Crystallization of the amorphous phase and martensitic transformations in multicomponent (Ti,Hf,Zr)(Ni,Cu)-based alloys

• Published in: Journal of non-crystalline solids Vol. 353; no. 32-40; pp. 3062 - 3068
• Main Authors: Pasko, A., Kolomytsev, V., Vermaut, P., Prima, F., Portier, R., Ochin, P., Sezonenko, A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.10.2007; Elsevier
• Subjects: Amorphous metals; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Crystalline state (including molecular motions in solids); Crystallization; Crystallographic aspects of phase transformations; pressure effects; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass formation; Glass transitions; Martensitic transformations; Materials science; metallic glasses; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phases and equilibria; Physics; Specific phase transitions; Structure of solids and liquids; crystallography; Thermal properties; X-rays; 81.05.Kf; 81.30.Kf; Thermal properties; Phases and equilibria; Crystallization; X-rays; Amorphous metals; 61.43.Dq; Glass formation; Differential scanning calorimetry; Nickel alloys; Phase transformations; Martensitic transformations; metallic glasses; Crystallization; Glass formation; Phases and equilibria; Thermal properties; X-rays; XRD; Shape memory effects; Glass transition; Alloying elements; Titanium alloys; Metallic glasses; 61.43.Dq; 81.05.Kf; 81.30.Kf; Rapid solidification; Microstructure; Crystal structure
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2007.06.020

Shape memory materials with specific microstructure can be obtained from amorphous precursors. Rapidly solidified amorphous and crystalline–amorphous ribbons have been produced by planar flow casting for a number of multicomponent TiNi-based alloys of pseudobinary 50:50 and 55:45 compositions with substitutions of Zr, Hf, Nb for Ti and Cu, Co, Pd, Ag, Al for Ni. The glass transition and crystallization behavior of the amorphous phase as well as the martensitic transformations in the crystallized materials have been studied by differential scanning calorimetry. To control the crystal structure at different stages of crystallization, X-ray diffractometry and transmission electron microscopy were used. The effects of crystallization conditions and the resulting microstructural state on the martensitic transformation characteristics have been investigated. The transformation temperature intervals are shown to depend on the mean size of the parent phase crystals.