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在高能球磨过程中， Ａｌ６７Ｍｎ８Ｔｉ２４Ｎｂ１复相合金的 ＤＯ２２结构第二相逐步固溶入 Ｌ１２基 体， 且基体有序度降低，球磨１０ｈ后第二相完全被溶入，合金呈弱有序的 ｆｃｃ结构，亚稳态粉末在热压成 形过程中发生重有序化转变，形成细密的复相结构成形合金的显微组织由Ｌ１２基体和弥散分布的 ＤＯ２２ 结构Ａ１３（Ｔｉ，Ｎｂ）第二相组成，与铸态相比，组织明显均匀井细化Ａｌ６７Ｍｎ８Ｔｉ２４Ｎｂ１粉末热压成形 合金的室温压缩强度明显提高，塑性改善，断裂韧性提高
During high-energy ball milling, the second phase of DO22 structure of Al67Mn8Ti24Nb1 complex phase alloy gradually dissolves into the L12 matrix, and the order of the matrix decreases. After milling for 10h, the second phase is completely dissolved and the alloy has a weakly ordered fcc structure. Metastable powder during hot press forming process of the orderly transformation occurred to form a fine complex structure of the microstructure of the alloy formed by the L12 matrix and diffused DO22 structure A13 (Ti, Nb) second phase composition, and Compared with the as-cast state, the compressive strength of Al67Mn8Ti24Nb1 powder hot-press-forming alloy with uniform and finely-distributed microstructure is obviously improved at room temperature, the plasticity is improved and the fracture toughness is improved