Herein we present an experimental investigation on the toughness evaluation method for the samples of copper and aluminum, which are generally employed as electronic equipment parts, through the miniaturized version of the Charpy impact test. Overall, the resulting high reproducibility of the absorbed energy values informed by the miniaturized Charpy impact test can be witnessed; moreover, it is possible to compare the values given by the Japanese industrial standard (JIS) Charpy impact test to those given by the miniaturized Charpy impact test and correction factors were calculated accordingly. [
With their excellent balance of strength, electrical conductivity and ductility, copper alloys are widely applied. However, miniaturized products must be high-strength while maintaining high electrical conductivity. Herein, we analyze whether severe plastic deformation can improve the aging property of copper alloy. We experimentally investigated the aging properties and microstructures of CuCrZr alloys after a remarkable torsional plastic deformation (RMACREO) process. The RMACREO-processed specimen exhibited a lower aging temperature than the solution-heat-treated specimen without degrading the Vickers hardness and electrical conductivity. We suggest that the RMACREO process introduced a large amount of distortion in the microstructure and generated a sub-grain structure. The RMACREO process apparently decreased the generation activation energy of the chromium precipitates, thereby decreasing the aging temperature.
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