Fine-Grained Structures Associated with Deformation Twin and Its Influence on Tensile Behaviours in a Cold-Rolled Fe-Ni Alloy

Tatsuya Morikawa; Taku Moronaga; Kenji Higashida

doi:10.4028/www.scientific.net/MSF.503-504.895

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HomeMaterials Science ForumMaterials Science Forum Vols. 503-504Fine-Grained Structures Associated with...

Fine-Grained Structures Associated with Deformation Twin and Its Influence on Tensile Behaviours in a Cold-Rolled Fe-Ni Alloy

Abstract:

Fine-grained structures in Fe-36mass%Ni Invar alloy have been investigated by using transmission electron microscopy (TEM). Particular attention has been paid on the role of deformation twinning in the formation of fine-grained structures and its influence on tensile stressstrain behaviours of rolled specimens. In Fe-Ni Invar alloy with a moderate stacking fault energy, deformation twin did not appear in usual cold-rolling at room temperature (RT), where a kind of cell walls was formed and the Cu-type texture was observed. On the other hand, twinning was occurred by rolling when specimens were cooled to liquid nitrogen temperature (LNT) immediately before the rolling. In such case, a fine lamellar structure was developed and the brass-type texture appeared. However, the lamella boundaries did not coincide with any crystallographic planes, and they were intersected with the bands of deformation twin. Specimens rolled by 90% in thickness reduction exhibited tensile stressstrain behaviours similar to those observed in specimens with SPD structures. In particular, specimens rolled at LNT showed high yield strengths and non-uniform deformation.

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Periodical:

Materials Science Forum (Volumes 503-504)

Pages:

895-900

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.503-504.895

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Online since:

January 2006

Authors:

Tatsuya Morikawa, Taku Moronaga, Kenji Higashida

Keywords:

Rolling , Twinning, Deformation Microstructure, TEM

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