Coarsening behavior of gamma ' precipitates and compression deformation mechanism of a novel Co-V-Ta-Ti superalloy

doi:10.1016/j.msea.2020.139455

IMR OpenIR

	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
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷号	787
摘要	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记录号	WOS:000541741800006
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/155696
专题	中国科学院金属研究所
推荐引用方式 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).