Effect of aging on the phase transformation and mechanical behavior of Ti36Ni49Hf15 high temperature shape memory alloy

Meng, Xianglong; Zheng, Yufeng; Wang, Z; Zhao, Liancheng

doi:10.1016/s1359-6462(99)00347-4

Cited by 94 publications

(36 citation statements)

References 10 publications

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“…The results show that, contrary to the cast alloy, hot-rolled Ni 49 Ti 36 Hf 15 can be used as a high-temperature shape memory alloy. Hot rolling significantly improves the microstructure via annihilation of the microstructural voids and uniform distribution of the (Ti,Hf) 2 Ni second phase, resulting in a recovery of 5.61 of 6.25 deformation strain for the 45% hot-rolled alloy.…”

Section: Discussionmentioning

confidence: 97%

Effect of Aging on the Microstructure and Shape Memory Effect of a Hot-Rolled NiTiHf Alloy

Javadi

Belbasi

Salehi

et al. 2011

J. of Materi Eng and Perform

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In this article, the effect of aging on the microstructure and shape memory effect (SME) of a hot-rolled Ni 49 Ti 36 Hf 15 alloy is studied. The alloy was prepared by vacuum induction melting (VIM) and homogenized at 1000°C for 2 h. The homogenized alloy was then undergone 45% hot rolling at 850°C and aging at temperatures of 500 and 600°C for 2 h. Optical microscopy (OM) and scanning electron microscopy (SEM) conducted on the hot-rolled samples revealed that hot rolling improves microstructure, deformation, and recoverable strains such that the alloy recovers 3.10 of 3.23 and 5.61 of 6.25 strain in the homogenized and hot-rolled state, respectively. Aging, however, adversely affects the formability and SME of the alloy, which stems from the embrittling effect of the newly formed precipitates during the aging process.

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Section: Discussionmentioning

confidence: 97%

Effect of Aging on the Microstructure and Shape Memory Effect of a Hot-Rolled NiTiHf Alloy

Javadi

Belbasi

Salehi

et al. 2011

J. of Materi Eng and Perform

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“…Вместе с тем легирование гафнием сплавов никелида титана уже при замещении титана от 10 до 30 at.% в обеспечивает, как извествно, увеличение температур ТМП B2 ↔ B19 ′ вплоть до 870 K [9][10][11][12][13]. Еще одним важ-ным отличием легирования гафнием в концентрациях, превышающих 15 at.%, является, как и в случае легиро-вания медью, возможность получить данные сплавы на основе никелида титана в аморфном состоянии [14][15][16][17][18].…”

Section: (поступило в редакцию 16 июня 2016 г в окончательной редакцunclassified

Тонкая структура и физико-механические свойства сплава с памятью формы Ni-=SUB=-50-=/SUB=-Ti-=SUB=-32-=/SUB=-Hf-=SUB=-18-=/SUB=- после быстрой закалки спиннингованием

Куранова¹,

Пушин²,

Уксусников³

et al. 2017

Журнал Технической Физики

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Представлены результаты исследования структуры, химического и фазового составов аморфного сплава Ni 50 Ti 32 Hf 18 , полученного быстрой закалкой струи расплава спиннингованием и подвергнутого термообра-боткам. Методами трансмиссионной и сканирующей электронной микроскопии и химического микроанализа, дифракции электронов и рентгенодифрактометрии изучены особенности формирования мелкозернистой поликристаллической структуры сплава в зависимости от режимов термообработки. По данным темпера-турного поведения электросопротивления определены критические температуры их расстекловывания и последующего термоупругого мартенситного превращения B2 → B19 ′ . Изучены механические свойства в зависимости от режимов термообработки.

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“…Hf/Zr)-rich compositions since they exhibit relatively high transformation temperatures [20][21][22][23][24][25][26][27]. However, numerous disadvantages such as low recoverable and transformation strains, poor thermal and dimensional stability, large hysteresis, brittleness, and reduced workability lead to poor shape memory behavior and lack of a superelastic response in these alloys.…”

Section: Ni-ti-hf/zr Alloysmentioning

confidence: 99%

Effect of Thermal Treatments on Ni–Mn–Ga and Ni-Rich Ni–Ti–Hf/Zr High-Temperature Shape Memory Alloys

Santamarta

Evirgen

Pérez-Sierra

et al. 2015

Shap. Mem. Superelasticity

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Among all the promising high-temperature shape memory alloys (HTSMAs), the Ni-Mn-Ga and the Ni-Ti-Hf/Zr systems exhibit interesting shape memory and superelastic properties that may place them in a good position for potential applications. The present work shows that thermal treatments play a crucial role in controlling the martensitic phase transformation characteristics of both systems, but in different ways. On one hand, the equilibrium phase diagram of the Ni-Mn-Ga family allows selecting compositions with high transformation temperatures and outstanding thermal stability at relatively high temperatures in air, showing no significant changes in the transformation behavior for continuous aging up to *5 years at 500°C. Moreover, the excellent thermal stability correlates with a good thermal cyclic stability and an exceptional oxidation resistance of the parent phase. On the other hand, precipitation processes controlled by thermal treatments are needed to manipulate the transformation temperatures, mechanical properties, and thermal stability of Ni-rich Ni-Ti-Hf/Zr alloys to become HTSMAs. These changes in the functional properties are a consequence of the competition between the mechanical and compositional effects of the precipitates on the martensitic transformation.

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Effect of aging on the phase transformation and mechanical behavior of Ti36Ni49Hf15 high temperature shape memory alloy

Cited by 94 publications

References 10 publications

Effect of Aging on the Microstructure and Shape Memory Effect of a Hot-Rolled NiTiHf Alloy

Effect of Aging on the Microstructure and Shape Memory Effect of a Hot-Rolled NiTiHf Alloy

Тонкая структура и физико-механические свойства сплава с памятью формы Ni-=SUB=-50-=/SUB=-Ti-=SUB=-32-=/SUB=-Hf-=SUB=-18-=/SUB=- после быстрой закалки спиннингованием

Effect of Thermal Treatments on Ni–Mn–Ga and Ni-Rich Ni–Ti–Hf/Zr High-Temperature Shape Memory Alloys

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