低纯材料制备Cu-Zr基非晶合金

发布时间：2018-04-15 11:27

本文选题：Cu基非晶合金 + 低纯材料　；参考：《稀有金属》2017年08期

【摘要】：Cu-Zr基非晶合金的玻璃形成能力与原材料中的氧和其他非金属杂质非常敏感。采用低纯材料通过铜模吸铸法制备Cu45Zr47Al8非晶合金,研究杂质对Cu-Zr基非晶合金玻璃形成能力和热稳定性的影响。用X射线衍射(XRD),透射电子显微镜(TEM)和能谱仪(EDS)分析合金组织结构及差示扫描量热法(DSC)分析合金的热稳定性。实验结果表明:低纯材料制备出临界直径7 mm以上的非晶合金。由于低纯材料中的一些微量杂质元素被认为合金化元素,适量的杂质元素没有导致合金的玻璃形成能力降低;而过量的氧和其他杂质元素导致非均匀形核并随之发生结晶,合金的玻璃形成能力明显地降低。低纯材料制备的合金的ΔTx和晶化激活能均高于高纯原料制备的;并基于Kissinger方法所构建的开始晶化曲线表明低纯材料制备的合金的晶化孕育期更长,说明低纯材料制备的合金具有更强的热稳定性。低纯材料成功制备出大块Cu-Zr基非晶合金,为促进非晶合金的商业应用有重要意义。
[Abstract]:The glass forming ability of Cu-Zr-based amorphous alloys is sensitive to oxygen and other non-metallic impurities in raw materials.The glass forming ability and thermal stability of Cu45Zr47Al8 amorphous alloy based on Cu-Zr were investigated by using low purity material by copper mould suction casting method to study the influence of impurity on glass forming ability and thermal stability of Cu-Zr based amorphous alloy.The microstructure and thermal stability of the alloy were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The thermal stability of the alloy was analyzed by differential scanning calorimetry (DSC).The experimental results show that amorphous alloys with critical diameter of more than 7 mm have been prepared from low purity materials.Because some trace impurity elements in low purity materials are considered alloying elements, the proper amount of impurity elements do not decrease the glass-forming ability of the alloy, while excessive oxygen and other impurity elements lead to heterogeneous nucleation and subsequent crystallization.The glass-forming ability of the alloy is obviously reduced.The 螖 Tx and crystallization activation energies of the alloys prepared with low purity materials were higher than those prepared from high purity materials, and the initial crystallization curves based on the Kissinger method showed that the crystallization incubation period of the alloys prepared with low purity materials was longer than that of the alloys prepared with high purity materials.The results show that the alloy prepared with low purity material has stronger thermal stability.Bulk Cu-Zr based amorphous alloys were successfully prepared from low purity materials, which is of great significance in promoting the commercial application of amorphous alloys.
【作者单位】：西安工业大学材料与化工学院;
【基金】：陕西省教育厅专项(14JK1351) 西安工业大学校长基金项目(0852-302021407)资助
【分类号】：TG139.8

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