Effects of Cr and Al Contents on the Preparation of SiC Fiber-Reinforced NiCrAl Alloy Matrix Composite
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Effects of Cr and Al Contents on the Preparation of SiC Fiber‑Reinforced NiCrAl Alloy Matrix Composite Haoqiang Zhang1,2 · Xixi Niu1,3 · Zhiliang Pei1 · Nanlin Shi1 · Jun Gong1 · Chao Sun1 Received: 7 September 2019 / Revised: 13 December 2019 © The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this work, the effects of Cr and Al contents on the preparation of SiC fiber-reinforced NiCrAl alloy matrix composites (SiCf/Ni–20Cr–5Al, SiCf/Ni–15Cr–5Al, SiCf/Ni–10Cr–5Al and S iCf/Ni–10Cr–3Al) were thoroughly discussed. The composites were prepared by vacuum hot pressing process using matrix-coated fibers. It was found that Cr solute atoms played a significant role in retarding the recrystallization of NiCrAl alloy matrix, and the Al elements in the form of γ′-Ni3Al phase had a suppression effect on the plastic flow of the matrix. Therefore, the reduction in Cr and Al contents was conductive to the recrystallization and plastic flow of NiCrAl alloy matrix, thereby reduced the size and number of micro-voids in the composite. In addition, this work provides some guidance for designing and manufacturing reasonable SiC fiber-reinforced Ni alloy matrix composites. Keywords SiC fiber · NiCrAl alloy · Composite · Recrystallization · Plastic flow
1 Introduction Tremendous demands are required on the development of materials with lightweight and high thrust-to-weight ratio in the aircraft and aerospace industries [1–6]. Generally speaking, Ni alloys are the most widely used aeronautical materials due to the excellent high-temperature mechanical property and corrosion resistance [7–12]. In recent years, continuous fiber-reinforced Ni alloy matrix composite becomes a potential substitute material in order to realize the mass-reduction goal for advanced aircraft engines. The similar composites have been prepared and investigated in the prior works [13–15]. For example, Zhang et al. prepared the SiC fiber-reinforced Ni matrix composite and researched Available online at https://link.springer.com/journal/40195. * Chao Sun [email protected] 1
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
3
University of Chinese Academy of Sciences, Beijing 100049, China
the plastic deformation mechanism of the matrix during the vacuum hot pressing (VHP) process [13]. Li et al. fabricated the SiC fiber-reinforced GH4738 matrix composite by means of hot isostatic pressing, measured the tensile strength of the material and analyzed the interfacial behavior [14]. Niu et al. prepared the SiC fiber-reinforced NiCrAl matrix composite and measured the interfacial residual stress on the basis of Raman spectroscopy [15]. The bulk of these studies is concerned with the preparation techniques and mechanical properties of the composites. However, the perfect composites with sufficient diffusion bonding of Ni alloy matrix have not be
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