Yttrium induced formation of new pores in an as-cast nickel-based single crystal superalloy

doi:10.1016/j.matchar.2024.114192

IMR OpenIR

	Yttrium induced formation of new pores in an as-cast nickel-based single crystal superalloy
	Wang, N.1,2; Liu, J. D.1; Xu, W.2; Li, J. G.1
通讯作者	Liu, J. D.(jdliu@imr.ac.cn) ; Li, J. G.(jgli@imr.ac.cn)
	2024-09-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	215 页码:11
摘要	Pores are the most fatal defects in single crystal superalloys, which severely deteriorates the mechanical properties. Yttrium (Y) has been applied in commercial superalloys, but its effect on the morphology change of casting pores is not clear. This work focuses on the effect of Y on the evolution of pores formed after directional solidification in a second-generation superalloy. SEM, TEM and XRT were used to characterize the pores, and Thermo-Calc was used to calculate the surface tension change during the solidification process. Results show that, besides the formation of two types of conventional shrinkage pores during solidification, new types of pores, i.e., Type III and Type IV, due to the addition of Y element to 0.5 wt% in superalloy, were also observed. The formation of Type III pore could be ascribed to the surface tension drop in the liquid phase, which enhances the wettability at the solid/liquid interface, and promotes the mobility of liquid phase, due to the incorporation of Y element. The formation of Type IV pore is due to the simultaneous formation and growth of M23C6 and Ni3Al in the Ni5Y phase, triggering the formation of closed zone with a small but irregular shape at the multi-phase interface.
关键词	Micro-pores Shrinkage pores Single crystal superalloy Yttrium element Surface tension
资助者	National Science and Technology Major Project ; National Key R & D Program of China
DOI	10.1016/j.matchar.2024.114192
收录类别	SCI
语种	英语
资助项目	National Science and Technology Major Project[J2019-VI-0023-0139] ; National Science and Technology Major Project[J2019-VII-0004-0144] ; National Key R & D Program of China[2020YFA0714904]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001285079200001
出版者	ELSEVIER SCIENCE INC
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/188931
专题	中国科学院金属研究所
通讯作者	Liu, J. D.; Li, J. G.
作者单位	1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 2.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Wang, N.,Liu, J. D.,Xu, W.,et al. Yttrium induced formation of new pores in an as-cast nickel-based single crystal superalloy[J]. MATERIALS CHARACTERIZATION,2024,215:11.
APA	Wang, N.,Liu, J. D.,Xu, W.,&Li, J. G..(2024).Yttrium induced formation of new pores in an as-cast nickel-based single crystal superalloy.MATERIALS CHARACTERIZATION,215,11.
MLA	Wang, N.,et al."Yttrium induced formation of new pores in an as-cast nickel-based single crystal superalloy".MATERIALS CHARACTERIZATION 215(2024):11.