Characterization of a rapidly annealed Ti50Ni25Cu25 melt-spun ribbon

• Published in: Journal of alloys and compounds Vol. 456; no. 1-2; pp. 170 - 177
• Main Authors: Tong, Yunxiang, Liu, Yong, Xie, Zeliang
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 29.05.2008
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; Martensitic transformations; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Grain size; Nickel alloys; Crystallization; Tensile tests; Martensitic transformations; Ternary alloys; Melt spinning; Amorphous state; Grain orientation; Stress-strain relations; Texture; Shape memory effects; Rapid thermal annealing; Titanium alloys; TiNiCu ribbon; Deformation behavior; Copper alloys; Martensitic transformation; Two-way memory effect; Thermal annealing; Transition element alloys; Recovery (properties)
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2007.02.075

In the present paper, crystallization behavior, martensitic transformation and deformation behavior of a Ti50Ni25Cu25 ribbon annealed at 400 deg C under rapid heating were studied. The initially amorphous ribbon was fully crystallized under rapid thermal annealing at 400 deg C for 30 s. However, under conventional thermal annealing, crystallization temperature was above 450 deg C. The crystallization at low temperature under rapid heating was attributed to the release of the extra energy due to the annihilation of free-volume in amorphous state. With increasing the annealing time, martensitic transformation temperatures increased. The ribbon annealed at 400 deg C for 300 s has developed good shape recovery properties. A 2.7% one-way memory strain was obtained the tensile strain of 5.5%. The deformation behavior showed non-flat stress-plateau and high spring-back, which is discussed in terms of grain size and orientation distribution of martensite variants.