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Journal of Materials Engineering and Performance

Erschienen in:

22.03.2019

Microstructure and Mechanical Properties of As-Cast γ-TiAl Alloys with Different Cooling Rates

verfasst von: K. Yang, Z. J. Yang, P. Deng, Z. Y. Chen, Z. W. Huang, H. L. Sun

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 4/2019

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Abstract

γ-TiAl alloys composed of Ti-45Al-5Nb-1W-1B (at.%) solidified at three different cooling rates by vacuum electromagnetic induction melting under a controlled degree of vacuum of under 2 Pa. The influence of the cooling rate on the microstructure and mechanical properties of the γ-TiAl alloy samples was investigated. A relatively large temperature gradient at the beginning of solidification led to a thin fine-grained layer around the graphite mold, and undercooling had two main effects: (a) promoting nucleation in the grain-refining surface layer and (b) promoting the growth of columnar crystals beneath the surface. Moreover, all prepared ingots of this alloy could be clearly divided into Regions S, M and C from the surface to the core. The colony size of Region M was larger than those of the other two regions due to composition segregation and the growth of columnar grains. The existence of tungsten led to micro-inhomogeneity, and the mechanical properties of the alloy changed according to concentration fluctuations. The degrees of homogeneity were expressed as H_0.1 and H_0.2. The alloy with the highest values, which possesses the best mechanical properties, solidified at a relatively low cooling rate. The deformation mechanism is also discussed.

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Titel: Microstructure and Mechanical Properties of As-Cast γ-TiAl Alloys with Different Cooling Rates
verfasst von: K. Yang
Z. J. Yang
P. Deng
Z. Y. Chen
Z. W. Huang
H. L. Sun
Publikationsdatum: 22.03.2019
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 4/2019
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-019-03970-y

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