TEM Characterization of Twinning in Co39Ni33Al28 Alloy

H. Y. Wang; K. Wang; Z. H. Liu; Y. G. Wang; G. H. Wu; X. F. Duan

doi:10.2320/matertrans.MRA2007602

TEM Characterization of Twinning in Co₃₉Ni₃₃Al₂₈ Alloy

H. Y. Wang, K. Wang, Z. H. Liu, Y. G. Wang, G. H. Wu, X. F. Duan

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Keywords: twinning, cobalt-nickel-aluminum alloy, transmission electron microscope (TEM), martensite transformation

JOURNAL FREE ACCESS

2007 Volume 48 Issue 8 Pages 2139-2142

DOI https://doi.org/10.2320/matertrans.MRA2007602

View "Advance Publication" version (July 19, 2007).

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Abstract

A body-centered tetragonal (bct) twin martensite has been found in Co₃₉Ni₃₃Al₂₈ ferromagnetic shape memory alloy by transmission electron microscope (TEM) observation. The twin lamellae have Σ=25 (01\\bar1) twin boundaries and slip system [011]||(01\\bar1). Periodic appearance of the twin lamellae resulted in a modulated structure with a repeat periodicity of 56d01\\bar1 perpendicular to the twin interface. The twinning mechanism during martensite transformation is discussed briefly.

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