摘要
为了揭示Ni和Y元素对Al-Ni-Y三元金属玻璃的玻璃形成能力影响的本征机理,且基于费米面和伪布里渊区理论,提出了Ni和Y元素对Al-Ni-Y三元金属玻璃的玻璃形成能力的影响分为两种情况:Ni原子通过Al和Ni原子之间的电子轨道杂化效应,改变费米面直径(2KF),从而影响Al基金属玻璃的玻璃形成能力;Y原子通过整体原子的静态结构,改变伪布里渊区(KP),最终影响Al基金属玻璃的玻璃形成能力.费米面和伪布里渊区尺寸通过电子能量损失谱(EELS)、X射线衍射(XRD)和X射线光电子能谱(XPS)获得.研究表明,当两者相互作用机制满足2KF=KP,条件时,费米能级处电子态密度最低,金属玻璃整体结构的稳定性达到最佳.在此基础上,提出了δ=KP-2KF判据用于衡量Al-Ni-Y三元金属玻璃的玻璃形成能力,该判据在实验上得到验证.
In order to reveal the effect of Ni and Y on the glass forming ability（GFA） of Al-Ni-Y ternary alloy system,two conclusions are drawn based on the Fermi sphere-Brillouin zone interaction and spectroscopy experiments： firste the effect of Ni is influenced by the electron hybridization between Al atom and Ni atom,changing the diameter of the Fermi sphere（2 KF）; second the effect of Y element mainly changes the diameter of the pseudo-Brillouin zone（KP）. Their effects on the Fermi level and Brillouin zone size were obtained by the EELS（electron energy-loss spectra）, XPS（x-ray photoelectron spectroscopy） and XRD（x-ray diffraction）. Research results showed that the static structure changes of Al atoms and Y atoms influenced the diameter of the pseudo-Brillouin zone. The best GFA could be obtained when the Fermi surfaces nearly touched the quasi-Brillouin boundaries. On this basis,the δ = KP-2 KFcriterion was proposed to evaluate the GFA of Al-Ni-Y ternary alloy. This criterion was confirmed by the experimental results.
作者
蒋东阳
吴念初
连景宝
王蕤
杨雪峰
JIANG Dongyang;WU Nianchu;LIAN Jingbao;WANG Rui;YANG Xuefeng(School of Mechanical Engineering,Liaoning Shihua University,Fushun 113001,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2018年第4期1-7,共7页
Materials Science and Technology
基金
国家自然科学基金(51701090)
辽宁省博士启动基金(201601332)
辽宁石油化工大学国家级科研项目培育基金(2016PY-023)
辽宁石油化工大学科研启动基金(2016XJJ-043)
辽宁省教育厅青年项目(L2017LQN025)
关键词
Al基金属玻璃
玻璃形成能力
电子结构
伪布里渊区
费米面
Al-based metallic glasses
glass forming ability
electronic structure
pseudo-Brillouin zone
fermi sphere
