Strain glass versus antisite disorder induced ferromagnetic state in Fe doped Ni–Mn–In Heusler martensites

Nevgi, R.; Priolkar, K. R.; Acet, Mehmet

doi:10.1088/1361-6463/abe3b0

Cited by 6 publications

(3 citation statements)

References 27 publications

(35 reference statements)

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“…The ferroelastic/martensitic to strain glass transition usually occurs due to the formation of point defects when the dopant concentration exceeds a critical value [28]. Segregation of defect phases in such impurity-doped alloys destroys the longrange ordering of the elastic strain vector, driving the system to a nonergodic ground state [29,30]. Despite doping an impurity like In for Mn in NiMn martensitic alloy, a transition to the strain glassy state is not reported in Ni 2 Mn 2−y Z y alloys.…”

Section: Introductionmentioning

confidence: 99%

Randomly packed Ni2MnIn and NiMn structural units in off-stoichiometric Ni2Mn2−y

2021

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Ni 2 Mn 2−y In y alloys transform from the martensitic L1 0 antiferromagnetic ground state near y = 0 to the austenitic ferromagnetic L2 1 Heusler phase near y = 1 due to doping of In impurity for Mn. The offstoichiometric alloys prepared by rapid quenching are structurally metastable and dissociate into a mixture of L2 1 (Ni 2 MnIn) and L1 0 (NiMn) phases upon temper annealing. Despite this structural disintegration, the martensitic transformation temperature remains invariant in the temper annealed alloys. Investigations of the local structure of the constituent atoms reveal the presence of strongly coupled Ni 2 MnIn and NiMn structural units in the temper annealed as well as the rapidly quenched off-stoichiometric Ni 2 Mn 2−y In y alloys irrespective of their crystal structure. This random packing of the L2 1 and L1 0 structural units seems to be responsible for invariance of martensitic transition temperature in the temper annealed alloys as well as the absence of strain glass transition in rapidly quenched alloys.

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Section: Introductionmentioning

confidence: 99%

Randomly packed Ni2MnIn and NiMn structural units in off-stoichiometric Ni2Mn2−y

2021

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“…Since their discovery in 2005, many strain glass systems have been reported, including point defect-doped TiNi (25,26,34,35), TiNb (6), TiPd (36)(37)(38), TiAu (39), FeMnGa (40), NiCoGa (41), and NiMnIn (42), as well as SMAs with densely populated nanoscale precipitates (27,28) or that are heavily cold worked (29,30). According to the characteristics of a strain glass state and a strain glass transition mentioned above, a strain glass system can be identified by the following four pieces of experimental evidence to show (a) the existence of nano-sized martensitic domains by transmission electron microscopy (TEM) observations, (b) frequency dispersion of the storage modulus following Vogel-Fulcher relation from DMA, (c) invariance of average structure from XRD or disappearance of phase transition peak from DSC, and (d) continuous loss of ergodicity upon cooling from mechanical zero-field cooling/field cooling testing (Figure 3).…”

Section: Figurementioning

confidence: 99%

Strain Glass State, Strain Glass Transition, and Controlled Strain Release

Wang

Ren

2022

Annu. Rev. Mater. Res.

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Strain glass is a new strain state discovered recently in ferroelastic systems that is characterized by nanoscale martensitic domains formed through a freezing transition. These nanodomains typically have mottled or tweed morphology depending on the elastic anisotropy of the system. Strain glass transition is a broadly smeared and high order–like transition, taking place within a wide temperature or stress range. It is accompanied by many unique properties, including linear superelasticity with high strength, low modulus, Invar and Elinvar anomalies, and large magnetostriction. In this review, we first discuss experimental characterization and testing that have led to the discovery of the strain glass transition and its unique properties. We then introduce theoretical models and computer simulations that have shed light on the origin and mechanisms underlying the unique characteristics and properties of strain glass transitions. Unresolved issues and challenges in strain glass study are also addressed. Strain glass transition can offer giant elastic strain and ultralow elastic modulus by well-controlled reversible structural phase transformations through defect engineering. Expected final online publication date for the Annual Review of Materials Research, Volume 52 is July 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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“…The ferroelastic/martensitic to strain glass transition usually occurs due to the formation of point defects when the dopant concentration exceeds a critical value [28]. Segregation of defect phases in such impurity-doped alloys destroy the long-range ordering of the elastic strain vector, driving the system to a non-ergodic ground state [29,30]. Despite doping an impurity like In for Mn in NiMn martensitic alloy, a transition to strain glassy state is not reported in Ni 2 Mn 2−y Z y alloys.…”

Section: Introductionmentioning

confidence: 99%

Randomly packed Ni$_2$MnIn and NiMn structural units in off stoichiometric Ni$_2$Mn$_{2-y}$In$_y$ alloys

Nevgi,

Dias,

Priolkar

2021

Preprint

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Ni 2 Mn 2−y In y alloys transform from the martensitic L1 0 antiferromagnetic ground state near y = 0 to austenitic ferromagnetic L2 1 Heusler phase near y = 1 due to doping of In impurity for Mn. The off stoichiometric alloys prepared by rapid quenching are structurally metastable and dissociate into a mixture of L2 1 (Ni 2 MnIn) and L1 0 (NiMn) phases upon temper annealing. Despite this structural disintegration, the martensitic transformation temperature remains invariant in the temper annealed alloys. Investigations of the local structure of the constituent atoms reveal the presence of strongly coupled Ni 2 MnIn and NiMn structural units in the temper annealed as well as the rapidly quenched off stoichiometric Ni 2 Mn 2−y In y alloys irrespective of their crystal structure.This random packing of the L2 1 and L1 0 structural units seems to be responsible for invariance of martensitic transition temperature in the temper annealed alloys as well as the absence of strain glass transition in rapidly quenched alloys.

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Strain glass versus antisite disorder induced ferromagnetic state in Fe doped Ni–Mn–In Heusler martensites

Cited by 6 publications

References 27 publications

Randomly packed Ni2MnIn and NiMn structural units in off-stoichiometric Ni2Mn2−y

Randomly packed Ni2MnIn and NiMn structural units in off-stoichiometric Ni2Mn2−y

Strain Glass State, Strain Glass Transition, and Controlled Strain Release

Randomly packed Ni$_2$MnIn and NiMn structural units in off stoichiometric Ni$_2$Mn$_{2-y}$In$_y$ alloys

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