발간논문

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Vol.29, No.9, 983 ~ 991, 1991
Title
On the High temperature Properties of Hot Consolidated Compact
이광민Kwang Min Lee, 문인형In Hyung Moon
Abstract
The microstucture and mechanical properties of mechanically alloyed Al-Ti alloys were investigated in order to evaluate the relation between the role of dispersoids and their high temperature properties. The MA Al-Ti specimens with the density above 98 % of theoretical one were obtained by hot consolidation i. e., hot pressing or extrusion. The MA Al-Ti alloys have shown the excellent elevated tensile strength up to 350℃ and good thermal stability at 460℃ even after annealing of 100 hours. TEM analysis has revealed the presence of Al₃Ti aluminides with the size of 50-300㎚. The dispersoids of Al_4C₃ carbide and Al₂O₃ oxide were also found in the aluminum matrix. The effects of dispersoid and grain size on the strengthening mechanisms seem to be dominant for the high temperature properties of MA Al-Ti alloys.
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