Effects of annealing on softening and hardening behaviors of 60NiTi alloy
60NiTi alloy is an important biomedical, structural and functional material. In this paper, the effects of heat treatment (temperature, time and cooling rate) on the microstructure and properties of 60NiTi alloy were studied, and the softening and hardening mechanisms were revealed. The results show...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422016325 |
| _version_ | 1797980264457043968 |
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| author | Gengyan Liu Dong Chen Fei Tan Kerui Song Yanbin Jiang Yanlin Jia Zhu Xiao Zhou Li |
| author_facet | Gengyan Liu Dong Chen Fei Tan Kerui Song Yanbin Jiang Yanlin Jia Zhu Xiao Zhou Li |
| author_sort | Gengyan Liu |
| collection | DOAJ |
| description | 60NiTi alloy is an important biomedical, structural and functional material. In this paper, the effects of heat treatment (temperature, time and cooling rate) on the microstructure and properties of 60NiTi alloy were studied, and the softening and hardening mechanisms were revealed. The results showed that the number of Ni4Ti3 phase enhanced with an increase of the cooling rate and the precipitation of Ni3Ti phase was inhibited after annealing at 950∼1075 °C followed by water-cooling. The orientation relationship between NiTi matrix and Ni4Ti3 phase obey the rule: [111]NiTi//[0001]Ni4Ti3 and (123¯)NiTi//(112¯0)Ni4Ti3. The faster the cooling rate was, the higher the hardness of the alloy was. The hardness of alloy under different cooling rate ranked from high to low was water-cooling, oil-cooling, liquid nitrogen-cooling, air-cooling and furnace-cooling. The hardness of the 60NiTi alloy was 316 HV after annealing at 1075 °C for 4 h followed by furnace-cooling, and the hardness sharply increased to 669 HV after annealing at 1075 °C for 4 h followed by water-cooling. The phase transformation of Ni4Ti3→Ni3Ti during cooling mainly contributed to the hardness decrease of the 60NiTi alloy. |
| first_indexed | 2024-04-11T05:51:48Z |
| format | Article |
| id | doaj.art-18f41940869c4eeea464749e771c0cf4 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-11T05:51:48Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-18f41940869c4eeea464749e771c0cf42022-12-22T04:42:01ZengElsevierJournal of Materials Research and Technology2238-78542022-11-012132203234Effects of annealing on softening and hardening behaviors of 60NiTi alloyGengyan Liu0Dong Chen1Fei Tan2Kerui Song3Yanbin Jiang4Yanlin Jia5Zhu Xiao6Zhou Li7The Third Xiangya Hospital, Central South University, Changsha 410000, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, China; Corresponding author.School of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, China; State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China; Corresponding author.School of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, China; State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, China; State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China60NiTi alloy is an important biomedical, structural and functional material. In this paper, the effects of heat treatment (temperature, time and cooling rate) on the microstructure and properties of 60NiTi alloy were studied, and the softening and hardening mechanisms were revealed. The results showed that the number of Ni4Ti3 phase enhanced with an increase of the cooling rate and the precipitation of Ni3Ti phase was inhibited after annealing at 950∼1075 °C followed by water-cooling. The orientation relationship between NiTi matrix and Ni4Ti3 phase obey the rule: [111]NiTi//[0001]Ni4Ti3 and (123¯)NiTi//(112¯0)Ni4Ti3. The faster the cooling rate was, the higher the hardness of the alloy was. The hardness of alloy under different cooling rate ranked from high to low was water-cooling, oil-cooling, liquid nitrogen-cooling, air-cooling and furnace-cooling. The hardness of the 60NiTi alloy was 316 HV after annealing at 1075 °C for 4 h followed by furnace-cooling, and the hardness sharply increased to 669 HV after annealing at 1075 °C for 4 h followed by water-cooling. The phase transformation of Ni4Ti3→Ni3Ti during cooling mainly contributed to the hardness decrease of the 60NiTi alloy.http://www.sciencedirect.com/science/article/pii/S223878542201632560NiTi alloyHeat treatmentHardening behaviorSoftening behavior |
| spellingShingle | Gengyan Liu Dong Chen Fei Tan Kerui Song Yanbin Jiang Yanlin Jia Zhu Xiao Zhou Li Effects of annealing on softening and hardening behaviors of 60NiTi alloy Journal of Materials Research and Technology 60NiTi alloy Heat treatment Hardening behavior Softening behavior |
| title | Effects of annealing on softening and hardening behaviors of 60NiTi alloy |
| title_full | Effects of annealing on softening and hardening behaviors of 60NiTi alloy |
| title_fullStr | Effects of annealing on softening and hardening behaviors of 60NiTi alloy |
| title_full_unstemmed | Effects of annealing on softening and hardening behaviors of 60NiTi alloy |
| title_short | Effects of annealing on softening and hardening behaviors of 60NiTi alloy |
| title_sort | effects of annealing on softening and hardening behaviors of 60niti alloy |
| topic | 60NiTi alloy Heat treatment Hardening behavior Softening behavior |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422016325 |
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