Small Punch Testing of Al-4 vol. % A1_4C_3 Composite in Creep Conditions

摘要

Creep behavior of the composite based on aluminium matrix reinforced by 4 vol. % Al_4C_3 has been studied at temperatures from 623 and 723 K by small punch testing with a constant force. The time dependence of the central deflection was registered and the minimum deflection rate was determined. The dependence of this quantity on applied force can be described by power function with relatively high value of power. The dependence can be rationalized by an analysis in terms of threshold concept. Analytical procedure was given for comparing threshold force in small punch experiments and threshold stress in conventional creep testing.