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Tension/compression asymmetry in additive manufactured face centered cubic high entropy alloy

journal contribution
posted on 2017-03-01, 00:00 authored by Jithin JosephJithin Joseph, N Stanford, Peter HodgsonPeter Hodgson, Daniel FabijanicDaniel Fabijanic
The high entropy alloy, Al 0.3 CoCrFeNi, has been fabricated by direct laser fabrication and its deformation behaviour studied. This alloy exhibited significant tension/compression asymmetry in its work hardening rate and ductility. The exceptionally high work hardening in compression has been attributed to profuse mechanical twinning which has been exacerbated by a strong texture in the as-cast material. The tensile deformed material did not exhibit any mechanical twinning, deformed exclusively by slip, and therefore showed minimal work hardening and poor ductility. The critical resolved shear stress for twinning of the alloy was found to be approximately 240 MPa.

History

Journal

Scripta materialia

Volume

129

Pagination

30 - 34

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

1359-6462

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2016, Acta Materiala