발간논문

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Vol.32, No.7, 888 ~ 896, 1994
Title
Mechanical Alloying Behavior and Room temperature Tensile Properties of Intermetallic Compound Ni3Al
홍순성Soon Sung Hong, 권숙인S . I . Kwun
Abstract
The microstructural evolution and alloying behavior with milling time during mechanical alloying (MA) of elemental powders with nominal composition Ni-17.5Al-8Cr-0.5Zr-0.4B(at%), and the effect of microstructure on the room temperature tensile properties of hot-extruded MA powders were investigated. The powders milled for 360min, which were considered to be in steady state, consisted of Al-supersaturated disordered solid solution with small amount of amorphous phase and α-Al₂O₃ particles produced by decomposition of process control agent during milling. Metallographic examinaton of hot-extruded powders showed very fine grains containing L1₂-type ordered Ni₃Al, disordered phase and finely dispersed oxides. The refined grain size and the oxide dispersoids constributed to the yield strength as high as 1593MPa and the ductility of 8.6%. The results in this study indicate that the mechanical alloying process is suitable for the production of very fine grained intermetallic compounds with very high strength.
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