Computing strain rate sensitivity of aluminium alloy 1050

The strain rate sensitivity of commercial aluminium alloy 1050 (or AA1050) was calculated using uniaxial tensile test results. The experimental data were collected from hot uniaxial tensile test carried out according to E-2448 standard at different strain rates and testing temperatures. The results were analysed to approximate the optimum value of strain rate sensitivity (m-value) for commercial AA1050 tempering H14 with no additional heat treatment or microstructure altering. The strain rate sensitivity was determined by implementing the uniaxial tensile test data in creep law and by plotting the strain rate-flow stress curve. The formulation of the problem was demonstrated for Bailey-Norton law time hardening and strain hardening governing equations. The results presented low strain rate sensitivity of AA1050-H14 at 100 oC, 200 oC, 300 oC, and 500 oC for the selected pure plastic strains before necking zone. The maximum m-value for uniaxial tensile tests was found to be about the probe strain of 4% at 300 oC forming temperature under loading with the strain rate of 0.0005 s-1