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 Sintering Process and Mechanical Properties of High-Si-Al Alloy Powder by Spark Plasma Sintering
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/mm<SUP>2</SUP>, however, this value is increased up to 285 N/mm<SUP>2</SUP> by heat treatment.
粉体および粉末冶金 44(10), 945-950, 1997-10-15
Japan Society of Powder and Powder Metallurgy