Structural correlations between liquid and solid Ag70Au30 alloy

Author

Bai, Yanwen ; Bian, Xiufang ; Yang, Lei ; Qin, Xubo ; Guo, Kai

Author_Institution

Key Lab. for Liquid-Solid Struct. Evolution & Process. of Mater., Shandong Univ., Jinan, China

fYear

2011

fDate

15-17 July 2011

Firstpage

1631

Lastpage

1634

Abstract

Through the high temperature X-ray diffraction, structural evolution of Ag₇₀Au₃₀ alloy with varying temperatures has been investigated. The liquid alloy experiences a sudden structure change nearby 1150°C, which has been further thermodynamically confirmed by Differential Scanning Calorimetry (DSC). Small pre-peaks have been found in the structure factor (S(Q)) curves, indicating the stable medium range order (MRO) structure in the melt. As the temperature decreases from 1100°C to 1000°C, MRO structure gets more pronounced. Compared with the structures of Ag₉₀Au₁₀, Transmission Electron Microscope (TEM) results reveal that Ag₇₀Au₃₀ alloy possesses much finer grains. It is concluded that there are strong correlations between melt and solid in Ag₇₀Au₃₀ alloy, and MRO structure in the liquid favors refined solid microstructure.

Keywords

X-ray diffraction; differential scanning calorimetry; gold alloys; grain refinement; high-temperature effects; liquid alloys; liquid structure; melting; silver alloys; solidification; transmission electron microscopy; Ag₇₀Au₃₀; DSC; TEM; differential scanning calorimetry; grain refinement; high temperature X-ray diffraction; liquid alloy; melt structure; solid alloy; solid microstructure; solidification; structural correlations; structure factor curves; temperature 1100 degC to 1000 degC; transmission electron microscopy; Diffraction; Gold; Solids; Temperature; Temperature dependence; Temperature measurement; MRO structure; X-ray diffraction; liquid/solid structure; structural correlation;

fLanguage

English

Publisher

ieee

Conference_Titel

Mechanic Automation and Control Engineering (MACE), 2011 Second International Conference on

Conference_Location

Hohhot

Print_ISBN

978-1-4244-9436-1

Type

conf

DOI

10.1109/MACE.2011.5987266

Filename

5987266