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本文通过使用不同纯度的原材料Ce制备Ce70GaxCu70-x(4≤x≤15)系大块非晶合金,系统研究了原材料纯度对合金玻璃形成能力(GFA)的影响.结果发现,相同的合金成分,Ce的纯度变化0.1%左右,能够引起非晶合金临界尺寸从1 mm到6–10 mm的变化.同时,Ce70GaxCu70-x(4≤x≤15)系的临界玻璃形成尺寸和Ga含量x之间的关系也随着Ce元素纯度的变化而显著变化.总体来看,与其他的Fe基和Zr基体系不同,低纯度的原材料有助于提高Ce-Ga-Cu系非晶合金的玻璃形成能力.本文还分析了合金的GFA和热力学参数之间的关系,发现晶化温度(Tx)越高,形成能力越好,这表明Ce基合金的形成能力与其抵抗晶化的能力密切相关.此外,实验结果也显示原材料杂质中的微量元素,能有效抑制Ce和CeCuGa3相的形成,从而导致合金GFA的提高.因此,本文结果有助于深入理解微量元素对玻璃形成能力的影响以及作用机制.
In this paper, Ce70GaxCu70-x (4≤x≤15) bulk amorphous alloy was prepared by using Ce with different purity, and the effect of purity of raw materials on the glass forming ability (GFA) of the alloy was systematically investigated. It was found that the same alloy composition, The change of the purity of Ce is about 0.1%, which can cause the change of the critical size of the amorphous alloy from 1 mm to 6-10 mm. Meanwhile, between the critical glass size of Ce70GaxCu70-x (4≤x≤15) and Ga content x Also changes significantly with the purity of Ce element.In general, low purity raw materials contribute to improving the glass forming ability of Ce-Ga-Cu amorphous alloys, in contrast to other Fe-based and Zr-based systems The relationship between the GFA and the thermodynamic parameters of the alloy is also analyzed.The higher the crystallization temperature (Tx), the better the formation ability, which indicates that the formation ability of Ce-based alloy is closely related to its resistance to crystallization.Furthermore, The experimental results also show that trace elements in the impurities of raw materials can effectively restrain the formation of Ce and CeCuGa3 phases and lead to the increase of the GFA of the alloy.Therefore, the results of this paper are helpful to understand the influence of trace elements on the glass forming ability and its mechanism.