How Can Synchrotron Radiation Techniques Be Applied for Detecting Microstructures in Amorphous Alloys?

Metals

Gu-Qing Guo²  Shi-Yang Wu²  Sheng Luo²  Liang Yang¹ 

[1] College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

关键词: metallic glasses;    extended X-ray absorption fine structure;    X-ray diffraction;    reverse Monte Carlo simulation;    microstructure;   

DOI  :  10.3390/met5042048

来源: mdpi

【 摘 要 】

In this work, how synchrotron radiation techniques can be applied for detecting the microstructure in metallic glass (MG) is studied. The unit cells are the basic structural units in crystals, though it has been suggested that the co-existence of various clusters may be the universal structural feature in MG. Therefore, it is a challenge to detect microstructures of MG even at the short-range scale by directly using synchrotron radiation techniques, such as X-ray diffraction and X-ray absorption methods. Here, a feasible scheme is developed where some state-of-the-art synchrotron radiation-based experiments can be combined with simulations to investigate the microstructure in MG. By studying a typical MG composition (Zr₇₀Pd₃₀), it is found that various clusters do co-exist in its microstructure, and icosahedral-like clusters are the popular structural units. This is the structural origin where there is precipitation of an icosahedral quasicrystalline phase prior to phase transformation from glass to crystal when heating Zr₇₀Pd₃₀ MG.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.