โ Scribed by Ram B. Bhagat; Michael B. House
No coin nor oath required. For personal study only.
The aging characteristics, elevated-temperature strength and stiffness as well as creep deformation of aluminum alloy 6061 composites reinforced with silicon carbide (SIC) whiskers (V f= 0.20) have been studied. The peak hardness for this composite was 148 kgf mm 2 after aging for 18 h at 150ยฐC and 138 kgf mm 2 after aging for 1 h at 200 ยฐC following solutionization for 15 rain at 530 ยฐC. The maximum tensile strength was retained after aging for 18-55 h at 150 ยฐC, an improvement of 40% over that of wrought aluminum. The tensile strength of the received composite decreases from 578 MPa at room temperature to 229 MPa at 350 ยฐC. In terms of the use temperature, the composite provides an advantage of approximately 200ยฐC over that of wrought aluminum. Young's modulus for the composite remains almost constant ( 104 GPa) from 150 to 350 ยฐC, and it is 58% higher than that of the wrought aluminum at 150 ยฐC.
Experimentally determined values of the steady state creep rate range from 4.9 z 10 ~ to 1.3 x I0 ~' s-L for the composite which shows substantial resistance to creep deformation with respect to the wrought aluminum alloy. The activation energy and stress exponent for the composite are reported and discussed.
๐ SIMILAR VOLUMES
The fracture resistance of a Sic whisker/AlzO, matrix composite for the test temperature range of 20" to 1400ยฐC was determined using chevron-notched and straightnotched, three-point bend specimens. Crack mouth opening displacement (CMOD) was continuously monitored throughout the fracture tests, usin
Th& paper presents an integrated study of the processing and mechanical properties of a SiC platelet/alumina composites. The major goal was to investigate the potential application of plate-like particles in toughening ceramic matrices. In the processing part of the study, the microstructures were f
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