The role of shear instability in amorphization of cold-rolled niti

Junichi Koike, D. M. Parkin, M. Nastasi

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Alloy sheets of Ni-49-2 at.% Ti were cold rolled at room temperature. The microstructure of a 60% reduced sample showed the formation of amorphous bands within the finely twinned crystalline matrix. Sample fracture was observed for reductions of more than 65%. The fracture surface extended straight and inclined 30° to 50° to the compression direction. Similarities in morphology to the shear bands observed in heavily cold-rolled metals suggest that an amorphous phase forms in the shear band, caused by the mechanical instability against shear stress.

Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalPhilosophical Magazine Letters
Issue number4
Publication statusPublished - 1990 Oct


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