回転電極法を用いたNb_3Al基合金の作製と組織制御 Fabrication and Microstructure Controlling of Nb_3Al Based Alloy by Rotating Electrode Process
In present work, we attempt to produce rapidly solidified powder of a Nb-Al alloy by the Rotating Electrode Process(REP), and successfully obtain good powder whose scatter of aluminun concentration is relatively small. The as-REP powder has a uniformly distributed dendritic structure of the bcc phase stable at high temperatures. The powder was sintered by Hot Pressing at 50MPa and 1873K. It was confirmed by X-ray analysis and electron probe micro analysis(EPMA) that the sintered material has a fine structure consisting of Nb<SUB>3</SUB>Al and Nb solid solution. After heat treated at 1773K for 24h, compression tests were performed in the temperature range from 1273K to 1873K at an initial strain rate of 1.6×10<SUP>-4</SUP>s<SUP>-1</SUP>. Temperature dependence of 0.2% proof stress is found to be similar to that of previous literatures. From the results obtained, we can conclude that this process is very useful to fabricate a Nb<SUB>3</SUB>Al and Nb solid solution in-situ composite with a near net shape.
粉体および粉末冶金 43(2), 256-261, 1996-02-15
Japan Society of Powder and Powder Metallurgy