| 引用本文: | 蒋东阳,吴念初,连景宝,王蕤,杨雪峰.Ni和Y影响Al-Ni-Y金属玻璃形成能力的本征机理[J].材料科学与工艺,2018,26(4):1-7.DOI:10.11951/j.issn.1005-0299.20170362. |
| JIANG Dongyang,WU Nianchu,LIAN Jingbao,WANG Rui,YANG Xuefeng.Nature of Ni and Y effect on the glass forming ability in the Al-Ni-Y ternary metallic glasses[J].Materials Science and Technology,2018,26(4):1-7.DOI:10.11951/j.issn.1005-0299.20170362. |
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| 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.
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| 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 |
| DOI：10.11951/j.issn.1005-0299.20170362 |
| 分类号:TG139+.8 |
| 文献标识码:A |
| 基金项目: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). |
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| Nature of Ni and Y effect on the glass forming ability in the Al-Ni-Y ternary metallic glasses |
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JIANG Dongyang1, WU Nianchu1,2, LIAN Jingbao1, WANG Rui1, YANG Xuefeng1
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(1.School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China; 2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
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| Abstract: |
| 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 (2KF); 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-2KF| criterion was proposed to evaluate the GFA of Al-Ni-Y ternary alloy. This criterion was confirmed by the experimental results.
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| Key words: Al-based metallic glasses glass forming ability electronic structure pseudo-Brillouin zone fermi sphere |
