Structural fragility and Curie-Weiss behavior distinguishing glass forming ability in Ti-based metallic alloys

IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
N.A. Mauro , K.F. Kelton
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Abstract

The results of synchrotron x-ray scattering studies of glass forming Ti40Zr10Cu36Pd14 and Ti34Zr11Cu47Ni8 (Vit101) liquids and glasses are presented. Containerless experiments on the liquids were made using electrostatic levitation, while the corresponding glasses were thermally cycled to measure and account for structural relaxation. The total structure factor and total pair-distribution functions were measured as a function of temperature for the two equilibrium and supercooled Ti-based liquids, and for the corresponding glasses from room temperature to their respective glass transition temperatures. The rate of structural ordering was determined from the rate of increase in the magnitude of the first peak in the X-ray structure factors with decreasing temperature. Structural fragility is observed in these systems, with the magnitude of the fragility factor inversely correlated with the glass forming-ability. The amplitude of the first peak in the x-ray static structure factor in both alloys displays evidence for a Curie-Weiss type behavior. A proposed order parameter distinguishing glass-forming ability, (S(T,q1)1)1, shows a peak in the effective Curie temperature. This peak is at a higher temperature for the better glass former, consistent with a liquid that is closer to the ideal glass structure at a higher temperature.

Abstract Image

Abstract Image

ti基金属合金的结构脆性和居里-魏斯行为区分玻璃形成能力
本文介绍了同步x射线散射对Ti40Zr10Cu36Pd14和Ti34Zr11Cu47Ni8 (Vit101)液体和玻璃形成的研究结果。使用静电悬浮对液体进行无容器实验,同时对相应的玻璃进行热循环以测量和解释结构松弛。测量了两种平衡态和过冷态钛基液体的总结构因子和总配对分布函数,以及相应玻璃从室温到各自玻璃化温度的函数。根据x射线结构因子中第一峰的大小随温度的降低而增加的速率来确定结构的有序率。在这些体系中观察到结构脆性,脆性因子的大小与玻璃形成能力成反比。两种合金的x射线静态结构因子的第一个峰的振幅显示出居里-魏斯型行为的证据。本文提出的区分玻璃形成能力的序参量(S(T,q1)−1)−1(S(T,q1)−1)−1在有效居里温度上有一个峰值。对于更好的玻璃前体,这个峰值在更高的温度下,与更高温度下更接近理想玻璃结构的液体一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Materialia
Acta Materialia 工程技术-材料科学:综合
CiteScore
16.10
自引率
8.50%
发文量
801
审稿时长
53 days
期刊介绍: Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.
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