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

被引：27
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.
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页数：4
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