Crystal-To-Amorphous Transformation of NiTi Induced by Cold Rolling

J. Koike, D. M. Parkin, M. Nastasi

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159 Citations (Scopus)


A NiTi intermetallic compound was cold rolled at room temperature by 30% and 60% thickness reductions, and microstructures were studied by means of transmission electron microscopy (TEM). In the cold-rolled samples we observed both a phase of nanometer-sized crystals and an amorphous phase. A substantially high dislocation density, 1013 to 1014/cm2, was evident in the transition region between crystalline and amorphous phases. A simple estimate of the elastic energy arising from this dislocation density is of the same order as the crystallization energy, suggesting that dislocation accumulation is a major driving force for amorphization in cold-rolled NiTi.

Original languageEnglish
Pages (from-to)1414-1418
Number of pages5
JournalJournal of Materials Research
Issue number7
Publication statusPublished - 1990 Jul


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