1989 Volume 75 Issue 9 Pages 1563-1570
In order to clarify the possibility of application of recently developed Si-Ti-C-O fiber to metal matrix composite, the compatibility of Si-Ti-C-O fiber with aluminium alloys and the mechanical properties of Si-Ti-C-O fiber/SiC powder hybrid fiber reinforced aluminium composite fabricated by using a squeeze casting method were investigated.
The main results obtained were summarized as follows.
(1) The drop in tensile strength of Si-Ti-C-O fiber immersed in molten pure aluminium and 6061 aluminium alloy is significantly smaller than that found with SiC(pc) fiber. From this fact, it is found that Si-Ti-C-O fiber has excellent compatibility with aluminium alloys.
(2) For the hybrid fiber reinforced aluminium composite, excellent mechanical properties of high flexural strength of 1.4 GPa in the longitudinal direction and particular high strength of 0.3 GPa in the transverse direction were attained because Si-Ti-C-O fiber uniformly dispersed and did not contact each other.
(3) No fiber surface is exposed in the transverse fracture surface and the dimple pattern showing ductile fracture behaviours is observed. This phenomenon shows that the Si-Ti-C-O fiber and matrix are tightly bonded
(4) Aluminium composite reinforced with the hybrid fiber maintains its flexural strength of 1.13 GPa in the longitudinal direction until approximately 573 K. The flexural strength in the longitudinal direction is not affected by the heat treatment time and has almost constant value during heat treatment at 623 K.
