J. Warren et al., FIBER DAMAGE DURING THE CONSOLIDATION OF PVD TI-6AL-4V COATED NEXTEL 610(TM) ALUMINA FIBERS, Acta metallurgica et materialia, 43(10), 1995, pp. 3605-3619
Citations number
30
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Titanium matrix composites reinforced with sol-gel synthesized alpha-a
lumina fiber tows have attracted interest as a potentially low cost co
ntinuous fiber reinforced metal matrix composite system. We have condu
cted a detailed investigation of fiber damage during high temperature
consolidation of PVD Ti-6Al-4V metallized sol-gel alumina fiber tows.
Using both hot isostatic pressing and interrupted vacuum hot press con
solidation cycles, the two principal mechanisms of fiber damage have b
een experimentally identified to be microbending/fracture and fiber ma
trix reaction. A time dependent micromechanics model incorporating the
evolving geometry and mechanical properties of both the fibers and ma
trix has been formulated to simulate the fiber bending/failure mechani
sm in a representative unit cell and explore the effect of fiber stren
gth loss due to reaction with the matrix. This model has been used to
design a process cycle that minimizes damage by exploiting the enhance
d superplastic deformation of the initially nanocrystalline PVD Ti-6Al
-4V matrix.