Interfacial Reaction and Thermal Stability of the SiCf/TiAl Composites

doi:10.11900/0412.1961.2021.00076

IMR OpenIR

	Interfacial Reaction and Thermal Stability of the SiCf/TiAl Composites
	Shen Yingying 1,2; Zhang Guoxing 1; Jia Qing 1; Wang Yumin 1; Cui Yuyou 1; Yang Rui 1
通讯作者	Jia Qing(qjia@imr.ac.cn) ; Yang Rui(ryang@imr.ac.cn)
	2022-09-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	58 期号:9 页码:1150-1158
摘要	SiC-fiber-reinforced gamma-TiAI composite materials are promising for high-temperature structural applications owing to their excellent mechanical properties. However, the interfacial reaction of the composites during subsequent high-temperature processing and service is unstable as elements continue to diffuse around the interfacial reaction layer at high temperatures, and more interfacial reaction products are generated. When excessive brittle reaction products are generated, they have detrimental effects on the mechanical properties of the composites. Therefore, to better design and control the interfacial reaction, it is particularly important to study the formation and growth of the complex interfacial products of the composites. In this study, the formation mechanism of interfacial reaction products and thermal stability of SiCf/TiAl composites were investigated by thermal exposure for different time. First, the SiCf/TiAI composites were prepared by suction casting. Next, the specimens were examined by SEM and TEM to investigate the element diffusion and composition of the interfacial reaction products of the as-prepared composites. The interfacial reaction products in the as-prepared composites were mainly composed of a fine equiaxed TiC layer near a carbon layer and a coarse equiaxed TiC layer near a titanium alloy coating. Then, the thermal exposure was conducted at 800 degrees C to investigate the growth of the interfacial reaction products and thermal stability of the interfacial reaction layer. The results show that the thickness of the interfacial reaction layer increased with heat exposure time. Meanwhile, interfacial stratification was observed during the growth of the interface reaction layer. Further, the growth kinetics curve of the reaction layer was drew according to the thickness of the reaction layer with time, and the interfacial reaction growth rate was determined. According to the morphology and TEM analysis results, the interfacial reaction layer was divided into four layers after 200 h thermal exposure, unlike in the as-prepared state. From the fiber side to matrix side, fine-grained TiC, coarse-grained TiC, (Ti, Zr)(5)Si-4, and Ti3Sn + Ti(2)AIC layers, respectively, were observed. Finally, the formation mechanism of the interfacial reaction products and element diffusion of SiCf/TiAI composites under different conditions were studied, the interfacial stratification occurred during thermal exposure because some TiC participated during the formation of Ti(2)AIC.
关键词	SiCf/TiAl composites vacuum suction casting interfacial reaction product element diffusion
资助者	Innovation Fund of Institute of Metal Research, Chinese Academy of Sciences
DOI	10.11900/0412.1961.2021.00076
收录类别	SCI
语种	英语
资助项目	Innovation Fund of Institute of Metal Research, Chinese Academy of Sciences[2015-ZD03]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000841981600006
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/174555
专题	中国科学院金属研究所
通讯作者	Jia Qing; Yang Rui
作者单位	1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Shen Yingying,Zhang Guoxing,Jia Qing,et al. Interfacial Reaction and Thermal Stability of the SiCf/TiAl Composites[J]. ACTA METALLURGICA SINICA,2022,58(9):1150-1158.
APA	Shen Yingying,Zhang Guoxing,Jia Qing,Wang Yumin,Cui Yuyou,&Yang Rui.(2022).Interfacial Reaction and Thermal Stability of the SiCf/TiAl Composites.ACTA METALLURGICA SINICA,58(9),1150-1158.
MLA	Shen Yingying,et al."Interfacial Reaction and Thermal Stability of the SiCf/TiAl Composites".ACTA METALLURGICA SINICA 58.9(2022):1150-1158.