Sintering Process and Mechanical Properties of High-Si-Al Alloy Powder by Spark Plasma Sintering.

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  • 放電プラズマ焼結法による高Ｓｉ‐Ａｌ粉末の焼結過程と機械的性質
  • ホウデン プラズマ ショウケツホウ ニヨル コウ Si-Al フンマツ ノ シ

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Abstract

Spark plasma sintering (SPS) method has been applied for the consolidation and sintering of argon gas atomized powder of Al-25mass%Si-3.5%Fe-3.5%Ni-1%Mg alloy. Through this experiments, firstly, we investigated the sintering process of SPS method for Al alloy powder by means of optical microscopy, scanning electron microscopy and X-ray diffraction. Secondly, we investigated the mechanical properties of near-net-shape formed AI alloy powder by SPS method. Results obtained were as follows:<BR>(1) At the sintering process of SPS, the sample temperature rose faster and it was kept 10 K higher than the temperature of die. After shut off the electric power, sample temperature goes down faster than that of die.<BR>(2) At the very early step of SPS process, each particle of Al alloy gather to dense by slipping and deformation. When sample temperature is up to 650-660 K, necking of particles is formed.<BR>(3) Tensile strength of SPSed compacts is 235 N/mm2, however, this value is increased up to 285 N/mm2 by heat treatment.

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