OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 Ta b l e 2 Impact Test Results No. Specimen Joules 1 Aluminium foam 4 2 Solid Aluminium 6 Rockwell hardness test For the Rockwell hardness test, a rectangular sample was cut out of aluminium foam. A ball indenter made of high-carbon steel (1/16’’) was chosen for testing. Initially, a minor load of 10 kgf was applied to the surface of the material, this minor load does not depend on the material. After that, the main load of 100 kgf was applied to the surface of the material for 30 seconds. The hardness value was measured in three tests, the corresponding hardness values are shown in table 3. It was observed that the resulting aluminium foam has a high hardness compared to the parent aluminium material. Specimen 1 is the aluminium foam obtained in the work, and Specimen 2 is the parent solid aluminium. Ta b l e 3 Rockwell Hardness test results (HRB) Specimen Trail 1 Trail 2 Trail 3 Average Specimen 1 77 76 80 77.6 Specimen 2 24 28 25 25.6 Compression test The compressive strength of the aluminium foam material was determined on a compressiontesting machine (C.T.M). To do this, rectangular specimens were cut out of aluminium foam material and parent solid aluminium, after which the specimens were placed on the C.T.M table and a load was applied to it. After applying a compressive load, both specimens were deformed, and its size changed, as shown in fig. 10, a, b. The resulting compressive strength for aluminium foam and the parent aluminium material is 607 kN and 493 kN, respectively. a b Fig. 10. Deformed aluminium foam (a), parent material (b)
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