Elasticity, Anelasticity and Yield Strength of Al-Si Alloys Obtained by Directional Crystallization
Acoustic measurements of Young’s modulus and internal friction at frequencies of longitudinal vibrations of about 100 kHz were made in the (5×10-7 to 2×10-4) vibration strain amplitude range for Al-Si alloys. Quasi-static bending stress-strain diagrams were studied as well. The samples of the alloy were prepared using a directional crystallization by Stepanov’s method. The compositions varied from 8 to 25 wt.%Si. The micro-plastic deformation of the materials (acoustic experiments) is explained by dislocation motion in grains of α solid solution. The micro-plastic yield stress has a minimum near the eutectic composition; the flow stress of plastic bending increases smoothly when the Si content increases.
Robert Schaller and D. Mari
S.P. Nikanorov et al., "Elasticity, Anelasticity and Yield Strength of Al-Si Alloys Obtained by Directional Crystallization", Solid State Phenomena, Vol. 184, pp. 161-166, 2012