Modification of the Ti₄₀Cu₃₆Zr₁₀Pd₁₄ BMG Crystallization Mechanism with Heating Rates 10-140 K/min

详细信息    查看全文

• 作者：T. Czeppe ; A. Sypien ; A. Wierzbicka-Miernik
• 关键词：bulk metallic glasses ; crystallization ; high heating rates DSC ; kinetic parameters ; phase composition
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：25
• 期：12
• 页码：5289-5301
• 全文大小：4035KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Characterization and Evaluation of Materials; Tribology, Corrosion and Coatings; Quality Control, Reliability, Safety and Risk; Engineering Design;
• 出版者：Springer US
• ISSN：1544-1024
• 卷排序：25

文摘

The article presents investigations of Ti₄₀Cu₃₆Zr₁₀Pd₁₄ bulk metallic glass crystallization process heated with the rates of 10, 60, 100 and 140 K/min. High heating rates experiments were performed in a new type of differential scanning calorimeter equipped with a fast responding thermal sensor. Phase composition and microstructure were studied with x-ray diffraction and transmission electron microscopy. The observed crystallization proceeded in two separate steps. Applied high rates of heating/cooling resulted in the crystallization of only one CuTi phase, replacing typical multi-phase crystallization. The microstructure after crystallization was polycrystalline with some amount of amorphous phase retained. Kinetic parameters were determined with the use of the Kissinger and Friedman iso-conversional analysis and Matusita–Sakka iso-kinetic model. The kinetic analysis supplies results concerning autocatalytically activated mechanism of primary crystallization with decreasing activation energy and small density of quenched-in nuclei, in good agreement with previous structural investigations. The mechanism of secondary crystallization required dense nuclei site, increasing activation energy and large nucleation frequency. The amorphous phase of Ti₄₀Cu₃₆Zr₁₀Pd₁₄ BMG revealed high thermal stability against crystallization. Application of high heating rates in DSC experiments might be useful for the determination of mechanism and kinetic parameters in investigations of metallic glasses crystallization, giving reasonable results.