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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Kinetics and formation mechanism of amorphous Fe52Nb48 alloy powder fabricated by mechanical alloying
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Kinetics and formation mechanism of amorphous Fe52Nb48 alloy powder fabricated by mechanical alloying

机译：机械合金化制备非晶态Fe52Nb48合金粉末的动力学和形成机理

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摘要

A single phase amorphous Fe52Nb48 alloy has beensynthesized through a solid state interdiffusion of purepolycrystalline Fe and Nb powders at room temperature, using ahigh-energy ball-milling technique. The mechanisms of metallicglass formation and competing crystallization processes in themechanically deformed composite powders have been investigatedby means of X-ray diffraction, M6ssbauer spectroscopy,differential thermal analysis, scanning electron microscopy andtransmission electron microscopy. The numerous intimate layeredcomposite particles of the diffusion couples that formed during thefirst and intermediate stages of milling time (0-56 ks), areintermixed to form amorphous phase(s) upon heating to about 625K by so-called thermally assisted solid state amorphization,TASSA. The amorphization heat of formation for binary systemvia the TASSA, ΔHa was measured directly as a function of themilling time. Comparable with the TASSA, homogeneousamorphous alloys were fabricated directly without heating thecomposite multilayered particles upon milling these particles forlonger milling time (86 ks-144 ks). The amorphization reactionhere is attributed to the mechanical driven solid stateamorphization. This single amorphous phase transforms into anorder phase (μ phase) upon heating at 1088 K (crystallizationtemperature, Tx) with enthalpy change of crystallization, ΔHa, of -8.3 kJ mol-1.
机译：通过使用高能球磨技术在室温下通过纯多晶Fe和Nb粉末的固相互扩散合成了单相非晶态Fe52Nb48合金。通过X射线衍射，M6ssbauer光谱，差热分析，扫描电子显微镜和透射电子显微镜研究了机械变形复合粉末中金属玻璃的形成和竞争结晶过程。在铣削时间的第一阶段和中间阶段（0-56 ks）形成的扩散对的大量紧密的层状复合颗粒，通过所谓的热辅助固态非晶化（TASSA）加热至约625K，相互混合形成非晶相。通过TASSA直接测量二元体系的非晶化形成热ΔHa作为研磨时间的函数。与TASSA相比，无需研磨复合多层颗粒即可直接制备均质非晶态合金，而将这些颗粒研磨更长的研磨时间（86 ks-144 ks）。这里的非晶化反应归因于机械驱动的固态非晶化。当在1088 K（结晶温度，Tx）下加热时，该单一非晶相转变为无序相（μ相），其结晶焓变ΔHa为-8.3 kJ mol-1。

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