Tensile Fatigue Strength of Water-Quenched Hypoeutectoid Cu-10 wt%Al Alloy at High Temperature in Vacuum

Abstract

Tension and tensile fatigue tests of water-quenched Cu-Al alloy (β₂ phase) with 10 wt%Al have been performed at high temperature in vacuum. The relations among tensile strength σ_B (strain rate 0.003 s⁻¹), temperature T, cyclic tensile stress (of maximum value σ₀) and fatigue life N (number of stress cycles to fracture) are approximately given by
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\ oindentwhere N₀=10³, B=10, σ_B^*=8.24×10⁸ Pa, B^*=−6.5×10⁻⁶ K⁻², and T₀=270 K.
The expression of the tensile fatigue strength derived from known condition of fatigue failure and deformation is found to agree with the above experimental relation.