Structural evaluation in Zr 15 Al 5 Ni 57 Y 23 bulk metallic glass under high pressure
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1048-Z05-10
Structural evaluation in Zr15Al5Ni57Y23bulk metallic glass under high pressure Gong Li1, Yunpeng Gao2, Tao Xu2, Qin Jing2, Jing Liu3, and Riping Liu2 1 Key Lab of Metastable Materials Mater Science &Technology, Yanshan University, 438,Hebei Avenue, Qinhuangdao, 066004, China, People's Republic of 2 Yanshan University, Qinhuangdao, 066004, China, People's Republic of 3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100039, China, People's Republic of ABSTRACT The compression behavior of Zr15Al5Ni57Y23 bulk metallic glass is investigated at room temperature using in-situ high pressure energy dispersive X-ray diffraction with a synchrotron radiation source. The structural information of the atomic configuration about Zr15Al5Ni57Y23 bulk amorphous alloy such as coordination number, neighbor atomic distance is gained by Fourier transformation under different pressure. The investigation shows that the structure of Zr15Al5Ni57Y23 bulk metallic glass is stable under the pressure ranging from 0 to 31.7 GPa, but the degree of short-range order changes by the pressure altering the second and the third nearest neighbor local atomic configuration of the amorphous alloy. INTRODUCTION Bulk metallic glasses (BMGs) have excellent glass forming ability and possess special mechanical and physical properties, which closely relate with their unique micro-structural configuration [1, 2]. The structural investigation of amorphous alloys shows that metallic glass is of close-packed structure [3], which is always closely linked to atomic configuration of metallic components. The structural evaluation of BMGs contains a series of continuous change on the atomic level which is linked to the atomic short range ordering (SRO) or middle range ordering (MRO) [4, 5]. High pressure has significant effect on the chemical and physical properties of matter. Thereby it is very important in practice and theory to investigate structure of the amorphous alloys under high pressure [6]. The investigation of compression properties in amorphous alloys in the past indicated that the glassy property remained unaltered at high pressure, but it did not provide the information about atomic short range ordering changes under pressures[7,8]. Energy dispersion x-ray diffraction (EDXRD) is one of the simplest and most effective ways to investigate the amorphous structure. We can gain radial distribution function (RDF) by diffraction data of the material under high pressure, so the change of the amorphous structure can be analyzed on the atomic level. In this paper, we investigate the compression behavior of Zr15Al5Ni57Y23 bulk metallic glass at room temperature under high pressure using EDXRD with a synchrotron radiation source, and the change of amorphous structure and atomic configuration are discussed.
EXPERIMENTAL DETAILS Zr15Al5Ni57Y23 BMG was produced by suction of the melt into a copper mold. The amorphous nature as well as the homogeneity of the Zr15Al5Ni57Y23 BMG was ascertained by x-ray diffraction. The in-situ high-pr
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