メカニカルアロイング法で作製したAlxTi100-x合金の特性

概要

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The characterization and consolidation of mechanically alloyed AlxTi100-x (x=25, 50, 75at%) powders were carried out. The phase changes of the processed powders with milling time were studied using x-ray diffraction and DSC. The MA powders were subsequently sintered by hot press. The phase, microstructure, relative density and hardness of the sintered compacts were studied using SEM, TEM, x-ray diffraction and vickers hardness tester. The existence of Ti solid solution with an amorphous phase in the powder sample with x=25 was confirmed as a final alloying stage. For the samples with x=50 and 75, the single amorphous phase and the fcc phase via an amorphous phase respectively were observed. The optimum MA times for sintering with respect to the chemical homogeniety, relative density, and hardness of the sintered compacts were found to be>180ks (x=25), >720ks (x=50), and between 180 and 720ks (x=75).