Effect of different processing on the microstructure and mechanical properties of Al_(67)Mn_8Ti_(24)Nb_1 alloy

摘要

The microstructures and mechanical properties of a Nb-modified multiphase Al_3Ti-based alloy prepared by different techniques such as-cast, spray forming and mechanical milling have been investigated. The dendrites in the as-cast Al_(67)Mn_8Ti_(24)Nb_1 experienced considerable fragmentation in the spray forming or ball milling process. The microstructure with an equiaxed L1_2 matrix and homogeneous distributed second phase was obtained in almost all part of the spray formed deposit and its porosity was low. Al_(67)Ti_(24)Mn_8Nb_1 alloy consolidated from high energy ball-milled powders shows higher strength and better fracture toughness than as-cast or sprayed alloy, which result in fine grain size about 1 mu m and the secondary phase particles were refined to the order of hundred nanometers in the ball-milled powder consolidated alloy.