Search for transformation from paramagnetic martensite to ferromagnetic austenite: NiMnGaCu alloys

Jiang, Chengbao; Wang, Jingmin; Li, Pan-Pan; Jia, Ao; Xu, Huibin

doi:10.1063/1.3155199

Cited by 53 publications

(54 citation statements)

References 14 publications

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“…Moreover, the Curie temperature of the martensite phase (T C,M ) is slightly higher or almost equal to the Curie temperature of the parent phase (T C,P ), and the ΔM in the vicinity of martensitic transformation temperature (T M s ) is very small. Similar phase diagrams can be found for Ni-Mn-Ga systems such as in Ni 2+x Mn 1−x Ga [30][31][32] and other sections [33,34] [36], Ni-Mn-Ga-Cu [37][38][39], and Ni-Mn-Ga-Fe [40,41] systems also show similar behaviors, and a magnetically coupled structural transition, i.e., a direct transition from region I to region IV, can be found in a wide range of compositions.…”

Section: Introductionsupporting

confidence: 54%

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Kainuma

Kihara

et al. 2015

MATEC Web of Conferences

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Abstract. We herein present a review of recent thermodynamic and kinetic studies on Ni-Mn-based magnetic shape memory alloys along with some new data supporting the kinetic discussion. Magnetic phase diagrams and Clausius-Clapeyron relationships are mainly discussed for Ni-Mn-Ga and Ni-Mn-In systems. For the kinetics, a phenomenological model based on Seeger's model is used to describe the temperature dependence of magnetic field hysteresis, as well as the change of hysteresis under different sweeping rates of magnetic fields.

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Section: Introductionsupporting

confidence: 54%

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Kainuma

Kihara

et al. 2015

MATEC Web of Conferences

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“…Doping Co in Ni-Mn-Y alloys (Y = Ga, In, Sn, Sb) reportedly improves the response sensitivity of the phase transition temperature from ferromagnetic (FM) austenite (Aust) to antiferromagnetic (AFM) martensite (Mart) to an external magnetic field [9]. Similar alloys, including Ni-Co-Mn-In [10], Ni-Co-Mn-Sn [11], Ni-Co-Mn-Sb [12], Ni-Co-Mn-Ga [13] and their Cu-coped counterparts [14][15][16], have been investigated for their magnetocaloric effect.…”

Section: Introductionmentioning

confidence: 97%

A phase-field model of phase transitions and domain structures of NiCoMnIn metamagnetic alloys

Huang

Wang

et al. 2015

Acta Materialia

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“…Previously we have intensively studied the martensitic transformation in Ni-Mn-Ga alloys. [12][13][14] We have also studied the solidification behaviors of Ni-Mn-Ga alloys. [15,16] For this article, we investigated the solid-state transformations of Ni-Mn-Ga in the planar and cellular solidification morphologies, respectively.…”

mentioning

confidence: 99%

Correlation between solid-state transformations and solidification in Ni-Mn-Ga alloys

Liu

Wang

Jiang

et al. 2011

Metall Mater Trans A

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The influence of solidification morphologies, planar and cellular, on the solid-state transformations, martensitic and premartensitic transformations, was studied, respectively, for Ni-Mn-Ga martensitic materials. The martensitic transformation was observed in both planar and cellular morphologies, but the premartensitic transformation was suppressed in the cellular morphology. Moreover, after homogenization, the premartensitic transformation was monitored again. The correlation between the solidification and the solid-state transformation is revealed. The chemical disorder during solidification is considered to understand this correlation.Martensitic materials ranging from single-element metals and alloys to ceramics have formed a unique group of functional materials. [1,2] Novel physical functions have been obtained in martensitic materials as a result of their solid-state transformations, i.e., martensitic transformation (MT) and premartensitic transformation (PMT). [3,4] Effectively controlling the MT and PMT is essential for realizing the expected physic functions. Previous studies of martensitic materials mainly focus on the MT and PMT behaviors, including the effects of chemical components and bias fields (stress, magnetic, electrical, etc). [5][6][7][8] Prior to the PMT and MT, another typical first-order phase transformation, solidification, usually takes place. It has been well known that solidification drastically influences the properties of materials by controlling the morphologies, including planar, cellular, and dendrite. [9] The solidification morphology is a major issue for solidification studies when improving the mechanical or physical properties. [10] Up to present, both types of first-order phase transformations, the solid-state transformations and the solidification, were mainly studied in their respective separate fields. However, the relationship between the solid-state transformation and the solidification has been ignored in the long term.The ferromagnetic shape memory alloys (FSMAs) Ni-Mn-Ga, an attractive martensitic material developed since 1996, [11] have drawn lots of attention. Previously we have intensively studied the martensitic transformation in Ni-Mn-Ga alloys. [12][13][14] We have also studied the solidification behaviors of Ni-Mn-Ga alloys. [15,16] For this article, we investigated the solid-state transformations of Ni-Mn-Ga in the planar and cellular solidification morphologies, respectively. The correlation between the two types of first-order phase transformations was revealed. This is of great significance for understanding the nature and functionalities of martensitic materials, and for adjusting the transformations to get optimized or unexpected functions.High purity elements Ni (99.98 pct), Mn (99.9 pct), and Ga (99.99 pct) were arc melted into buttons for four times under argon atmosphere, and then they were dropped cast into a chilled copper mold to obtain nominal composition Ni 50.5 Mn 25 Ga 24.5 (at. pct) master rods of B 7 mm 9 100 mm. Directional solidification ...

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Search for transformation from paramagnetic martensite to ferromagnetic austenite: NiMnGaCu alloys

Cited by 53 publications

References 14 publications

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

A phase-field model of phase transitions and domain structures of NiCoMnIn metamagnetic alloys

Correlation between solid-state transformations and solidification in Ni-Mn-Ga alloys

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