Room temperature mechanical properties and tensile creep behavior of powder metallurgy processed
and hot rolled Al and its composites with 5, 10, 15 and 20 vol.% SiC particulate reinforcements, have
been evaluated. The cracks introduced in particles or at particle–matrix interfaces of the composites by
hot rolling are found to increase with SiC volume fraction, and adversely affect mechanical properties.
Although dynamic Young’s modulus, matrix microhardness, yield and ultimate tensile strengths increase
moderately with SiC content, yet the differences between moduli obtained experimentally and from rule
of mixtures increase due to poor interfacial load transfer. Creep curves obtained at 21 MPa and 623 K
show primary, secondary and tertiary regimes, with steady state creep rate increasing and time to rupture
decreasing with increasing SiC volume fraction following Monkman–Grant relationship. Studies of tensile
and creep fracture surfaces have revealed matrix and particle–matrix interfacial damage, respectively as
having dominant role in failure.
Room temperature mechanical properties and tensile creep behavior of powder metallurgy processedand hot rolled Al and its composites with 5, 10, 15 and 20 vol.% SiC particulate reinforcements, havebeen evaluated. The cracks introduced in particles or at particle–matrix interfaces of the composites byhot rolling are found to increase with SiC volume fraction, and adversely affect mechanical properties.Although dynamic Young’s modulus, matrix microhardness, yield and ultimate tensile strengths increasemoderately with SiC content, yet the differences between moduli obtained experimentally and from ruleof mixtures increase due to poor interfacial load transfer. Creep curves obtained at 21 MPa and 623 Kshow primary, secondary and tertiary regimes, with steady state creep rate increasing and time to rupturedecreasing with increasing SiC volume fraction following Monkman–Grant relationship. Studies of tensileand creep fracture surfaces have revealed matrix and particle–matrix interfacial damage, respectively ashaving dominant role in failure.
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