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

Abstract

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 ␣/␤ 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 Ϸ17 times random, but after consolidation into composite form, it was Ϸ6 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 (Ϸ1.3 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.

Relating microtexture and dynamic micro hardness in an extruded AA8090 alloy and AA8090-8 vol% SiCpcomposite

“…Original grains are elongated along the extrusion direction together with the reinforcing particles. Though mechanical properties are often considered to be anisotropic and related to the bulk crystallographic texture [3][4][5], little is known on the possible linking between micromechanical response and the local orientation.…”