties of FeNiCoAlTiNb Shape Memory AlloysChau-Yi Tsai0Li-Wei Tseng1Yu-Chih Tzeng2Po-Yu Lee3Department of Materials Science and Engineering, National Formosa University, Yunlin 632301, TaiwanDepartment of Mechatronics Engineering, National Changhua University of Education, Changhua 50007, TaiwanDepartment of Power Vehicle and Systems Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan City 33550, TaiwanDepartment of Mechatronics Engineering, National Changhua University of Education, Changhua 50007, TaiwanThe magnetic properties of the new Fe<sub>41</sub>Ni<sub>28</sub>Co<sub>17</sub>Al<sub>11.5</sub>(Ti+Nb)<sub>2.5</sub> (at. %) shape memory alloy system were studied in this work. The magnetic properties were characterized by thermo-magnetization and a vibrating sample magnetometer (VSM). In iron-based shape memory alloys, aging heat treatment is crucial for obtaining the properties of superelasticity and shape memory. In this study, we focus on the magnetization, martensitic transformation temperatures, and microstructure of this alloy during the aging process at 600 °C. From the X-ray diffraction (XRD) results, the new peak γ’ is presented during the aging process. The intensity of this new peak (γ’) increases with the aging time, while the intensity of the FCC (111) austenite peak decreases with aging time. Transmission electron microscope (TEM) results show that the size of the precipitate increases with increasing the aging times from 24 to 72 h. Thermo-magnetization results show that: (1) phase transformation is observed when the aging time is at least 24 h, (2) the transformation temperature increases with the aging time, (3) transformation temperatures tend to increase while the magnetic field increases from 0.05 to 7 Tesla, and (4) the magnetization saturates after aging time reaches 24 h. Vibrating sample magnetometer (VSM) results show that thermal process was found to significantly affect the magnetic properties of this alloy, especially on saturated magnetic magnetization and magnetic moment reversal behavior.https://www.mdpi.com/2073-4352/12/1/121shape memory alloysFeNiCoAlTiNbmagnetic propertytransformation temperaturesaging heat treatment |
| spellingShingle | Chau-Yi Tsai Li-Wei Tseng Yu-Chih Tzeng Po-Yu Lee Magnetic Properties of FeNiCoAlTiNb Shape Memory Alloys Crystals shape memory alloys FeNiCoAlTiNb magnetic property transformation temperatures aging heat treatment |
| title | Magnetic Properties of FeNiCoAlTiNb Shape Memory Alloys |
| title_full | Magnetic Properties of FeNiCoAlTiNb Shape Memory Alloys |
| title_fullStr | Magnetic Properties of FeNiCoAlTiNb Shape Memory Alloys |
| title_full_unstemmed | Magnetic Properties of FeNiCoAlTiNb Shape Memory Alloys |
| title_short | Magnetic Properties of FeNiCoAlTiNb Shape Memory Alloys |
| title_sort | magnetic properties of fenicoaltinb shape memory alloys |
| topic | shape memory alloys FeNiCoAlTiNb magnetic property transformation temperatures aging heat treatment |
| url | https://www.mdpi.com/2073-4352/12/1/121 |
| work_keys_str_mv | AT chauyitsai magneticpropertiesoffenicoaltinbshapememoryalloys AT liweitseng magneticpropertiesoffenicoaltinbshapememoryalloys AT yuchihtzeng magneticpropertiesoffenicoaltinbshapememoryalloys AT poyulee magneticpropertiesoffenicoaltinbshapememoryalloys |