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- W1722357568 abstract "Coexistent icosahedral (I) and fcc-Al phase alloys exhibiting good bending ductility and high tensile strength (σf) were found to form in rapidly solidified Al95.5−xCr3Co1.5Cex (x≤3 at%) and Al94.5−xCr3Co1.5Ce1Mx (M=Ti, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo or Hf) alloys. The particle size and interparticle spacing of the I-phase decrease down to about 40 and 10 nm, respectively, with increasing Ce content, accompanying the increase in the volume fraction of the I-phase. This microstructural change is interpreted to result from the increase in the quenching effect with increasing Ce content. The highest σf value is 1340 MPa for the Al94.5Cr3Co1.5Ce1 alloy and 1330 MPa for the Al93.5Cr3Co1.5Ce1Ti1 alloy. Even after annealing for 900 s at 673 K, the high σf values of 830 and 680 MPa are obtained for the Zr- and Fe-containing penternary alloys, respectively. The high σf values for these alloys are due to the high thermal stability of the I-phase against the grain growth and coalescence. The achievement of the high σf over 600 MPa and the high structural stability allows us to expect that high-strength bulk alloys by utilizing the I-phase as a strengthening medium can be prepared by extrusion at elevated temperatures. Furthermore, it was found from the high resolution TEM and EDX analyses that the Al base I-phase containing 7.2 at%Cr, 1.6%Cr and 2.6%Ce had a disordered structure on a short-range less than 1 nm. This is presumably because of the introduction of a high density of interface between I-phase and phason-induced approximant crystalline phase. The formation of the disordered structure is thought to be the reason for the good ductility which enables the achievement of high σf." @default.
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- W1722357568 date "1995-01-01" @default.
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- W1722357568 title "Microstructure and Mechanical Properties of Rapidly Solidified Al–Cr–Ce–M (M=Transition Metal) Alloys Containing High Volume Fraction of the Icosahedral Phase" @default.
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- W1722357568 doi "https://doi.org/10.2320/matertrans1989.36.6" @default.
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