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本文用高压下原位电阻测量法研究了3GPa以下(Fe_(0.1)Co_(0.55)Ni_(0.35))_(78)Si_8B_(14)金属玻璃的晶化温度T_x,并用Kissinger法求得不同压力下金属玻璃的晶化激活能△E_x。测量结果表明,施加压力时这种合金的T_x并不是单调地、更不是线性地升高的,而是在上升的总趋势中还存在某些局部的转折。这和一些被广泛引用的结论是不同的。晶化激活能△E_x也随压力作类似趋势的变化。分析认为,压力促进晶化时的成核过程,而抑制晶核的扩散性长大。两者的综合作用是造成△E_x、从而也构成T_x非单调变化的原因。压力除了通过△E_x影响T_x以外,指数前因子的压力效应也可以使晶化温度产生重要的改变。
In this paper, the crystallization temperature T_x of Fe_ (0.1) Co_ (0.55) Ni_ (0.35)) _ (78) Si_8B_ (14) metallic glass below 3 GPa was investigated by high pressure in situ resistance measurement. Under the crystallization of glass activation energy △ E_x. The measurement results show that the T_x of the alloy does not increase monotonically or linearly when pressure is applied, but there are some local transitions in the general trend of ascent. This is different from some widely cited conclusions. The crystallization activation energy △ E_x also changes with similar trend of pressure. Analysis suggests that pressure promotes nucleation during crystallization and suppresses growth of nuclei. The combined effect of the two is to cause △ E_x, which also constitutes the reason for the non-monotonic change of T_x. In addition to the effect of pressure on T_x through ΔE_x, the pressure effect of exponential factors can also produce important changes in the crystallization temperature.