The Ductility and Shape-Memory Properties of Ni–Mn–Ga–Cu Heusler Alloys
Agnieszka Brzoza-Kos, E. Cesari, M.J. Szczerba
Abstract
Abstract The effect of Cu addition on crystal structure, compressive properties and shape-memory effect of Ni 50 Mn 25 Ga 25− x Cu x alloys was studied. With increasing Cu content, the type of crystal structure evolves following a sequence: L2 1 → 10M → 2M → 2M+ γ . Addition of Cu significantly improves room temperature ductility. In polycrystalline Ni 50 Mn 25 Ga 17 Cu 8 alloy, a full recoverable strain equal to 7 pct was achieved. High martensitic transformation temperature and large shape-memory effect makes this material potential candidate in high-temperature shape-memory applications.
Topics & Concepts
Shape-memory alloyMaterials scienceDuctility (Earth science)Diffusionless transformationCrystalliteAlloyMetallurgyStrain (injury)MartensiteCrystal structureCrystallographyMicrostructureCreepChemistryInternal medicineMedicineShape Memory Alloy TransformationsCreativity in Education and Neuroscience