| 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 Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| Volume | 787 |
| Abstract | The 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. |
| DOI | 10.1016/j.msea.2020.139455 |
| WOS ID | WOS:000541741800006 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://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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