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Coarsening behavior of gamma ' precipitates and compression deformation mechanism of a novel Co-V-Ta-Ti superalloy
Qu, Shasha; Li, Yingju; Wang, Cuiping; Liu, Xingjun; Qian, Kun; Ruan, Jingjing; Chen, Yuechao; Yang, Yuansheng
2020-06-10
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume787
AbstractThe coarsening behavior of gamma' precipitates at different temperatures and the compression deformation mechanism of a novel Co-V-Ta-Ti superalloy are investigated. It is found that the coarsening behavior of the gamma' precipitates follows the classical Lifshitz-Slyozov-Wagner (LSW) model based on measured results of the temporal evolution of the mean radius, volume fraction, and number density of the gamma' precipitates. The coarsening rate constant, K, of the gamma' precipitates is strongly dependent on the aging temperature, and it increases nearly ten times with the aging temperature rising from 800 to 900 degrees C. Within this temperature range, the activation energy for coarsening of the gamma' precipitates is determined to be 230 kJ/mol. This value is close to the activation energy for the diffusion of V in Co, suggesting that the coarsening rate of gamma' precipitates is limited by the diffusion of V element. A lot of slip bands are observed in the alloy after compression deformation, which shows the crystal slip is the primary deformation mechanism for the Co-V-Ta-Ti alloy. It is found that the dislocations bypass the gamma' precipitates below 700 degrees C in the alloy, and pairs of dislocations shear the gamma precipitates with a high density of stacking faults (SFs) above the peak temperature of 700 degrees C.
DOI10.1016/j.msea.2020.139455
WOS IDWOS:000541741800006
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/155696
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Qu, Shasha,Li, Yingju,Wang, Cuiping,et al. Coarsening behavior of gamma ' precipitates and compression deformation mechanism of a novel Co-V-Ta-Ti superalloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,787.
APA Qu, Shasha.,Li, Yingju.,Wang, Cuiping.,Liu, Xingjun.,Qian, Kun.,...&Yang, Yuansheng.(2020).Coarsening behavior of gamma ' precipitates and compression deformation mechanism of a novel Co-V-Ta-Ti superalloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,787.
MLA Qu, Shasha,et al."Coarsening behavior of gamma ' precipitates and compression deformation mechanism of a novel Co-V-Ta-Ti superalloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 787(2020).
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