DEVELOPMENT OF TECHNOLOGY TO PRODUCE CAST ALUMINUM MATRIX COMPOSITE BY ALUMINA STRENGTHENING PHASE SYNTHESIS IN ALUMINUM MELT

Currently, critical components and assemblies made of traditional materials not always meet the increased requirements of designers and service conditions. One of the solutions to this problem is the development and application of dispersion strengthened metal matrix composites. According to the information analysis review, the paper suggests a new technology to produce dispersion strengthened aluminum-based composite. Features of the developed technology are specified along with both sample macroand microstructures and mechanical characteristics of as-cast samples. Strengthening particles are synthesized directly in the melt so that composites can be produced in a single stage with high thermodynamic stability, dense contact and good adhesion between the matrix and the strengthening phase. The reached particle sizes of a solid interstitial phase range from 3 μm to 2 mm. The structural and phase state of the produced material was studied using optical metallography and the X-ray diffraction analysis (Dron-2 diffractometer). The microstructure was investigated using the Keyence VHX-1000 microscope. Measurements were carried out using TKS-1M to determine microstructure, PMT-3 and HMV Shumadzu to determine hardness, ZD 10/90 and UME-10TM universal tensile testers to determine tensile strength, and MK-30a pendulum impact tester to determine impact strength. It is found that the variation in the strengthening phase size and content allows changing mechanical properties of cast metal over a wide range. Estimate calculations show an expected reduction in the cost of dispersion strengthened composite production.

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