On the bcc/B2 interface structure in a refractory high entropy alloy

被引：26

作者：

Kloenne, Zachary T. ^{[1
]}

Couzinie, Jean-Philippe ^{[1
,2
]}

Heczko, Milan ^{[1
]}

Groger, Roman ^{[1
,3
]}

Viswanathan, Gopal B. ^{[1
]}

Clark, William A. T. ^{[1
]}

Fraser, Hamish L. ^{[1
]}

机构：

[1] Ohio State Univ, Ctr Accelerated Maturat Mat, Dept Mat Sci & Engn, 1305 Kinnear Rd, Columbus, OH 43212 USA

[2] Univ Paris Est Creteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, F-94320 Thiais, France

[3] Czech Acad Sci, Inst Phys Mat & CEITEC IPM, Zizkova 22, Brno 61600, Czech Republic

来源：

SCRIPTA MATERIALIA | 2023年 / 223卷

关键词：

Refractory high-entropy alloy; Interface structure; Misfit dislocation; Nye tensor; Phase transformation; SINGLE-CRYSTAL; SUPERALLOY; MICROSTRUCTURE; CREEP;

D O I：

10.1016/j.scriptamat.2022.115071

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A refined microstructure consisting of bcc precipitates embedded in an ordered B2 matrix has been observed in the refractory high entropy alloy (RHEA) AlMo0.5NbTa0.5TiZr, resembling an "inverted superalloy-like" micro-structure. A planar {100} bcc/B2 interface exists in this state. Coarsening of the microstructure occurs after aging at 1000 degrees C for 6 h, resulting in a faceted interface. In this case, the primary plane of the interface is parallel to a {100} plane, while the step associated with the facet is parallel to a {110} plane. Misfit dislocations at the interface were observed on the {110} interface plane, with Burgers vector of a/2 111bcc, which extend into the bcc phase, and have an average spacing of 13.7 +/- 0.6 nm. No lattice invariant deformation (LID) normal to the primary {110} planes was observed, such that the transformation between the B2 and bcc phases constitutes a pure expansion.

引用

页数：4

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