Real time synchrotron radiation studies on metallic glass (Zr_0.55Al_0.1Ni_0.05Cu_0.3)₉₉Y₁ after cold rolling

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• 作者：Yan Li ; Konstantinos Georgarakis ; Shujie Pang ; Chaoli Ma ; Gavin Vaughan ; Alain Reza Yavari ; Tao Zhang
• 关键词：A. Bulk metallic glass ; D. Defects ; free volume ; B. Crystallization ; B. Metastable phases ; Diffraction
• 刊名：Intermetallics
• 出版年：2009
• 出版时间：April 2009
• 年：2009
• 卷：17
• 期：4
• 页码：231-234
• 全文大小：436 K

文摘

(Zr_0.55Al_0.1Ni_0.05Cu_0.3)₉₉Y₁ bulk metallic glasses heavily deformed by cold rolling were studied by X-ray diffraction (XRD) in transmission using high energy monochromatic synchrotron radiation during in situ heat treatment. No crystalline grain was detected in the cold-rolled samples. After deformation, excess free volume, ΔV_f, was measured by X-ray diffraction. In situ heating XRD results revealed that metastable crystalline phase was nucleated and grew before the formation of equilibrium CuZr₂. Further investigation showed that the metastable phase is Zr₃Al₂-type crystalline structure which is the primary crystalline phase that appears in several Zr-based metallic glasses during the thermal treatment [Plappert R, Boström M, Kühn U, Vaughan G, Yavari AR, Kvick Å. ISMANAM, Paris; 2005].