Elastic Properties of Pd-Based Bulk Metallic Glasses Studied by Ultrasound Spectroscopy

被引：10
|
作者：
Tarumi, Ryuichi [1 ]
Hayama, Noritaka [1 ]
Hirao, Masahiko [1 ]
Higo, Yakichi [2 ]
Kimura, Hisamichi [3 ]
Inoue, Akihisa [3 ]
机构：
[1] Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan
[2] Tokyo Inst Technol, Precis & Intelligence Lab, Yokohama, Kanagawa 2268503, Japan
[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2008年 / 47卷 / 05期
关键词：
Pd-based bulk metallic glasses; elastic constants; electromagnetic acoustic resonance; Blackman diagram; Einstein temperature;
D O I：
10.1143/JJAP.47.3807
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigated elastic constants C(ij) of Pd(78)Cu(6)Si(16) and Pd(42.5)Cu(30)Ni(7.5)P(20) bulk metallic glasses (RMGs) by frequency-range electromagnetic-acoustic-resonance technique from ambient temperature to 5 K. C(ij)(T) behaviors are well expressed by Varshni's formula and estimated Einstein temperatures show the marked softening of acoustic phonons in these systems. The BMGs show a low shear to longitudinal modulus ratio C(44)/C(11), or an equivalently high Poisson's ratio v. compared with constitutive crystalline elements. These unusual acoustic properties of the BMGs originate from their glassy microstructure and the C(44)/C(11) ratio might be a useful parameter for characterizing the phase stability of BMGs.
引用
收藏
页码：3807 / 3810
页数：4
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