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Powder metallurgy (P/M) alloys of AVFT(Al-6.4%V-4.2%Fe-1.7%Ti)-26P/M, AVFT-75P/M, AVFT-125P/M, AVCF(Al-2.9%V-3.8%Cr-4.3%Fe)-26P/M, AVCF-125P/M, AVFS(Al-6.5%V-3.6%Fe-1.6%Si)-125P/M and AVN(Al-6.7%V-4.1%Ni)-125P/M were prepared by extruding gas atomized powders with the sizes smaller than 26μm, 75μm or 125μm at 673 K. The constituent structure was Q.C. (quasicrystalline)+fcc-Al(Al)+Al11V+Al13Fe4+Al23Ti9 for the AVFT-P/M alloy, Q.C.+A1 for the AVCF-P/M alloy, Q.C.+Al+Al11V+Al13Fe4 for the AVFS-P/M alloy and Q.C.+Al+Al11V+Al3Ni for the AVN-P/M alloy. The quasicrystalline particles in the P/M alloys have an icosahedral structure and their particle size is about 500 nm. The ultimate tensile strength (σUTS), plastic elongation (eP), Young's modulus (E) and Vickers hardness (Hv) of the P/M alloys are in the range of 430 to 570 MPa, 3.3 to 7.3%, 80 to 91 GPa and 150 to 192, respectively, at room temperature. The ours, 0.2% proof strength (σ0.2) and ep at 573 K are 191 to 316 MPa, 171 to 298 MPa and 5.2 to 23.4 %, respectively. The wear rate of the AVFS-125P/M alloy decreases with increasing the sliding velocity (Vs) from 3.5×10-7 mm2/kg at Vs=0.5 m/s to 2.6×10-7 mm2/kg at Vs=2.0 m/s.

Microstructure and elevated-temperature strength of P/M Al-V-Fe-M(M=Ti,Cr or Si) alloys containing quasicrystalline phase.