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

Junichi Koike; D. M. Parkin; M. Nastasi

doi:10.1080/09500839008215132

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

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

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	257-264
Number of pages	8
Journal	Philosophical Magazine Letters
Volume	62
Issue number	4
DOIs	https://doi.org/10.1080/09500839008215132
Publication status	Published - 1990 Oct

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AB - 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.

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

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