Abstract
We report the fabrication of the Cu–Ni–Zr–Ti bulk amorphous alloys by warm rolling of amorphous powders, which have been prepared by a high-pressure gas atomization. The Cu 54Ni 6Zr 22Ti 18 amorphous powders obtained by a high-pressure He gas atomization method has a wide supercooled liquid region of 53 K. By warm rolling of amorphous powders in the supercooled liquid state, a fully amorphous Cu 54Ni 6Zr 22Ti 18 alloy is successfully synthesized. The conditions for rolling are obtained from the time–temperature–transformation curve by measuring the time for the onset of crystallization during isothermal annealing in differential scanning calorimetry. The rolled bulk amorphous Cu 54Ni 6Zr 22Ti 18 alloy exhibited high strength about 1.9 GPa, which is against similar to that obtained in the as-cast bulk amorphous alloy.
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