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Effect of Ni addition on glass forming ability and thermal stability of Nd-Fe-Al-Ni bulk metallic glasses

机译：镍添加对Nd-Fe-Al-Ni块状金属玻璃的玻璃形成能力和热稳定性的影响

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摘要

(Nd60Fe30Al10)100-xNix (where x = 0, 3, 5, 8 and 10 at%) alloy cylinders with a diameter of 3 mm and a length of 55 mm were prepared by copper mold casting. The effect of Ni addition on glass forming ability (GFA) and thermal stability of Nd-based alloy was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). It was found that a bulk metallic glass (BMG) composite with a small amount of primary crystallites in the amorphous matrix is formed without Ni addition, and the proportion of crystallites decreases with an increase in the amount of Ni. The (Nd60Fe30Al10)92Ni8 alloy exhibits the best GFA even though there is no apparent glass transition and supercooled liquid region. It is interesting to note that the main melting temperature of the (Nd60Fe30Al10)92Ni8 alloy is lower than its crystallization temperature, resulting in the value of the nominal reduced crystallization temperature Tr (=Tx/Tm) being larger than 1.0. The separation of amorphous phases with different thermal stabilities is believed to be one of the reasons for the anomalous phenomenon. The high GFA of the alloy may be explained in terms of valence concentration and structural stability of the amorphous phase.
机译：通过铜铸模制备直径为3mm，长度为55mm的（Nd60Fe30Al10）100-xNix（其中x ＝ 0、3、5、8和10at％）合金圆柱体。使用X射线衍射（XRD），扫描电子显微镜（SEM）和差示扫描量热法（DSC）研究了添加Ni对Nd基合金的玻璃形成能力（GFA）和热稳定性的影响。发现在不添加Ni的情况下形成了在非晶基质中具有少量初级微晶的块状金属玻璃（BMG）复合物，并且微晶的比例随着Ni的量的增加而降低。即使没有明显的玻璃化转变和过冷液体区域，（Nd60Fe30Al10）92Ni8合金也表现出最佳的GFA。有趣的是，（Nd60Fe30Al10）92Ni8合金的主要熔化温度低于其结晶温度，导致标称还原结晶温度Tr（= Tx / Tm）的值大于1.0。具有不同热稳定性的非晶相的分离被认为是产生异常现象的原因之一。可以根据价态浓度和非晶相的结构稳定性来解释合金的高GFA。

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    Hu Y; Liu L; Chan KC; Yang YZ;

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  • 年度 2006
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  • 正文语种 eng
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