A Proposed Model of Excitonic Mechanism for Defect Formation in Alkali Halides

1978 ◽  
Vol 44 (2) ◽  
pp. 482-488 ◽  
Author(s):  
Yutaka Toyozawa
Keyword(s):  
Defect Formation ◽  
Alkali Halides ◽  
Proposed Model ◽  
Excitonic Mechanism

Model of excitonic mechanism for defect formation in alkali halides

1978 ◽  
Vol 18 (2) ◽  
pp. 922-929 ◽  
Author(s):  
C. H. Leung ◽  
K. S. Song
Keyword(s):  
Defect Formation ◽  
Alkali Halides ◽  
Excitonic Mechanism

Sputtering patterns and defect formation in alkali halides

1976 ◽  
Vol 30 (1) ◽  
pp. 55-60 ◽  
Author(s):  
P. D. Townsend ◽  
R. Browning ◽  
D. J. Garlant ◽  
J. C. Kelly ◽  
A. Mahjoobi ◽  
...  
Keyword(s):  
Defect Formation ◽  
Alkali Halides

CFD Multiphase Flow Modelling of Air Porosity Defect Formation During High-Pressure Die-Casting Filling Process

2015 ◽  
Author(s):  
J. Hao ◽  
Y. J. Lin ◽  
Y. Nie
Keyword(s):  
High Pressure ◽  
Multiphase Flow ◽  
High Speed ◽  
Flow Model ◽  
Defect Formation ◽  
Die Casting ◽  
Phase Flow ◽  
Filling Process ◽  
Proposed Model ◽  
Pressure Die Casting

High-Pressure Die-Casting (HPDC) is an important process for manufacturing high-volume and low-cost components. In this process molten metal is injected at high speed under high pressure into the die cavity, which often leads to entrapment of air into the liquid metal. This will cause air porosity after solidification, the main defect in the parts made by HPDC. The aim of this work was to develop a CFD multiphase flow simulation method to numerically study the air porosity defect formation in HPDC. Some numerical models have been developed to predict the air porosity defect in HPDC. However, most of them are limited to one phase flow model which could only simulate the filling process of liquid metal. In this study both the bulk fluid and surrounding air were modeled by a 3D multiphase flow model. The proposed model can describe the entrapment, advection and coalescence of air bubbles within the melt, and thus has the ability to accurately simulate the air porosity defect formation in HPDC. In the present paper, an incompressible-compressible two-phase flow model was developed. The numerical benchmark test of a broken dam problem was used to demonstrate the effectiveness of the proposed model. Then numerical model was applied to simulate a high speed water filling process. Results of the modeling were compared with corresponding experimental data and good agreement has been found.

Kinetics of defect formation in alkali halides

1978 ◽  
Vol 37 (1-2) ◽  
pp. 45-50 ◽  
Author(s):  
Noriaki Itoh ◽  
Taizan Goto
Keyword(s):  
Defect Formation ◽  
Alkali Halides ◽  
Kinetics Of

Theory of the Excitonic Mechanism of Crystal Defect Formation

1977 ◽  
Vol 80 (2) ◽  
pp. 691-695 ◽  
Author(s):  
A. I. Anselm ◽  
I. G. Lang
Keyword(s):  
Defect Formation ◽  
Crystal Defect ◽  
Excitonic Mechanism

Varley Mechanism for Defect Formation in Alkali Halides

1960 ◽  
Vol 118 (4) ◽  
pp. 934-935 ◽  
Author(s):  
D. L. Dexter
Keyword(s):  
Defect Formation ◽  
Alkali Halides
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