JSC “Kompozit”, Korolev, Russia:

V. N. Mironenko, Chief Specialist, e-mail: info@kompozit-mv.ru
V. V. Vasenev, Head of a Sector

Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia:
S. Yu. Petrovich, Head of Laboratory

Academician Pilyugin Center, Moscow, Russia:
I. V. Myshlyaev, Head of Laboratory

We investigated the structure and properties of compact billets and pressed rods of hypereutectic powder CAC-1 silumins, produced from the powder with particles size from 20 to 315 micron. Billets and rods have high level of heterogeneity which changes due to thermomechanical influence during degassing as well as compacting and pressing. By decreasing the initial particle size from 315 to 20 micron we reduce the basic phases: primary silicon, (Al) – Si-eutectic and Al₃Ni. The thermal coefficient of linear expansion (TCLE) of alloys, made from 0,1–315 micron particles, depends on alloy composition and temperature. It is additively summarized from TCLE of alloy components and slightly depends on phase structure and morphology. TCLE of billets and rods, made of range covered particle sizes, is close and decreases by 15–16% as a result of mechanical activation of the powder. The density of billets and rods depends only on actual composition and is close to the estimated level. Physicalmechanical properties of billets and rods correlate well with the structure of the samples. An increased size of particles decreases the physical and mechanical properties, while plastic deformation decreases hardness of both billets and rods. The disperse structure of CAC-1-50 is more durable than CAC-1-400. A lower hardness of CAC-1-400 provides an increased manufacturability in material cutting. Mechanical activation and increased hardness make the cutting much more complicated. As far as usage is concerned, CAC-1-50 supersedes CAC-1-400 in terms of structure homogeneity and mechanical properties. However, CAC-1-400 is more manufacturable by cutting.

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