Effect of Cyclic Predeformation on the Uniaxial Tensile Deformation Behavior of [017] Cu Single Crystals Oriented for Critical Double Slip

The effect of cyclic predeformation at different plastic strain amplitudes γ pl on the uniaxial tensile behavior of the [017] critical double-slip-oriented copper single crystal was investigated. A cyclic predeformation at a low γ pl of 7.0 × 10−4 was found able to enhance the tensile strength of the [017] crystal at nearly no expense of the decrease in plasticity. However, as the γ pl for the prefatigue increases to a higher value of 3.0 × 10−3, the tensile strength of the prefatigued [017] crystal decreases to be slightly less than that of the unfatigued crystal, and simultaneously its tensile plasticity decreases markedly. Therefore, a cyclic predeformation at an appropriate plastic strain amplitude might bring about an obvious strengthening effect for metallic single crystals.