【摘要】 依据非晶态合金与其相关相具有相近的电子浓度的规律,对Zr-Al-Ni-Cu系进行了电子浓度e/a=1.38的块状非晶成分的设计和制备.获得的块状非晶具有107 K的大过冷度,表征非晶形成能力(GFA)的Trg值在0.58-0.64之间,最佳成分为Zr60.6Al11.4Ni15.5Cu12.5,其GFA和热稳定性优于Inoue非晶合金.在相同电子浓度下,平均原子尺寸Ra=0.1486nm,其GFA优于Ra为0.1496和0.1506 nm的合金,表明原子尺寸因素对非晶形成能力有重要影响.更多还原

【Abstract】 A new bulk Zr-Al-Ni-Cu amorphous alloy has been designed and prepared according to the rule of constant valence electron concentrations (e/a), which satisfies e/a=1.38. The ΔTX and Trg, characterizing the glass formation ability, reach 107 K and 0.58-0.64, respectively. The best composition of the amorphous alloy is found at Zr60.6Al11.4Ni15.5Cu12.5, which possesses a glass forming ability and a thermal stability superior to those of the Inoue alloy. It is also pointed out that at e/a=1.38, the alloy with average atomic size .Ra=0.1486 nm has a better glass formation ability than those with Ra=0.l496 nm and 0.1506 nm.更多还原