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Effects of Mo on the evolution of microstructures and mechanical properties in Co-Al-W base superalloys
Liu, J.; Yu, J. J.; Yang, Y. H.; Zhou, Y. Z.; Sun, X. F.
2019-02-04
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume745Pages:404-410
AbstractThe solidification paths, microstructures and mechanical properties of two Co-Al-W base superalloys with different additions of tungsten and molybdenum were investigated. Mo addition does not influence the volume fraction of the gamma' phase; however, the morphology of the gamma' phase changes from cuboidal to near cuboidal. The mu phase and beta phase were identified in both alloy systems. Although the melting point of the mu phase is decreased by Mo addition, the solidification paths remain the same: L -> L-1 + gamma -> L-2 + gamma + mu -> gamma + mu + beta -> gamma + mu + beta + gamma' . The precipitation of a gamma' phase envelop around the interdendritic regions in Co-Al-W alloy systems has never been reported. The formation of a surrounding gamma' phase was caused by the diffusion of elements between secondary phases and the substrate during the heat treatments. The microhardness of the mu phase, which can be easily influenced by Mo addition, is the highest in both alloys, followed by the microhardnesses of the beta phase and the substrate. In the fracturing process, microcracks were generated in the mu phase, the number of which increased with Mo addition.
KeywordCo-base superalloys Molybdenum Microstructures Tensile behavior Solidification path
Indexed BySCI
Language英语
WOS IDWOS:000457819400043
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81384
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Liu, J.,Yu, J. J.,Yang, Y. H.,et al. Effects of Mo on the evolution of microstructures and mechanical properties in Co-Al-W base superalloys[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,745:404-410.
APA Liu, J.,Yu, J. J.,Yang, Y. H.,Zhou, Y. Z.,&Sun, X. F..(2019).Effects of Mo on the evolution of microstructures and mechanical properties in Co-Al-W base superalloys.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,745,404-410.
MLA Liu, J.,et al."Effects of Mo on the evolution of microstructures and mechanical properties in Co-Al-W base superalloys".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 745(2019):404-410.
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