Mixtures of aluminum with a second phase of high hardness do not obey the additivity rule with respect to the hardness and strength as a function of the hard phase concentration. A region of concentrations exists in which the hardness and resistance to crushing are independent of the hard phase concentration.
In the region of high concentrations of the hard phase approaching close packing the resistance in compression (hardness) and the resistance in tension (crushing force) vary in diametrically opposite directions—the hardness increases and the crushing strength decreases.
It was shown that it is possible to estimate the tendency to chemical interaction between phases by the variation of hardness with high-temperature heating. The chemical interaction of aluminum with corundum was found to be weak or nonexistent.
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Burminskaya, L.N., Zaboleev-Zotov, V.V., Nikulin, Y.M. et al. Strength of two-phase aluminum-base mixtures. Met Sci Heat Treat 9, 430–432 (1967). https://doi.org/10.1007/BF00657587
- Opposite Direction
- High Hardness
- Chemical Interaction