Abstract:Al₆₇Mn₈Ti₂₅powder was produced by high-energy ball milling and then consolidated by vacuum hot pressing and hot isostatic pressing. The effects of mechanical milling on the structure and properties of the alloy had been investigated. The results show that the long range order parameter of L12structure decreased rapidly in the early stage of milling. After 5h milling, the material is completely disordered, forming a FCC solid solution. By further milling to 60h, the powder transformed to purely amorphous state. Bulk specimens were fabricated from the disorder FCC powder by hot pressing at high temperature. The microstructure of the consolidated alloy consists of fine equiaxed grains with tiny particles of dispersed Al₂O₃at grain boundaries and in the grains. Remarkable improvement of strength and promising compressive ductility are exhibited by this experimental alloy. The yield strength(σ_0.2)and fracture strength(σ_b)are 546 MPa and 1 471 Mpa respectively, and the compressive ductility(δ_p)is 17%.

Key words: Al₆₇Mn₈Ti₂₅alloy　high-energy ball milling　powder metallurgy　structure evolution intermetallic compound