Effect of short-range order in liquid on the glass forming ability of Fe–Si–B alloy wires
Effect of short-range order in liquid on the glass forming ability of Fe–Si–B alloy wires
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DOI：
10.1016/j.matlet.2003.08.024
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发表时间：
2004-02
影响因子：
3
通讯作者：
H. Ko;J. Y. Chang
中科院分区：
文献类型：
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作者：
H. Ko;J. Y. Chang
研究了液相短程有序（SRO）对Fe 100 −（x+y）SixBy（2.5≤x≤22.5，2.5≤y≤25，10≤x+y≤35）合金丝非晶形成能力（GFA）的影响。我们考虑了液相可以用SRO表示的热力学条件，并介绍了一种估算液相中SRO程度的新方法。对Fe-Si-B合金丝的非晶形成进行了实验研究，并与热力学方法的结果进行了比较，明确了液态SRO与Fe-Si-B合金非晶形成之间的关系。结果表明，用ΔHmix+ RT表示的液相SRO不是非晶相形成的充分条件，而是必要条件。在液相中，随着SRO的增加，合金的非晶形成区逐渐增大，达到最大值后，非晶形成区逐渐减小。当SRO程度很大时，不能得到非晶丝。据信，合金丝的GFA取决于液体中给定程度的SRO是倾向于玻璃化还是转变成晶体。
The effect of short-range order (SRO) in liquid on the glass forming ability (GFA) has been investigated in Fe100−(x+y)SixBy(2.5≤x≤22.5, 2.5≤y≤25, 10≤x+y≤35) alloy wires. We have considered a thermodynamic condition in which a liquid phase can be stated in terms of SRO and introduced a new approach to estimate the degree of SRO in liquid. Experimental investigations into the GFA of the Fe–Si–B alloy wires were preformed and compared with the results of thermodynamic approach to make the relationship between the SRO in liquid and the GFA of the Fe–Si–B alloy clear. It is demonstrated that SRO in liquid represented in terms of ΔHmix+RTmis not the enough condition but necessary one for the formation of an amorphous phase. The GFA of the alloy increased with the increasing SRO in liquid, then decreased with that after showing a maximum. Amorphous wires could not be obtained when the degree of SRO was very large. It is believed that the GFA of the alloy wires depends on whether the given degree of SRO in liquid prefers vitrification or transformation into a crystal.