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Recently, heat-resistant aluminum alloy has been re-focused as a downsizing materials for the internal combustion engines. Heat-resistant Al alloy development and many researches are still ongoing for the purpose of improving thermal stability, high-tem-perature mechanical strength and fatigue properties. The conventional principle of heat-resistant Al alloy is the precipitation of inter-metallic compounds by adding a variety of elements is generally used to improve the mechanical properties of Al alloys. Heatresistant aluminum alloys have been produced by CrW homogeneous solid solution to overcome the limit of conventional heatresistant aluminum alloy. From EPMA, it is found that CrW homogeneous soild solution phases with the size of 50-100 µ m havebeen dispersed uniformly, and there is no reaction between aluminum and CrW alloy. In addition, after maintaining at high tem-perature of 573 K, there is no growth of hardening phase, nor desolved, but CrW still exists as a homogeneous solid solution.Key words: Heat resisting aluminium alloy, Homogeneous solid solution, Solid solution strengthening, Dispersion strengthening, Casting Al alloy |
