【摘要】 利用X射线衍射(XRD)及差热分析(DSC)等方法研究了添加B对Zr Ti Cu Ni Be块状非晶合金的形成、结晶及热稳定性的影响·结果表明:在Zr Ti Cu Ni Be合金系中添加B可明显改变该合金的玻璃转变温度Tg,一次结晶温度Tx及过冷液相区ΔT等参数·当y(B)≤3%时,B的添加可使合金保持块状非晶,提高Tg、Tx并扩大过冷液相区,使非晶热稳定性增加;当y(B)≥6%时,B的添加将诱导大量的粗大Zr2Cu及ZrB2等晶体的析出·由于它们非纳米晶,尺寸较大,形状不规整,不能作为非晶复合材料的增强体·更多还原

【Abstract】 ?The effect of B addition on forming, crystallization and thermal stability of Zr-Ti-Ni-Cu-Be amorphous alloys was investigated by X-ray diffraction （XRD）, differential scanning calorimetry （DSC） and optical microscopy. The results indicated that B addition significantly changes the glass transition temperature （T_g）, crystallization temperature （T_x） and supercooled liquid region （ΔT_x） of Zr-Ti-Ni-Cu-Be amorphous alloy. When y（B）≤3at%, B addition can keep it in bulk shape with ΔT_x extended and T_g/T_x increased to improve its thermal stability. When y（B）≥6at%, B addition can induce the precipitation of lots of Zr₂Cu/ZrB₂ coarse crystals which can not reinforce the metallic glass because they are non-nanocrystals in big size and irregular shape.更多还原