On the design and feasibility of tantalum-base superalloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:804

Article

Pickering, E. J.¹  Christofidou, K. A.²  Stone, H. J.²  Jones, N. G.² 

[1] Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, Lancs, England

[2] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England

关键词: Superalloys;    Refractory alloys;    Tantalum alloys;    Alloy design;    High temperature alloys;    Phase identification;   

DOI  :  10.1016/j.jallcom.2019.07.003

来源: Elsevier

【 摘 要 】

In order to reduce the environmental impact of air travel, it is desirable that the efficiencies of gas turbine engines are increased. One way to achieve this goal is to increase the operating temperatures of the engine cores. Unfortunately for aero-engine manufacturers, the temperature capability limits of the Ni-base superalloys used currently have been reached. Hence, new alloys need to be developed that are capable of operating at significantly higher temperatures. In this article, the potential of tantalum-base superalloys is discussed and explored. A suite of alloys based on the Ta-Al-Co system was investigated. It was found that an array of fine carbide precipitates was formed in the Ta-rich matrix in a subset of the alloys, which is promising in terms of developing a strong and damage-tolerant microstructure, but that the elemental partitioning of Al out of the matrix accompanying precipitation is likely to degrade environmental resistance. Nevertheless, it is believed that the design principles described have the potential to facilitate the development of the next generation of high-temperature alloys based on systems of this type. (C) 2019 The Authors. Published by Elsevier B.V.

【 授权许可】

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