Plasticity of β-brass Single Crystals at Low Temperatures(Metallurgy)

概要

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The plasticity of β-brass single crystals, whose tensile axes lie relatively near the [001] direction, was investigated at temperatures ranging from 77°K to room temperature. It was found that the flow stress at 0.2% strain did not continuously increase with decreasing temperature but showed a peak value at about 195°K. The behavior is different from the temperature dependence of flow stress in ordinary bcc metals and alloys. The slip systems determined from the observation of surface traces are the {112}<111> at 77°K and the {110}<111> at room temperature. However, at the intermediate temperatures where the flow stress showed a peak value, two sets of slip traces or the slip plane between the basic {112} and {110} planes were observed depending on deformation temperatures. Therefore, the increase in flow stress at the intermediate temperatures is interpreted as an interaction between different slip systems or an occurrence of cross slip from the {110} or {112} basic slip plane. Below 115°K, the temperature dependence and the strain rate sensitivity of the flow stress are similar to those of ordinary bcc metals and alloys.