Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia

A. V. Aborkin, Associate Professor, Chair for Mechanical Engineering Technology, Candidate of Technical Sciences, e-mail: aborkin@vlsu.ru
E. S. Prusov, Associate Professor, Chair for Technologies of Functional and Structural Materials, Doctor of Technical Sciences, e-mail: eprusov@mail.ru

V. V. Ryabkova, Junior Researcher, e-mail: vvryabkova@mail.ru

Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia¹ ; Wuhan Textile University, Wuhan, China² ; NUST MISIS, Moscow, Russia³

V. B. Deev, Professor, Faculty of Mechanical Engineering and Automation², Chief Researcher¹, Professor of The Chair for Metal Forming³, Doctor of Technical Sciences, Professor, (Corresponding Author), e-mail: deev.vb@mail.ru

Data are presented on the effect of iron impurities on the structure, phase composition and mechanical properties of consolidated billets from powder composites obtained by solid-phase processing of non-compact waste cast aluminum matrix composite materials AK12och + 10% (vol.) SiC. Consolidation of the composite powder obtained by grinding and initial chips was carried out using a mold heated to 450 ^oC at a pressure of 330 MPa. It has been shown that preliminary mechanical processing of composite chips in a planetary ball mill at a rotation speed of 400 min–1 and a total processing time of 4.5 hours leads to an improvement in the homogeneity of the matrix alloy structure, a reduction in the structural components size, a decrease in the average size of reinforcing particles and an increase in their homogeneity distribution in the perform volume. The presence of iron impu rities up to 1% (wt.) in the matrix alloy slightly reduces mechanical properties of consolidated samples made from recycled powder composite material. On the contrary, an increase in the iron content to 2% (wt.) promotes an increase in the proof strength and compressive strength of the composite material AK12och + 10% (vol.) SiC after solid-phase recycling. After preliminary grinding of chips, the plate-like inclusions of the β-Al5FeSi phase present in the cast samples are dispersed and uniformly distributed in the volume of the powder mixture, acting as an additional reinforcing phase in consolidated samples and preventing the deformation of the matrix material under loading, which can improve mechanical properties of the composites. The results obtained indicate the feasibility of solid-phase processing of waste from mechanical processing of castings made of aluminum matrix composites for production of consolidated billets using powder metallurgy methods.

The study was supported by the Russian Science Foundation grant No. 21-79-10432, https://rscf.ru/project/21-79-10432/.

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