Ti-Zr-Ni单相准晶合金的室温力学性能研究

以Ti40₄₀Zr40₄₀Ni20₂₀合金为研究对象，用铜 模吸铸法制备出直径为3mm的致密单相准晶棒，通过维氏显微硬度测定和单向压缩实验方 法研究了该合金的室温力学性能 .结果表明：Ti40₄₀Zr40₄₀Ni20₂₀准晶具有良好 的弹性变形能力，室温弹性应 变可达125%.同时，它具有相对高的室温硬度（约55GPa），是普通Ti合金的15倍.T i40_{40关键词：准晶Ti-Zr-Ni合金解理断裂}

Mechanical properties of the single-phase Ti-Zr-Ni quasicrystalline alloy at roo m-temperature

At the composition of Ti40₄₀Zr40₄₀Ni20₂₀ , a single_phase cylindr ical quasicrystalline alloy, 3mm in diameter and 15mm in length, can be fabr icated by a copper-mold casting method. Its quasicrystalline nature and structu ral homogeneity were confirmed by x_ray diffraction and transmission electron mi croscopy. According to compression and indentation tests at room_temperature, th e as_cast Ti40₄₀Zr40₄₀Ni20₂₀ quasicry stalline rod has a hardness of 55GPa and a fracture strength of 542MPa. In particular, the Young's modulus (～43GPa) of Ti40₄Zr40₄₀ Ni20₂₀ quasicrystals is consid erably low while they possess a high Poisson's ratio (～048). Under monax ial compression, the Ti40₄₀Zr40₄₀Ni20₂₀ quasicrystalline alloy e xhibits a highly elastic deformation capability of 125%. The cleavage fracture morphologies indicate a brittle fracture mechanism.