Development of Multi-Principal Element Alloys W_19.8Mo_19.8Nb_19.8Ti_19.8Cr_19.8Al₁ (At. %) Through Mechanical Alloying Process

Refractory multi-principal element alloys constitute a novel category of metallic materials, and they have good properties, particularly at elevated temperatures. Currently, casting and powder metallurgy stand as the two predominant manufacturing routes. This study focuses on the production of the W_19.8Mo_19.8Nb_19.8Ti_19.8Cr_19.8Al₁ (At. %) alloy via the mechanical alloying process. Analyses of morphology and particle size distribution at intervals of 12, 24, 36, and 48 hours of milling showed a gradual decrease in particle size according to increase in milling time. The XRD showed the presence of the BCC phase after 48 hours of milling, and the application of the Williamson-Hall methods indicated that after 12, 24, and 36 hours of milling, the crystallite size decreased and the microstrain increased gradually. However, after 48 hours of milling, there was an increase in these values, suggesting the reordering of the structure of this alloy. In addition, Fe contamination increases significantly for higher milling time.

Keywords:
Multi-principal element alloys; Mechanical alloying; Crystallite size; Williamson-Hall method