Zn-22Al合金粉末成形体の変形挙動(第2報) : 変形挙動に及ぼす粉末の粒径と試験温度の影響

概要

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Forward extrusion of green compacts of 78zinc-22aluminium prealloy powder is carried out, and the deformation behaviour of the extruded body is stuaied by uniaxial tensile test. Effects of grain size and testing temperature cn deformation behaviour are also investigated. The results obtained are as follows:<BR>1) Maximum value of 310% in total elongation of extruded green compact is obtained.<BR>2) The optimum strain rate, at which a maximum total elongation is attained, increases as the grain and the particle size of powder become smaller.<BR>3) As testing temperature increases, flow stress decreases remarkably and total elongation increases rapidly.<BR>4) As in the case of wrought super-plastic materials, there is a good correlation between m value and total elongation of the powder compacts is a little inferior to that of the former.
社団法人粉体粉末冶金協会の論文