Na還元法Ti粉末を用いて作製したTiAl(Mn)反応焼結材の引張特性に及ぼすAl量の影響

概要

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Effect of Al content on the microstructure and room temperature tensile properties has been investigated using a series of titanium aluminides containing 40 to 53mo1%Al (Mn/Al=0.04) produced via a reactive sintering process. A sodium reduced titanium powder is used as a starting elemental titanium powder.<BR>The alloy having 40mol%A1 exhibits a coarse a<SUB>2</SUB> structure in addition to a duplex structure consisted of the lamellar grains and equiaxed γ grains. When Al content ranges from 42 to 50 mol%, the duplex structure is developed, and the volume fraction of equiaxed γ grains increases with increasing Al content. A single phase structure(equiaxed γ)is observed in the alloy containing 53mo1%Al.<BR>Tensile strength rises with increasing Al content up to 43.4mol%Al, after which the strength drops as Al content is increased. Elongation to fracture shows a similar tendency to the strength, although the maximum peak of elongation appears at 45mo1%Al.
社団法人粉体粉末冶金協会の論文