P-phase precipitation and its effect on martensitic transformation in (Ni,Pt)Ti shape memory alloys

Gao, Yipeng; Zhou, Ning; Yang, Fan; Cui, Yu‐Sheng; Kovařík, Libor; Hatcher, Nicholas; Noebe, Ronald D.; Mills, Michael J.; Wang, Y.

doi:10.1016/j.actamat.2011.11.043

Cited by 53 publications

(34 citation statements)

References 42 publications

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“…Similar experimental phenomena are also observed in some high temperature shape memory alloy systems, 11,12 whose phase diagrams may also be explained by our proposed model. In this study, ingots of NCATB alloys were prepared using arc melting under an argon atmosphere.…”

supporting

confidence: 87%

Phase diagram of FeNiCoAlTaB ferrous shape memory alloy on aging time

2017

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Ferrous shape memory alloy, Fe41Ni28Co17Al11.5Ta2.5B0.05, has shown large superelastic strain and strength in previous study. In the fabrication of this alloy, aging process is crucial for the formation of shape memory effect/superelasticity. However, its phase evolution on aging time is not clearly known. In this study, we systematically studied the phase diagram of this alloy on aging time. It is found that the unaged alloy shows a strain glass transition. With the aging time proceeding, the martensitic transformation gradually emerges. The phase diagram can be explained by the formation of coherent precipitates induced by aging. The heterogeneous strain between coherent precipitates and matrix is the driving force responsible for the emerging martensitic transformation. The generic explanation is supposed to be useful in martensitic transformation engineering for developing novel shape memory alloys from non-transforming materials.

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supporting

confidence: 87%

Phase diagram of FeNiCoAlTaB ferrous shape memory alloy on aging time

2017

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“…Subsequent to this report, Sasaki et al [11] reported the same phase in a Ni-Ti-Pd SMA. In both systems, the precipitate was Ni-rich relative to the matrix and formed coherent/semi-coherent interfaces, which provided the necessary compositional alterations and strain that raised the transformation temperatures above 100 o C [12]. Unfortunately, these types of precious metal additions are cost-prohibitive for developing alloys for wide-spread bulk applications.…”

Section: Introductionmentioning

confidence: 98%

Structure–property relationships in a precipitation strengthened Ni–29.7Ti–20Hf (at%) shape memory alloy

Hornbuckle

Sasaki

Bigelow

et al. 2015

Materials Science and Engineering: A

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“…The limited growth of the single P-phase grains is believed to be due to sluggish diffusivity considering this phase has a 24 atom unit cell where each atom type has a specific lattice occupancy [23,24,45]. Faults are also evident in many of the grains, which are associated with the possible stacking variants present in the P-phase [28,46].…”

Section: Resultsmentioning

confidence: 97%

“…In this study, we systematically vary the ratio of Ni and Pd in a series of Ti 11 (Ni þ Pd) 13 alloys, maintaining (Ni þ Pd) in a constant stoichiometric ratio to Ti to determine the compositional stability for an isothermal aging condition. The results of this study and previous studies [23,26,28,41] can begin to provide the data necessary to map the phase equilibrium for the P-phase and related phases.…”

Section: Introductionmentioning

confidence: 87%