High temperature, low neutron cross-section high-entropy alloys in the Nb-Ti-V-Zr system

被引：81

作者：

King, D. J. M. ^{[1
,2
]}

Cheung, S. T. Y. ^{[1
]}

Humphry-Baker, S. A. ^{[1
]}

Parkin, C. ^{[3
]}

Couet, A. ^{[3
]}

Cortie, M. B. ^{[4
]}

Lumpkin, G. R. ^{[5
]}

Middleburgh, S. C. ^{[6
]}

Knowles, A. J. ^{[1
,7
]}

机构：

[1] Imperial Coll London, Ctr Nucl Engn, London SW7 2AZ, England

[2] Univ New South Wales, Dept Mech Engn, Sydney, NSW 2052, Australia

[3] Univ Wisconsin, Dept Engn Phys, Madison, WI 53715 USA

[4] Univ Technol, Sch Math & Phys Sci, Sydney, NSW 2007, Australia

[5] Australian Nucl Sci & Technol Org, Lucas Heights, NSW, Australia

[6] Bangor Univ, Nucl Futures Inst, Dean St, Bangor LL57 1UT, Gwynedd, Wales

[7] Univ Birmingham, Sch Met & Mat, Birmingham B15 2SE, W Midlands, England

来源：

ACTA MATERIALIA | 2019年 / 166卷

关键词：

High-entropy alloys; Zirconium alloys; Modeling; Microstructure; Electron microscopy; INITIO MOLECULAR-DYNAMICS; PRINCIPAL ELEMENT ALLOYS; MATERIALS CHALLENGES; ELASTIC PROPERTIES; THERMAL-EXPANSION; PHASE-STABILITY; SOLID-SOLUTION; LOW-DENSITY; MICROSTRUCTURE; SEGREGATION;

D O I：

10.1016/j.actamat.2019.01.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-entropy alloys (HEAs) with high melting points and low thermal neutron cross-section are promising new cladding materials for generation III+ and IV power reactors. In this study a recently developed high throughput computational screening tool Alloy Search and Predict (ASAP) has been used to identify the most likely candidate single-phase HEM with low thermal neutron cross-section, from over a million four-element equimolar combinations. The selected NbTiVZr HEA was further studied by density functional theory (DFT) for moduli and lattice parameter, and by CALPHAD to predict phase formation with temperature. HEM of NbTiVZrx (x = 0.5, 1, 2) were produced experimentally, with Zr varied as the dominant cross-section modifier. Contrary to previous experimental work, these HEAs were demonstrated to constitute a single-phase HEA system; a result obtained using a faster cooling rate following annealing at 1200 degrees C. However, the beta (BCC) matrix decomposed following aging at 700 degrees C, into a combination of nano-scale beta, alpha (HCP) and C15 Laves phases. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：435 / 446

页数：12

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