文章基本信息

标题：High-entropy alloy strengthened by in situ formation of entropy-stabilized nano-dispersoids
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作者：Bharat Gwalani ; Rizaldy M. Pohan ; Junho Lee 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2018
卷号：8
期号：1
页码：14085
DOI：10.1038/s41598-018-32552-6
语种：English
出版社：Springer Nature
摘要：A significant increase in compressive yield strength of the Al_0.3CoCrFeMnNi high-entropy alloy (HEA) from 979 MPa to 1759 MPa was observed upon the introduction of 3 vol.% Y₂O₃. 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 Y₂O₃-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.