Abstract
The overall composition of Ti40.83Zr40.83Ni18.34 quasicrystal powders that consist of the stable icosahedral phase (I-phase) was prepared by mechanical alloying and the subsequent heat treatment in a vacuum furnace. Then, bulk composite materials (BCMs) with the composition of Ti40.83Zr40.83Ni18.34 I-phase quasicrystal powders and carbonyl nickel powders as metal bonding agent (20wt.%), have been fabricated by high pressure sintering. The Vickers hardness, compressive strength, deformation at fracture, Young's modulus, and wear resistance of the BCMs have been studied in detail, after being sintered at different pressure and temperature. It indicates that high pressure sintering enables us to produce the BCMs (about 10mm in diameter and 3mm in height) with a short sintered time of 10min and high pressure of 3.0GPa. In addition, the optimum sintered condition is 3.0GPa-600°C, which is beneficial of the improvement of the performances of BCM, such as the Vickers hardness of 389, the compressive strength of 430MPa, the deformation at fracture of 2.20%, the Young's modulus of 19GPa, the lowest value of friction coefficient at 0.45±0.13, and wear mass losses of 0.24mm3. This work shows a promise in practical fabrication of BCM that consist of the stable Ti–Zr–Ni icosahedral quasicrystalline phase may be developed.
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