Effect of Annealing Conditions on the Structure of Ni50Mn29Ga21 Shape Memory Alloy

Rafał Wróblewski; Marcin Leonowicz

doi:10.4028/www.scientific.net/SSP.154.151

Paper Titles

Tensile Stress-Strain Relationships of Magnetorheological Fluids under Various Factors
p.127

Texture Analysis of Hot Rolled Ni-Mn-Ga Alloys
p.133

Monte Carlo Study of Magnetostructural Phase Transitions in Ni₅₀Mn_25+xSb_25-x Heusler Alloys
p.139

Microstructure and Magnetic Properties of Two Phase β+γ Ferromagnetic Co-Ni-Al Alloys
p.145

Effect of Annealing Conditions on the Structure of Ni₅₀Mn₂₉Ga₂₁ Shape Memory Alloy
p.151

Sensor of Current or Magnetic Field Based on Magnetoresistance Effect in (La_0.7Ca_0.3)_0.8Mn_1.2O₃ Manganite Film
p.157

Field Dependence of the Refrigerant Capacity for La_0.6Ca_0.4MnO₃ Manganite
p.163

Magnetic Anisotropy of Nanocrystalline HITPERM-Type Alloys and its Correlation with Application
p.169

Magnetic Field Analysis for Magnetron Sputtering Apparatus for Accurate Composition Control
p.175

HomeSolid State PhenomenaSolid State Phenomena Vol. 154Effect of Annealing Conditions on the Structure of...

Effect of Annealing Conditions on the Structure of Ni₅₀Mn₂₉Ga₂₁ Shape Memory Alloy

Abstract:

Effect of annealing conditions on the structure and phase transition temperatures for polycrystalline Ni50Mn29Ga21 alloy was studied. The final structure strongly depends on the annealing temperature and cooling rate. Ordering of the austenitic phase, performed by annealing at elevated temperatures, plays an important role in formation of the proper martensitic structure. For the Ni50Mn29Ga21 alloy annealing below the ordering temperature (1033 K) forms 5M modulated martensitic structure, irrespective of the cooling rate. The 7M modulated martensitic structure can be produced after annealing above the ordering temperature, followed by slow cooling.