Abstract
Abstract The investigations of the phase constitutes and microstructure were performed on as-cast (Ti 40 Zr 25 Ni 8 Cu 9 Be 18 ) 100− x Nb x ( x = 0, 3, 5, 8, 10) (O 3) glass forming alloys. Large quantities of icosahedral quasicrystals are found to distribute in the glassy matrix of alloys with Nb content 3 and 5 at.%, fully amorphous phase with 8 at.% Nb, and a few nanocrystals corresponding to a CuTi-phase precipitating in the glassy matrix with 10 at.% Nb. In addition, 8 at.% Nb-containing alloy exhibits relatively good glass forming ability as well as Nb-free alloy. The activation energy for the first crystallization of this alloy is 249.80 kJ/mol, larger than that of the Nb-free alloy; moreover, this alloy possesses higher room temperature compressive fracture strength (2083 MPa), although it exhibits smaller plasticity (2.1%) than that of Nb-free alloy.
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