The effects of grain boundary structure and bulk Cr content on grain boundary degradation behavior of Ni-Cr binary alloys in high temperature CO<sub>2</sub>

doi:10.1016/j.actamat.2023.119496

IMR OpenIR

	The effects of grain boundary structure and bulk Cr content on grain boundary degradation behavior of Ni-Cr binary alloys in high temperature CO₂
	Yang, Liujie 1; Qian, Hongchen 1; Hao, Xianchao 2,3; Kuang, Wenjun 1
通讯作者	Kuang, Wenjun(wjkuang66@gmail.com)
	2024-01-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	263 页码:15
摘要	The effects of grain boundary (GB) structure and bulk Cr content (from 15 wt.% to 30 wt.%) on GB oxidation behavior of Ni-Cr binary alloys were investigated in 650 degrees C/1atm CO2 gas. The degradation behaviors of GBs, which varies greatly (including preferential intergranular oxidation, general intergranular oxidation and GB passivation), is dictated by the available Cr source which depends on the bulk Cr content and the Cr diffusion flux to the reaction front. The Cr diffusivity along GB is dependent on GB structure and decreases in the order of random high angle GB (RHAB), low angle GB (LAGB), incoherent twin boundary (ITB) and coherent twin boundary (CTB). Interestingly, other coincident site lattice boundary (CSLB (Sigma>3)) shows a Cr diffusivity between ITB and CTB. More importantly, the threshold bulk Cr content for achieving GB passivation is also closely related to GB structure. To be specific, LAGB completely passivates when the bulk Cr content is between 20 wt.% and 25 wt.%, while ITB completely passivates at a bulk Cr content of 25 wt.% and CSLB (Sigma>3) completely passivates when the bulk Cr content is between 25 wt.% and 30 wt.%. In contrast, CTB is subject to general intergranular oxidation while RHAB shows passivation regardless of the bulk Cr content.
关键词	Nickel alloy SEM Grain boundary diffusion Preferential oxidation Grain boundary migration
资助者	National Natural Science Foundation ; Development Program of the Ministry of Science and Technology of China ; Young Talent Support Plan of Xi'an Jiaotong University
DOI	10.1016/j.actamat.2023.119496
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation[52271068] ; Development Program of the Ministry of Science and Technology of China[2019YFA0209900] ; Young Talent Support Plan of Xi'an Jiaotong University
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001116650300001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
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/321006/177136
专题	中国科学院金属研究所
通讯作者	Kuang, Wenjun
作者单位	1.Xi An Jiao Tong Univ, Ctr Adv Mat Performance Nanoscale CAMP Nano, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China 2.Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Yang, Liujie,Qian, Hongchen,Hao, Xianchao,et al. The effects of grain boundary structure and bulk Cr content on grain boundary degradation behavior of Ni-Cr binary alloys in high temperature CO₂[J]. ACTA MATERIALIA,2024,263:15.
APA	Yang, Liujie,Qian, Hongchen,Hao, Xianchao,&Kuang, Wenjun.(2024).The effects of grain boundary structure and bulk Cr content on grain boundary degradation behavior of Ni-Cr binary alloys in high temperature CO₂.ACTA MATERIALIA,263,15.
MLA	Yang, Liujie,et al."The effects of grain boundary structure and bulk Cr content on grain boundary degradation behavior of Ni-Cr binary alloys in high temperature CO₂".ACTA MATERIALIA 263(2024):15.