Abstract
The composite studied in the present investigation was a powder metallurgy 2XXX series alloy, designated MB-85 containing in wt. % : 3.5 Cu, 1.5 Mg, 0.4 Zr, 0.21 Mn, Bal A1 reinforced with 15 volume percent silicon carbide particulate (average size 13 microns). Heat treatments consisted of solution treatment at 495 C/4 hours, followed by a cold water quench and artificial aging at 190 C/3 hours to produce a composite in the underaged condition. The backing material used in the laminated specimen was nominally a 6061 aluminum alloy. The initiation and growth toughness of the composite and the monolithic 6061 alloy were tested using a compact tension specimen geometry. The effect of the ductile backing on retarding crack propagation was studied. The proportion of the 6061 alloy thickness in the laminated specimen was about 25%. Enhancement in the crack growth toughness is achieved because more energy is required to initiate and propagate a crack in the 6061 backing in comparison to the composite as originally proposed. Thus one can take advantage of the enhancement in stiffness and strength offered by the incorporation of a very strong reinforcement without overly sacrificing the flaw tolerant nature of aluminum alloys.
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