Interfacial Reaction and Thermal Stability of the SiCf/TiAl Composites

doi:10.11900/0412.1961.2021.00076

Acta Metall Sin

2022, Vol. 58

Issue (9): 1150-1158 DOI: 10.11900/0412.1961.2021.00076

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Interfacial Reaction and Thermal Stability of the SiC_f/TiAl Composites

SHEN Yingying¹^,², ZHANG Guoxing¹, JIA Qing¹(

), WANG Yumin¹, CUI Yuyou¹, YANG Rui¹(

)

^1.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

SHEN Yingying, ZHANG Guoxing, JIA Qing, WANG Yumin, CUI Yuyou, YANG Rui. Interfacial Reaction and Thermal Stability of the SiC_f/TiAl Composites. Acta Metall Sin, 2022, 58(9): 1150-1158.

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Abstract

SiC-fiber-reinforced γ-TiAl 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 SiC_f/TiAl composites were investigated by thermal exposure for different time. First, the SiC_f/TiAl 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^oC 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)₅Si₄, and Ti₃Sn + Ti₂AlC layers, respectively, were observed. Finally, the formation mechanism of the interfacial reaction products and element diffusion of SiC_f/TiAl composites under different conditions were studied, the interfacial stratification occurred during thermal exposure because some TiC participated during the formation of Ti₂AlC.

Key words: SiC_f/TiAl composites vacuum suction casting interfacial reaction product element diffusion

Received: 17 February 2021

ZTFLH:

TG146.2

Fund: Innovation Fund of Institute of Metal Research, Chinese Academy of Sciences(2015-ZD03)

About author: YANG Rui, professor, Tel: (024)23971512, E-mail: ryang@imr.ac.cn;JIA Qing, professor, Tel: (024)83978843, E-mail: qjia@imr.ac.cn

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	Yingying SHEN
	Guoxing ZHANG
	Qing JIA
	Yumin WANG
	Yuyou CUI
	Rui YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00076 OR https://www.ams.org.cn/EN/Y2022/V58/I9/1150

Fig.1 Schematic of the cross section of the SiC fiber coated with titanium alloy

Fig.2 Cross-section SEM image of SiC_f/TiAl composite prepared by vacuum suction casting

Fig.3 SEM image and EDS line scanning results of as-processed SiC_f/TiAl composites from the fiber to the matrix (Area I is the interfacial reaction layer, area II is the titanium alloy coating, area III is the transition layer between the titanium alloy coating and the matrix alloy, and area IV is the TiAl matrix alloy)

Fig.4 TEM images of the reaction products and the corresponding selected area electron diffraction (SAED) patterns of as-prepared SiC_f/TiAl composite
(a) TEM image of SiC fiber and interfacial reaction layer and corresponding SAED patterns
((b) local enlarged view of the interfacial reaction products and corresponding SAED patterns

Fig.5 SEM images of interfacial reaction layer and matrix of SiC_f/TiAl composite after thermal exposure at 800^oC for 25 h
(a), 50 h (b), 100 h (c), 150 h (d), and 200 h (e)

Table 1 Thicknesses of interfacial reaction layer and carbon layer of SiC_f/TiAl composite after thermal exposure at 800^oC for different time

Fig.6 Interfacial reaction kinetic curves of SiC_f/TiAl composites at 800^oC (t—thermal exposure time)

Table 2 EDS analysis results of points A and B in Fig.5e

Fig.7 TEM image of the reaction products and the corresponding SAED patterns after thermal exposure at 800^oC for 200 h
(I—fine-grained TiC layer, II—coarse-grained TiC layer, III—(Ti, Zr)₅Si₄ layer, IV—Ti₃Sn + Ti₂AlC layer)

Fig.8 Schematic of the formation and growth of interfacial reaction products during thermal exposure

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