New structure in refractory high-entropy alloys

被引：100

作者：

Lilensten, L. ^{[1
]}

Couzinie, J. P.

Perriere, L.

Bourgon, J.

Emery, N.

Guillot, I.

机构：

[1] CNRS, Inst Chim & Mat Paris Est, UMR 7182, F-94320 Thiais, France

来源：

MATERIALS LETTERS | 2014年 / 132卷

关键词：

High-entropy alloys; Refractory alloys; Orthorhombic; Hexagonal; TEM; XRD; SOLID-SOLUTION PHASE; MULTICOMPONENT; MICROSTRUCTURE;

D O I：

10.1016/j.matlet.2014.06.064

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of a new refractory high-entropy alloy of composition close to Ti35Zr27.5Hf27.5Nb5Ta5 prepared by arc melting and induction techniques was investigated using X-Ray diffraction (XRD) and transmission electron microscopy (TEM). This alloy presents optimal empirical parameters for the formation of a solid solution phase. The as-cast material displays a density of 8480 kg m(-3) and a Vickers microhardness close to 2400 MPa. While the Rietveld refinement of XRD data indicates an orthorhombic (martensite) alpha ''-type structure for the bulk alloy, TEM observations prove that the alloy exhibits a twinned hexagonal structure as thin foil. An orthorhombic-hexagonal transformation by stress relaxation during TEM sample preparation is discussed. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：123 / 125

页数：3

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