Elevated Temperature Properties Of A Dispersion Strengthened Al [Fe, V, Si] Alloy
Cissel, Matthew B.
McNelley, Terry R.
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The mechanical properties at elevated temperatures of a new dispersion strengthened aluminum, iron, vanadium silicon alloy were evaluated. Constant extension rate (tension) tests were conducted on an Instron machine and strain rate sensitivity, yield stress and elongation changes with temperature were obtained. The mechanical behavior appeared to change at approximately 250 degrees C, with intergranular fracture and necking occurring at low temperatures; and transgranular dimples with uniform plastic deformation at high temperatures. Creep tests in tension were conducted and the stress dependence n, of the steady state creep rate was obtained. A change in the n value was seen from 16 down to 4 at low stresses and temperatures. The activation energy for creep was calculated from the slope of steady state creep rate vs 1/temperature plot and from an iterative technique based on plotting all the data on one curve using an approximate value of activation energy for the temperature compensated strain rate plotted against the modulus compensated stress.
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