Fracture Toughness Evaluation of a Ni<sub>2</sub>MnGa Alloy Through Micro Indentation Under Magneto-Mechanical Loading

Goanță, Viorel; Ciocanel, Constantin

doi:10.1515/aucts-2017-0012

Cited by 3 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During cooling below M s , these alloys exhibit a sequence of first-order phase transitions from the parent cubic L 2 1 phase to long-period modulated intermediate martensite structures (denoted as 10 M and 14 M ), as well as to tetragonal 2 M martensite without lattice modulation [ 5 ]. A significant key limitation for wide practical application is the brittleness and poor machinability of ferromagnetic and other polycrystalline SM alloys, with the exception of titanium nickelide [ 1 , 2 , 3 , 4 , 16 , 18 , 20 ]. The high brittleness of Ni 2 MnGa-based alloys even in a single-crystalline state represents an obvious obstacle for realization of SM, GS, and other related effects.…”

Section: Introductionmentioning

confidence: 99%

New Metastable Baro- and Deformation-Induced Phases in Ferromagnetic Shape Memory Ni2MnGa-Based Alloys

et al. 2022

View full text Add to dashboard Cite

Structural and phase transformations in the microstructure and new metastable baro- and deformation-induced phases of the Ni50Mn28.5Ga21.5 alloy, typical of the unique class of ferromagnetic shape memory Heusler alloys, have been systematically studied for the first time. Phase X-ray diffraction analysis, transmission and scanning electron microscopy, and temperature measurements of electrical resistivity and magnetic characteristics in strong magnetic fields were used. It was found that in the course of increasing the pressure from 3 to 12 GPa, the metastable long-period structure of martensite modulated according to the 10M-type experienced transformation into a final non-modulated 2M structure. It is proved that severe shear deformation by high pressure torsion (HPT) entails grainsize refinement to a nanocrystalline and partially amorphized state in the polycrystalline structure of the martensitic alloy. In this case, an HPT shear of five revolutions under pressure of 3 GPa provided total atomic disordering and a stepwise structural-phase transformation (SPT) according to the scheme 10M → 2M → B2 + A2, whereas under pressure of 5 GPa the SPT took place according to the scheme 10M → 2M → B2 → A1. It is shown that low-temperature annealing at a temperature of 573 K caused the amorphous phase to undergo devitrification, and annealing at 623–773 K entailed recrystallization with the restoration of the L21 superstructure in the final ultrafine-grained state. The size effect of suppression of the martensitic transformation in an austenitic alloy with a critical grain size of less than 100 nm at cooling to 120 K was determined. It was established that after annealing at 773 K, a narrow-hysteresis thermoelastic martensitic transformation was restored in a plastic ultrafine-grained alloy with the formation of 10M and 14M martensite at temperatures close to those characteristic of the cast prototype of the alloy.

show abstract

Section: Introductionmentioning

confidence: 99%

New Metastable Baro- and Deformation-Induced Phases in Ferromagnetic Shape Memory Ni2MnGa-Based Alloys

et al. 2022

View full text Add to dashboard Cite

show abstract

Fracture toughness evaluation of Ni2MnGa magnetic shape memory alloys by Vickers micro indentation

D’Silva

Goanță

Ciocanel

2021

Engineering Fracture Mechanics

View full text Add to dashboard Cite

A Semi-Empirical Model for Fracture Energy Evaluation of a Ni2mnga Magnetic Shape Memory Alloy

D'Silva,

Ciocanel

2024

Preprint

View full text Add to dashboard Cite

Fracture Toughness Evaluation of a Ni₂MnGa Alloy Through Micro Indentation Under Magneto-Mechanical Loading

Cited by 3 publications

References 4 publications

New Metastable Baro- and Deformation-Induced Phases in Ferromagnetic Shape Memory Ni2MnGa-Based Alloys

New Metastable Baro- and Deformation-Induced Phases in Ferromagnetic Shape Memory Ni2MnGa-Based Alloys

Fracture toughness evaluation of Ni2MnGa magnetic shape memory alloys by Vickers micro indentation

A Semi-Empirical Model for Fracture Energy Evaluation of a Ni2mnga Magnetic Shape Memory Alloy

Contact Info

Product

Resources

About

Fracture Toughness Evaluation of a Ni2MnGa Alloy Through Micro Indentation Under Magneto-Mechanical Loading

Cited by 3 publications

References 4 publications

New Metastable Baro- and Deformation-Induced Phases in Ferromagnetic Shape Memory Ni2MnGa-Based Alloys

New Metastable Baro- and Deformation-Induced Phases in Ferromagnetic Shape Memory Ni2MnGa-Based Alloys

Fracture toughness evaluation of Ni2MnGa magnetic shape memory alloys by Vickers micro indentation

A Semi-Empirical Model for Fracture Energy Evaluation of a Ni2mnga Magnetic Shape Memory Alloy

Contact Info

Product

Resources

About

Fracture Toughness Evaluation of a Ni₂MnGa Alloy Through Micro Indentation Under Magneto-Mechanical Loading