Abstract
Age hardening in a Cu-2.5 wt pct Ti alloy has been examined as a function of aging time at 300 and 500 °C. Yield strength results exhibited a double peak in strength at each temperature,i.e., peaks at two different times. The work-hardening rate, however, increased monotonically with aging time. Slip line measurements showed that slip became coarser with aging time but remained planar. Lack of sufficient understanding of the details of the pzecipitation reactions and also of hardening mechanisms means that a convincing explanation of the double peak in strength cannot yet be made, but research needed to correct this situation was identified.
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