Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 307, Issue 1-2, Pages 188-189Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(00)01957-2
Keywords
TiNi-based; shape memory alloys; melt-spinning; transformation behavior
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The observation of two successive stages in the martensitic transformation of Ti50Ni25Cu25 shape memory melt-spun ribbons after long-term annealing was formerly reported (H. Rosner, A.V. Shelyakov, A.M. Glezer, It. Felt, P. Schlossmacher, Mater. Sci. Eng. A273-275 (1999) 733). Microstructural investigations revealed the formation of thin plate-like precipitates. It was concluded that the two-stage transformation behavior is governed by the precipitation of these thin plates. Recent experiments are presented which now show that a change of transformation behavior call occur in the course of isothermal heat treatments owing to a crystalline surface layer in the as-spun state of melt-spun ribbons. The previous interpretation of the two-stage transformation behavior considering the influence of plate-like precipitates is corrected in this communication. (C) 2001 Elsevier Science B.V. All rights reserved.
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