{'fraction_non_alphanumeric': 0.0378619153674833, 'fraction_numerical': 0.02746844840386043, 'mean_word_length': 4.502040816326531, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Effects of aging treatment on mechanical and electrical properties of Cu-Co-(Ti) alloys

A non-toxic and high-temperature resistant high strength and high electrical conductivity copper alloy was designed to replace Cu-Co-Be alloys in this work. The Cu-0.13 wt% Co and Cu-0.06 wt% Co-0.08 wt% Ti alloys were prepared by melting method and subjected to solid solution, cold rolling and aging treatments. The changes of hardness and electrical conductivity of the alloys during aging were tested. The microstructure of the alloys was observed by metallographic microscope and transmission electron microscope. The results showed that when the Cu-0.13 wt% Co alloy was aged at 400°C, the electrical conductivity was slightly increased while the hardness was greatly reduced with the prolongation of aging time. The electrical conductivity of the Cu-0.06 wt% Co-0.08 wt% Ti alloy was obviously increased and the hardness remained almost unchanged after aging for 24 h at 400°C. There was no second phase in both alloys before aging treatment. The CoTi x precipitates were found in the Cu-0.06 wt% Co-0.08 wt% Ti alloy after aging at 400°C. The average size of the precipitates was 15 nm. The effects of age-hardening and matrix-purification of the precipitation were the keys to obtain good mechanical and electrical properties of the Cu-Co-Ti alloys.