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。
The glass forming ability（GFA） and mechanical properties of Cu Zr-based bulk metallic glasses（BMGs） are extremely sensitive to oxygen and other metalloid impurities in raw materials. In this paper,the excellent glass forming ability of Cu_（45）Zr_（47）Al_8 bulk metallic glass（BMG） with different low-purity material was synthesized by copper mode casting. To study the effect of impurity on glass forming ability and thermal stability of Cu_（45）Zr_（47）Al_8 BMG,the structures of the samples were examined by X-ray diffraction（XRD）,transmission electron microscopy（TEM） and energy dispersive spectrometer（EDS） analysis,and thermodynamic properties were confirmed by differential scanning calorimetry（DSC）. The result showed that the BMG prepared from impure raw material showed a critical diameter greater than 7 mm. In some cases,minor element in the impurity materials could be regarded as alloying element,and proper amount of minor element in the glassy matrix would not lead to the decrease of GFA. However,excessive addition of oxygen and other impurities would lead to the precipitation of crystalline phases and decrease GFA. The alloys made from impure raw material had higher value of Kissinger activation energy and super cooled liquid region ΔTx,and the onset crystallization curves deduced by Kissinger method showed that incubation period of crystallization for the alloy made from impure raw material become longer. It was demonstrated that the alloys using impure metal had stronger thermal stability. Successful formation of Cu Zr-based BMG with impure metal was significant to the development of BMG for commercial productions.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2017年第8期877-883,共7页
Chinese Journal of Rare Metals
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
关键词
CU基非晶合金
低纯材料
玻璃形成能力
热稳定性
Cu-based bulk metallic glass
low-purity material
glass forming ability
thermal stability
