Persistent slip observed in TiZrNbHfTa: A body-centered high-entropy cubic alloy

SCRIPTA MATERIALIA

卷:200

Article

Tanaka, Masaki^1,2  Okajo, Shinji³  Yamasaki, Shigeto¹  Morikawa, Tatsuya¹ 

[1] Kyushu Univ, Dept Mat, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[2] Kyoto Univ, Ctr Elements Strategy Initiat Struct Mat, Sakyo Ku, Kyoto 6068501, Japan

[3] Kyushu Univ, Grad Sch Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

关键词: HEA;    Cross-slip;    Refectory alloy;    Deformation;    Critical resolved shear stress;   

DOI  :  10.1016/j.scriptamat.2021.113895

来源: Elsevier

【 摘 要 】

Slip properties of TiZrNbHfTa were evaluated to obtain ??? relationships, where ? is defined as the angle between the maximum shear stress plane and ( 1? 01 ) . ? is defined as the angle between the apparent slip plane and ( 1? 01 ) . Bending tests were conducted with micrometer-sized cantilevers fabricated from a single grain with a focused ion beam. Slip bands appear to be straight on a micrometer lengthscale, as for Fe?Si alloys, which suggests a persistent slip. However, the ??? relationship indicated that ? is nearly the same as ?, suggesting that there is no persistent slip. Detailed observations with an atomic force microscope confirm that cross-slipping is so frequent at a sub-micrometer length-scale that the slip bands appear to be straight and the maximum shear stress plane is observed on a micrometer length-scale. Here, TiZrNbHfTa shows abnormally frequent cross-slipping, which is a novel characteristic of high-entropy body-centered cubic alloys. ? 2021 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

【 授权许可】

Free