Study on Microstructure and Phase Composition of Co-8.8Al-9.8W Superalloy with Alloying Element Tantalum

Yang Tao Xu; Qi Zhen Sha; Wan Li Zhao

doi:10.4028/www.scientific.net/AMR.1083.37

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1083Study on Microstructure and Phase Composition of...

Study on Microstructure and Phase Composition of Co-8.8Al-9.8W Superalloy with Alloying Element Tantalum

Abstract:

In order to study the effect of tantalum to the microstructure and phase composition of Co-8.8Al-9.8W-XTa (X=0,2,at%) superalloy. The Co-8.8Al-9.8W-XTa (X=0,2) supperalloy used pure element powder, according to the ratio of different atomic percentage composition to make ingredients. It is mixed by planetary ball mill, pressed into blocks after the melting shape. Vacuum induction melting process was prepared by melting, after grinding, polishing, and after a volume of 5% perchloric acid and 95% of the electrolytic etching solution prepared in ethanol corrosion observed after analysis of the microstructure and phase composition by OM and XRD analysis. It can be found that the 9.8W and 2Ta alloy were mainly composed of rich γ-Co matrix of austenite precipitation of γ phase and coherent with matrix of the L1₂ structure of γ′-Co₃(Al,W) phase. In addition, Ta element has effect on grain refinement and the number of γ′-Co₃(Al,W) phase refines grain.

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Periodical:

Advanced Materials Research (Volume 1083)

Pages:

37-39

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1083.37

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Online since:

January 2015

Authors:

Yang Tao Xu*, Qi Zhen Sha, Wan Li Zhao

Keywords:

Alloying Element, Co-Al-W Superalloy, Vacuum Melting, γ′ Phase

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