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Abstract
The experimental planning method was used to find the optimal parameters in the aging process to improve the surface hardness of CuAl9Fe4 and CuAl9Fe4Ni2 copper alloys. In the experimental design, twelve samples after hardening were aged at temperatures of 250oC, 350oC, 450oC and 550oC for 1 to 3 hours, and statistical data on the hardness values of these samples were collected. The results obtained from the study were expressed through the hardness function depending on temperature and time for two different groups of samples. The optimal hardness achieved for CuAl9Fe4 alloy is 92.2 HRB when aging at 354oC for 2.21 hours and CuAl9Fe4Ni2 alloy aging at 382oC for about 2.03 hours. The results are completely consistent with the experiments and the analysis of the obtained microstructures.