Ni基大块非晶合金的玻璃形成能力

Glass-forming ability for Ni-based bulk metallic amorphous alloy

计算已开发的镍基大块非晶合金玻璃形成能力的表征参数Trg、γ、δ、和φ.线性回归表明,这4个参数值与合金的临界直径Dmax之间不存在线性关系,说明它们不能很好地表征镍基非晶合金的GFA.计算镍基大块非晶合金的GFA预测参数λn和ε.结果发现,组元原子尺寸相差不大的镍基非晶合金的λn值大多集中在0.2附近.另外,Dmax与ε之间存在一定的线性关系,说明镍基大块非晶合金的临界直径Dmax与它的ε值成正比.在开发新的镍基非晶合金时,可以参考ε值来确定最佳的合金成分.

The glass-forming ability （GFA） indicators Trg、γ、δ and φ were calculated for Ni-based bulk metallic amorphous alloy developed in the past. By means of linear regression, it was found that the direct proportional relationship between critical diameter Dmax, and each of the four GFA indicators could not be obtained, indicating that the parameters of Trg、γ、δ and φcould not properly reflect the GFA of Ni-based bulk amorphous alloys. Prediction parameters of GFA λn and e were evaluated, also. It was found that the values of λn for most Ni-based bulk metallic glasses, composed of components with similar atomic size were about 0.2. A linear relationship between Dmax and e could be obtained, suggesting that the values of Dmax of Ni-based amorphous alloys were in direct proportion to ε. Thus, the e could be used as a guideline to determine optimal alloy composition for developing new Ni-based bulk metallic glass.