EFFECTS OF HIGH-ENERGY BALL MILLING ON STRUCTURE AND MECHANICAL PROPERTIES OF L1₂INTERMETALLIC COMPOUND Al₆₇Mn₈Ti₂₅

来源期刊：中国有色金属学报(英文版)1998年第3期

论文作者：Fu Yunyi Wan Qian Hu Gengxiang

文章页码：412 - 416

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

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%.