An investigation of the effects of microstructure on fatigue damage in a symmetric []2s silicon carbide (SCS6) fiber-reinforced titanium matrix composite

The tensile behavior of a silicon carbide fiber-reinforced titanium matrix composite

“…The slip bands were observed to nucleate at the matrix/fiber interfaces (Figure 5a). Similar slip band initiation mechanisms have been observed in previous studies by Majumdar and co-workers [ 15] for the 0 degree and 90 degree Ti-15-3/SIC (SCS-6) composites. The stress-strain behavior of the Ti-15-3/SiC (SCS-6) composite is linear in the microplasticity regime, as is typically observed for conventional monolithic materials.…”

“…Slip band initiation was also observed to occur in regions between the 0 and 90 ~ plies (Figure 6a). The slip bands showed distinct evidence of initiation by the localization of strain in the immediate vicinity of interfacial/reaction zone cracks (Figure 6b), as reported by Majumdar and coworkers for the 0 and 90 degree composites [15,16]. Both slip band intersection and debonding were observed at load levels corresponding to 0.5tr u in the (Figure 6b).…”

“…In recent years, titanium matrix composites with a variety of reinforcement architectures have been considered for a spectrum of intermediate temperature (500-700~ structural applications due in particular to their attractive combinations of high strength and mechanical/physical property retention at elevated temperatures [1,2]. The potentially far-reaching applications of titanium matrix composites (TMCs) having different reinforcement architectures have engendered considerable scientific and technological interest, creating an immediate need for focused studies aimed at understanding the underlying mechanisms and micromechanisms governing quasi-static and cyclic deformation [3][4][5][6][7][8][9][10][11][12][13][14], damage and associated fracture or failure modes [15][16][17].…”

“…Current understanding of the effects of microstructure on mechanisms and micromechanisms governing damage initiation, propagation and failure in titanium matrix composites is still very limited [14][15][16][17][18]. Several earlier studies have shown evidence that a complex damage situation is associated with deformation and failure under monotonic and cyclic thermal or mechanical loading [10][11][12][13][14][15][16][17].…”

“…Several earlier studies have shown evidence that a complex damage situation is associated with deformation and failure under monotonic and cyclic thermal or mechanical loading [10][11][12][13][14][15][16][17]. In fact, in both titanium alloy and titanium aluminide metal matrices reinforced with continuous ceramic fibers, maximum tensile stresses develop in the matrix, while maximum compressive stresses develop in the fibers during the minimum temperature portion of a thermal cycle [19].…”