Abstract
The authors have recently reported electron microscopy (CTEM and HREM) observations of mechanical twinning in age hardened copper-titanium alloys containing a fine dispersion of the metastable Cu{sub 4}Ti ({beta}{prime}; D1{sub a}) phase ({approx}15 vol%). These particle hardened alloys are known to twin profusely and it has been suggested that single crystals of Cu-Ti-Al alloys containing coherent Cu{sub 4}Ti (D1{sub a}) particles yield by twinning at the onset of plastic flow. In this short paper conventional (CTEM) and high-resolution (HREM) electron microscopy observations of twin/twin intersections in the precipitation hardened two-phase copper-titanium alloys are reported. These results will suggest that the mechanisms governing shear accommodation in obstacle twins remain to be elucidated.
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