Abstract
This paper decribes the facts that aluminum alloys containing dispersed TiC were little strengthened with the increase of TiC contents up to 50%, however, they were very hardened by heat treatment.For example, when the alloys were kept holding at 650°C, their values of hardness number were raised from Hv 60 (initial) to 110 (final) in 13% TiC alloy, from Hv 55 to 150 in 16% TiC alloy, and from Hv 80 to 610 in 50% TiC alloy.The hardening phenomena may be due to the decomposition of TiC in aluminum by heat treatment for the formation of Al3Ti and Al4C3. The grain size of Al3Ti was about 10μ and that of Al4C3 was about 2 5 μ. These small particles were homogeneously dispersed in aluminum matrix.
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