Optimization of the technology of reprocessing of mechanically alloyed dispersion-strengthened nickel compositions into semifinished products
The paper gives the results of the optimization of annealing and extrusion of two mechanically alloyed compositions obtained from the mixture of powders of nickel ПНК-ОТ2 and aluminum ПА4 (3 %), and also the mixture of nickel ПНК-ОТ2, aluminum ПА4 (1,5 %) and molybdenum oxide MoO3 (3,5 %) of ХЧ grade. The optimal area is defined and described by applying the central compositional orthogonal planning of the second order. It is determined that the alloys obtained by using the optimal technology are high-strength alloys and in the temperature range of 20…1000 0С their strength is not less than 1,5 times higher than that of their analogs, but they are inferior to the latter as far as their plasticity is concerned. The complex-doped alloy with the master strengthening phase Al2O3 has higher strength at high temperatures than the binary alloy strengthened by nickel aluminide Ni3Al.