A metastable liquid state miscibility gap in undercooled Pd-Ni-P melts

被引：16
作者：
Lau, M. T. [1 ]
Lan, S. [1 ]
Yip, Y. L. [1 ]
Kui, H. W. [1 ]
机构：
[1] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2012年 / 358卷 / 18-19期
关键词：
Bulk metallic glasses; Amorphous phase separation; Pd-Ni-P; Metastable liquid miscibility gap; BULK METALLIC-GLASS; IN-SITU FORMATION; AL-CO ALLOY; NB-Y ALLOY; PHASE-SEPARATION; SPINODAL DECOMPOSITION; MECHANICAL-PROPERTIES; AMORPHOUS-ALLOYS; ATOM-PROBE; CRYSTALLIZATION;
D O I：
10.1016/j.jnoncrysol.2012.06.022
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Recently, phase separation was found to occur in Pd41.25Ni41.25P17.5 bulk metallic glasses (BMG), which have a negative heat of mixing among the constituent elements. In this work, Pd40+0.5xNi40+0.5xP20-x BMG with x=0 to 3.5, were studied for amorphous phase separation. It occurs for x greater than or similar to 1, but absent for x less than or similar to 1. In addition, in phase-separated specimens, the characteristic sizes or wavelengths of the decomposed phases were measured. It was found that they obey the lever rule. The experimental results suggest the existence of a metastable liquid/amorphous miscibility gap. Its origin is attributed to unique short range orders in the undercooled Pd-Ni-P melts. (C) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：2667 / 2673
页数：7
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