Актуальные проблемы в машиностроении. Том 12. № 3-4. 2025 Материаловедение в машиностроении ____________________________________________________________________ 63 TECHNOLOGY AND MODES FOR OBTAINING DISPERSION-STRENGTHENED Cu-Al-C-O COMPOSITES BASED ON POWDERED COPPER Vladimirova Yu. O., Ph.D. (Engineering) student, e-mail: yulivladimirova@mail.ru Plotnikov V.V., Ph.D. (Engineering) student, e-mail: acc_plotnokov@tambler.ru Shalunov E.P., Ph.D. (Engineering), Professor, e-mail: shalunov2003@mail.ru I.N. Ulianov Chuvash State University, 15 Moskovsky Prospekt, Cheboksary, 428015, Russian Federation Abstract The paper analyzes all stages of the technological process and modes for obtaining dispersionstrengthened composite materials (DSCMs) based on copper of the Cu-Al-C-O system, containing in the initial powder composition (wt.%): Al — 3.0; C — 0…0.9; Cu — balance. The technology for obtaining these materials is based on the method of reactionary mechanical alloying (RMA) in an attritor. It ensures the formation of nanodispersed aluminum oxide particles during processing of copper and aluminum powders in air. These particles are dispersed into the copper matrix, thereby creating its dispersion strengthening, which gives such materials high mechanical properties. To ensure the effective operation of products made of these materials under high specific loads (500…700 MPa) and high temperatures (600…900 °C), it is necessary to use a copper DSCM with 3.0 wt.% Al, 0.45 wt.% C, 0.025…0.030 wt.% O2 (Cu — balance), and the production of semifinished products from it should be carried out by hot extrusion with an extrusion ratio of 16. In this case, the tensile strength is 722 MPa, the compressive strength is 815 MPa, and the hardness is 195 HB, with a softening temperature of at least 970 °C. Keywords Dispersion-strengthened composite materials, copper, aluminum oxide, carbon, reactionary mechanical alloying (RMA).
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