标题：Correlation between microstructure and thermal dilation behavior of amorphous Fe-Co-Zr-Mo-W-B alloys
作者：Zhang Ji-teng; Wang Wei-min; Li Gui-hua; Ma Hai-jian; Qin Jing-yu; Bian Xiu-fang
作者机构：[ZHANG Ji-teng] Shandong University, Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Ji'nan, 更多
通讯作者地址：[Wang, WM]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China.
来源：TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
关键词：glass forming ability; viscosity; fragility; Fe-based alloys
摘要：The microstructures and thermal properties of FC(61)Co(9-x)Zr(8)Mo(5)W(x)B(17) (x=0 and 2) formed under different vacuum conditions were investigated by scanning electron microscopy(SEM), X-ray diffractometry(XRD), transmission electron microscopy(TEM), and conventional dilatometry(DIL). The variation of the non-monotonic effects of tungsten content and vacuum conditions on the glass forming ability(GFA) of Fe-based alloys can be drawn in a schematic diagram. The higher the GFA of alloys, the higher the difference between the thermal expansion coefficients of glassy state and crystalline state(Delta alpha), which can be described by the free volume model during dilatometric measurements. Under low and high vacuum conditions, the viscosity and microhardness are improved and the fragility of the Fe-based alloys are decreased by adding tungsten.