利用电弧炉制备一系列(Zr_(51.6)Cu_(48.4))_(100-x)Al_x(x=6.0～10.0, 摩尔分数,%)大块非晶合金,利用示差扫描量热仪、X射线衍射仪和金相显微镜研究Al的含量对其非晶形成能力的影响.结果表明:当铝的含量为9.0%时,合金具有最优的非晶形成能力.适量铝的加入不仅能够抑制初生相CuZr的析出,而且还能有效地抑制其长大.临界冷却速率的经验公式计算结果显示该合金的临界冷却速率为10 K/s,室温压缩力学性能显示其断裂强度为1.9 GPa,且有0.5%的塑性变形,式为韧性剪切断裂.
Bulk metallic glasses (BMG) (Zr_(51.6)Cu_(48.4))_(100-x)Al_x(x=6-10, molar fraction, %) were prepared by copper mould casting. The effect of Al content on the glass-forming ability (GFA) of ZrCu based metallic glass alloys was investigated by differential scanning calorimetry, X-ray diffractometry, and optical microscopy. The results show that when the Al content is 9.0%, the alloy has the optimal GFA. Proper Al additions can suppress the precipitation and the growth of the primary CuZr phase. The critical cooling rate of the Zr_(47)Cu_(44)Al_9 alloy is about 10 K/s. The compression strength is about 1.9 GPa and the elongation is about 0.5%. The surface morphology of fracture shows a clear vein pattern.
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