Texture and residual strain in two SiC/Ti-6-2-4-2 titanium composites

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 31; no. 13; pp. 889 - 898
• Main Authors: Rangaswamy, P., Daymond, M. R., Bourke, M. A. M., Von Dreele, R., Bennett, K., Jayaraman, N.
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01.03.2000
• Subjects: Compressive properties; Continuous fibers; Load tests; Metal matrix composites; Modulus of elasticity; Silicon carbide; Strain; Texture; Titanium; Titanium base alloys
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-000-1008-z

Residual strain and texture variations were measured in two titanium matrix composites reinforced with silicon carbide fibers (Ti/SiC) of similar composition but fabricated by different processing routes. Each composite comprised a Ti-6242 α/β matrix alloy containing vol 35 pct continuous SiC fibers. In one, the matrix was produced by a plasma sprayed (PS) route, and in the other by a wiredrawn (WD) process. The PS and WD composites were reinforced with SCS-6 (SiC) and Trimarc (SiC) fibers, respectively. The texture in the titanium matrices differed significantly. The titanium matrix for the PS material exhibited random texture pre and post fabrication of the composite. For the WD material, the starting texture of the monolithic titanium matrix was ≈17 times random, but after consolidation into composite form, it was ≈6 times random. No significant differences were noted in the fiber-induced matrix residual strains between the composites prepared by the two procedures. However, the Trimarc (WD) fibers recorded higher (≈1.3 times) compressive strains than the SCS-6 (PS) fibers. Stresses and stress balance results are reported. Plane-specific elastic moduli, measured in load tests on the unreinforced matrices, showed little difference.