Gamma-gamma prime-gamma double prime dual-superlattice superalloys

SCRIPTA MATERIALIA

卷:136

Article

Mignanelli, P. M.¹  Jones, N. G.¹  Pickering, E. J.^1,2  Messe, O. M. D. M.¹  Rae, C. M. F.¹  Hardy, M. C.³  Stone, H. J.¹ 

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England

[2] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs, England

[3] Rolls Royce Plc, POB 31, Derby DE24 8BJ, England

关键词: Nickel alloys;    Superalloy;    Transmission electron microscopy;   

DOI  :  10.1016/j.scriptamat.2017.04.029

来源: Elsevier

【 摘 要 】

Improving the efficiency of gas turbine engines requires the development of new materials capable of operating at higher temperatures and stresses. Here, we report on a new polycrystalline nickel-base superalloy that has exceptional strength and thermal stability. These properties have been achieved through a four-element composition that can form both gamma prime and gamma double prime precipitates in comparable volume fractions, creating an unusual dual-superlattice microstructure. Alloying studies have shown that further property improvements can be achieved, and that with development such alloys may be suitable for future engine applications. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

Free