Tungsten-based bcc-superalloys

被引：30

作者：

Knowles, Alexander J. ^{[1
,2
,4
]}

Dye, David ^{[1
]}

Dodds, Russel J. ^{[1
]}

Watson, Andy ^{[3
]}

Hardie, Christopher D. ^{[4
]}

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

机构：

[1] Imperial Coll, Dept Mat, London SW7 2AZ, England

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

[3] Hampton Thermodynam Ltd, Hampton TW12 1NL, England

[4] Culham Ctr Fus Energy, Abingdon OX14 3DB, Oxon, England

来源：

APPLIED MATERIALS TODAY | 2021年 / 23卷

关键词：

High temperature materials; Tungsten; Phase equilibria; Intermetallics; Precipitation; MECHANICAL-PROPERTIES; HEAVY ALLOYS; OXIDATION; FRACTURE;

D O I：

10.1016/j.apmt.2021.101014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Applications from nuclear energy to rockets and jet engines are underpinned by advanced high temperature materials. Whilst state of the art, the performance of current nickel-based superalloys is fundamentally limited to Ni's melting point, T-m = 1455 degrees C. Here, we develop an analogous superalloy concept but with superior high temperature capability by transitioning to a bcc tungsten base, T-m = 3422 degrees C. This strategy involves reinforcing bcc beta-W by beta' TiFe intermetallic compound, which results in impressive high temperature compressive strengths of 500 MPa at 1000 degrees C. This bcc-superalloy design approach has wider applicability to other bcc alloy bases, including Mo, Ta, and Nb, as well as to refractory-metal high entropy alloys (RHEAs). By investigation of the underlying phase equilibria, thermodynamic modelling, characterisation and mechanical properties, we demonstrate the capability of ternary W-Ti-Fe tungsten-based bcc-superalloys as a new class of high temperature materials. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：6

共 38 条

[1] Microstructures and mechanical properties of a directionally solidified NiAl-Mo eutectic alloy [J].