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《Acta Metallurgica Sinica》 2015-08
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GENG Yaoxiang;HAN Kaiming;WANG Yingmin;QIANG Jianbing;WANG Qing;DONG Chuang;ZHANG Guifeng;TEGUS O;HAüSSLER Peter;Key Lab of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology;School of Materials Science and Engineering, Dalian University of Technology;Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University;Physics Institute, Chemnitz University of Technology;  
The structural and compositional features of amorphous alloys can be described by cluster- plusglue atom model, which is an effective method for the composition design of amorphous alloys. In the Fe-B binary system, Fe2 B phase is an intermetallic phase related to Fe83B17 eutectic point. Under the framework of the highest radial number density and isolation principle, the local structure of Fe2 B phase is characterized by a B-centered Archimedean octahedral antiprism [B- B2Fe8] atomic cluster. Combined with the electron consistence criterion, the[B-B2Fe8]Fe(here the center and shell atoms are separated by a hyphen, a cluster is enclosed in square brackets, the glue atom is out square brackets) is then determined as an ideal cluster formula for Fe-B binary amorphous. To further enhance the glass- forming ability(GFA) of the alloy, the center B and shell Fe atoms in [B- B2Fe8]Fe are replaced with Si and Ta, respectively, due to their large negative enthalpy of mixing between Si-Fe and(B, Si)-Ta atomic pairs, and Fe- B- Si- Ta quaternary composition series, namely [Si- B2Fe8- xTax]Fe, are thus derived. The experimental results reveal that the bulk amorphous alloys with a diameter of 1.0 mm can be achieved for[Si- B2Fe8- xTax]Fe(x=0.4~0.7) compositions. Among them, [Si- B2Fe7.4Ta0.6]Fe(i.e. Fe70B16.67Si8.33Ta5, atomic fraction, %) is the best glass former, its glass transition temperature Tg, supercooled liquid region ΔTxand the reduced glass transition temperatures Trgare 856 K, 33 K and 0.584, respectively. The Vickers hardness, saturation magnetization and coercivity of the [Si-B2Fe7.6Ta0.4]Fe(i.e. Fe71.67B16.67Si8.33Ta3.33) amorphous alloy are measured to be 1117 HV, 1.37 T, and 3.0 A/m, respectively.
【Fund】: 国家自然科学基金项目51131002和51041011;; 中央高校基础研究基金资助项目DUT13ZD102;; 中国工程物理研究院重点发展基金项目2013A0301015;; 国防基础科研项目B1520133007;; 国际热核聚变实验堆计划资助项目2013GB107003资助~~
【CateGory Index】: TG139.8
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