High-entropy alloy strengthened by in situ formation of entropy-stabilized nano-dispersoids

A significant increase in compressive yield strength of the Al(0.3)CoCrFeMnNi high-entropy alloy (HEA) from 979 MPa to 1759 MPa was observed upon the introduction of 3 vol.% Y(2)O(3). The HEAs were processed using spark plasma sintering of mechanically alloyed powders. Transmission electron microsco...

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Detalles Bibliográficos
Autores principales: Gwalani, Bharat, Pohan, Rizaldy M., Lee, Junho, Lee, Bin, Banerjee, Rajarshi, Ryu, Ho Jin, Hong, Soon Hyung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6148222/
https://www.ncbi.nlm.nih.gov/pubmed/30237517
http://dx.doi.org/10.1038/s41598-018-32552-6
Descripción
Sumario:A significant increase in compressive yield strength of the Al(0.3)CoCrFeMnNi high-entropy alloy (HEA) from 979 MPa to 1759 MPa was observed upon the introduction of 3 vol.% Y(2)O(3). The HEAs were processed using spark plasma sintering of mechanically alloyed powders. Transmission electron microscopy and atom probe tomography confirmed the presence of compositionally complex nano-dispersoids in the Y(2)O(3)-added HEA. The significant increase in strength can be attributed to the nano-dispersoid strengthening coupled with grain refinement. Therefore, the in-situ formation of the compositionally complex nanoscale dispersoids during the alloy processing could be a novel approach to create entropy-stabilized oxide particles in strengthening of HEAs.

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