Microstructural Difference between Unreinforced Canning of TC17 Alloy and the Matrix in SiC_f/TC17 Composite Fabricated by HIP Process

Abstract:

Continuous unidirectional SiC_f/TC17 composite has been fabricated by hot isostatic pressing (HIP). After consolidation, the TC17 canning (the unreinforced ambient portion of the specimen) showed an equiaxed microstructure, whereas the matrix of SiC_f/TC17 composite (deposited on the continuous SiC fibers by magnetron sputtering) exhibited a typical lamellar structure. In this work, the heat treatments under different condition, XRD, SEM and WDS have been employed to characterize and analyze the microstructural difference. The results indicated that the difference in β transus temperature (T_β) between the canning and matrix of TC17 alloy induced the microstructural diversity. The introduction of C element (an intensive α stabilizing element) into the matrix alloy may be ascribed to the diffusion of carbon layer at the surface of SiC fiber. As a result, T_β of matrix TC17 alloy increased to above 1000 °C, much higher than that of the canning TC17 alloy (890 °C). The investigation of microstructure difference reveals the microstructure evolution in SiC_f/TC17 composite, which can provide an effective reference for following processing design.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 402-408
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.402
• Online since: March 2016
• Authors: Min Juan Wang, Hao Huang, Si Qing Li, Hu Li, Chuan Xie, Xu Huang
• Keywords: Magnetron Sputtering, Microstructure, SiC_f/TC17 Composites, T_β

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