발간논문

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Vol.37, No.11, 1363 ~ 1370, 1999
Title
Research Paper / Powder Metallurgy : A Study on the Consolidation Behavior of Nanocrystalline Al-Ti Alloy Powders by Plasma Activated Sintering Process
류종렬Jong Ryol Ryu,문경일Kyoung Il Moon,이경섭Kyung Sub Lee
Abstract
Nanocrystalline Al-Ti alloy powders were produced by the reactive ball milling and subsequently consolidated by the plasma activated sintering(PAS). The consolidation behavior of the powder with pressure, temperature and time was investigated by densimeter, SEM and TEM. Al-Al₃Ti alloy powders were produced after degassing treatment at 500℃ and these alloy powders maintained the grain sizes of about 20㎚ nearly equal to those of the as-milled powders. Nanocrystalline Al-Al_3Ti alloy powders were fully consolidated to the relative density of about 99% and the grain sizes maintained to the order of 50∼100㎚ under the condition of 75MPa, 500℃ and 60s which is considered to be the optimum consolidation condition of PAS process. TEM analysis of PAS consolidated Al-Al_3Ti alloys showed more uniform and finer grain sizes in very short consolidation times than the Al-Ti alloys consolidated by conventional vacuum hot pressing and hot extrusion.
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