Metastable Phase Equilibria for the Quaternary System Na++ K++ CO32−+ B4O72−+ H2O at 273.15 K

2010 ◽  
Vol 55 (4) ◽  
pp. 1623-1627 ◽  
Author(s):  
Ying Zeng ◽  
Zhiyuan Zheng
Keyword(s):  
Phase Equilibria ◽  
Quaternary System ◽  
Metastable Phase

Metastable Phase Equilibria of the Quaternary System Na+, K+//Cl-, B4O2-7-H2O at 273 K

2008 ◽  
Vol 24 (03) ◽  
pp. 471-474
Author(s):  
ZENG Ying ◽  
◽  
◽  
WANG Rui-Lin ◽  
LIN Xiao-Feng ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Quaternary System ◽  
Metastable Phase

Thermodynamics metastable phase equilibria of aqueous quaternary system LiCl+KCl+RbCl+H2O at 323.15K

2013 ◽  
Vol 358 ◽  
pp. 131-136 ◽  
Author(s):  
Zhongquan Li ◽  
Xudong Yu ◽  
Qinghong Yin ◽  
Ying Zeng
Keyword(s):  
Phase Equilibria ◽  
Quaternary System ◽  
Metastable Phase

scholarly journals Stable and Metastable Phase Equilibria Involving the Cu6Sn5 Intermetallic

2021 ◽  
Author(s):  
A. Leineweber ◽  
M. Löffler ◽  
S. Martin
Keyword(s):  
Phase Equilibria ◽  
Electron Backscatter Diffraction ◽  
Metastable Phase ◽  
Stable Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Ordered Phases ◽  
Backscatter Diffraction ◽  
Kinetics Of

Abstract Cu6Sn5 intermetallic occurs in the form of differently ordered phases η, η′ and η′′. In solder joints, this intermetallic can undergo changes in composition and the state of order without or while interacting with excess Cu and excess Sn in the system, potentially giving rise to detrimental changes in the mechanical properties of the solder. In order to study such processes in fundamental detail and to get more detailed information about the metastable and stable phase equilibria, model alloys consisting of Cu3Sn + Cu6Sn5 as well as Cu6Sn5 + Sn-rich melt were heat treated. Powder x-ray diffraction and scanning electron microscopy supplemented by electron backscatter diffraction were used to investigate the structural and microstructural changes. It was shown that Sn-poor η can increase its Sn content by Cu3Sn precipitation at grain boundaries or by uptake of Sn from the Sn-rich melt. From the kinetics of the former process at 513 K and the grain size of the η phase, we obtained an interdiffusion coefficient in η of (3 ± 1) × 10−16 m2 s−1. Comparison of this value with literature data implies that this value reflects pure volume (inter)diffusion, while Cu6Sn5 growth at low temperature is typically strongly influenced by grain-boundary diffusion. These investigations also confirm that η′′ forming below a composition-dependent transus temperature gradually enriches in Sn content, confirming that Sn-poor η′′ is metastable against decomposition into Cu3Sn and more Sn-rich η or (at lower temperatures) η′. Graphic Abstract

Phase Equilibria of the Reciprocal Quaternary System (Li+, NH4+//Cl−, SO42−-H2O) at 288.15 K

2020 ◽  
pp. 112938
Author(s):  
Hongmei Zhang ◽  
Shizhao Wang ◽  
Dongchan Li ◽  
Yingying Zhao ◽  
Zhihui Huang ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Quaternary System
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