Ti50Ni41Cu7Co2形狀記憶合金之麻田散體相變態行為與機械性質之研究

周大軒

doi:10.6342/NTU202300174

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Ti50Ni41Cu7Co2形状记忆合金之麻田散体相变态行为与机械性质之研究

Research on Martensitic Transformation Behaviors and Mechanical Properties of Ti50Ni41Cu7Co2 Shape Memory Alloy

周大轩 , 硕士　　导师：陈志轩　　

繁体中文 DOI： 10.6342/NTU202300174

形状记忆合金；应变玻璃；超弹性；弹热效应；退火； shape memory alloy ； strain glass ； psuedoelasticity ； elastocaloric effect ； annealing ； annealing ；

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摘要 │ 参考文献 (137) │ 国际计量

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This study investigated the influences of cold-rolling and annealing on martensitic transformation, pseudoelasticity, and elastocaloric effect of a Ti50Ni41Cu7Co2 shape memory alloy (SMA). After solution-treated at 1173K for 1 hour, the Ti50Ni41Cu7Co2 SMA showed evident irrecoverable strain when tensile stress of 366MPa was applied. Besides, rapid decay of shape recovery property was observed during tensile cycles. As a result, only a narrow temperature range of 25K was available for pseudoelasticity and elastocaloric effect. To strengthen the material and broaden the temperature range of pseudoelasticity and elastocaloric effect, the solution-treated Ti50Ni41Cu7Co2 SMA was cold-rolled to 50% thickness reduction. A large number of dislocations were introduced during the cold rolling process, which suppressed the martensitic transformation. Therefore, the Ti50Ni41Cu7Co2 became a strain glass that exhibited pseudoelasticity and elastocaloric effect at a temperature range of 200K. The stability of tensile cycles was also improved. It was noted that the dislocations suppressed the martensitic transformation and thus reduced the latent heat of transformation, causing small elastocaloric temperature changes. To increase the elastocaloric cooling effect, the cold-rolled Ti50Ni41Cu7Co2 SMA was annealed at 573K for 30 minutes and 673K for 5 minutes for recrystallization, which resulted in grain sizes of 16nm and 40nm, respectively. The fine-grained Ti50Ni41Cu7Co2 SMAs remained highly strengthened and exhibited stable pseudoelasticity during cyclic deformation. Furthermore, the Ti50Ni41Cu7Co2 SMAs annealed at 573 K and 673K showed elastocaloric cooling of -5.6K and -8.5K, respectively.

参考文献 ( 137 ) 〈TOP〉

Mota-Babiloni, A., et al., Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA. Renewable and Sustainable Energy Reviews, 2017. 80: p. 1031-1042.
Shi, J., et al., Electrocaloric cooling materials and devices for zero-global-warming-potential, high-efficiency refrigeration. Joule, 2019. 3(5): p. 1200-1225.
Bonnot, E., et al., Elastocaloric effect associated with the martensitic transition in shape-memory alloys. Physical review letters, 2008. 100(12): p. 125901.
Moya, X., S. Kar-Narayan, and N.D. Mathur, Caloric materials near ferroic phase transitions. Nature materials, 2014. 13(5): p. 439-450.
Schmidt, M., A. Schütze, and S. Seelecke, Scientific test setup for investigation of shape memory alloy based elastocaloric cooling processes. International Journal of Refrigeration, 2015. 54: p. 88-97.

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引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。