Mechanical Properties of Nanocrystalline Powder Metallurgy Aluminum Alloys in Glass Forming Al-Ni-Ce-TM (TM : Transition Metal) Systems

概要

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High-strength powder metallurgy (P/M) aluminum alloys were produced through crystallizing amorphous alloys in Al-Ni-Ce-TM (TM : Ti, Mn, Fe, Co, Cu or Zr) systems where the amorphous phase is formed by melt-spinning. Preliminary exploration of optimum alloy compositions were effectively carried out by the measurement of both hardness and maximum bending strain at fracture for the ribbon samples prepared by melt-spinning and then annealing. The addition of Ti or Zr to the glass-forming Al-Ni-Ce alloys causes the increase in mechanical strengths accompanying by the suppression of embrittlement in the annealed state. Al-Ni-Ce-(Ti or Zr) bulk alloys containing more than 89 % Al were produced by extrusion of the rapidly solidified powders prepared by high-pressure helium atomization. The tensile strength and elongation at room temperature for these bulk alloys are in the ranges of 860 to 940 MPa and 3.4 to 1.0 %, respectively. These compacts consist of a mixed structure in which fine Al_3Ni compounds with a particle size below 100 nm are dispersed homogeneously in an fcc-Al matrix with a grain size ranging from 100 to 200 nm.amorphous alloycrystallizationaluminum alloyconsolidationgas atomization
東北大学の論文
1994-03-25