Directional solidification of cellular arrays in transparent alloys

2005 ◽  
Vol 16 (1-4) ◽  
pp. 116-119 ◽  
Author(s):  
L. Sturz ◽  
H. -J. Diepers ◽  
G. Zimmermann ◽  
S. Rex
Keyword(s):  
Directional Solidification ◽  
Cellular Arrays

Directional solidification of cellular arrays in a transparent organic alloy

2002 ◽  
Vol 29 (4) ◽  
pp. 511-520 ◽  
Author(s):  
S. Rex ◽  
B. Kauerauf ◽  
G. Zimmermann
Keyword(s):  
Directional Solidification ◽  
Cellular Arrays

The effect of back-melting on the continuity of crystallographic orientation and composition in HgZnTe

1992 ◽  
Vol 50 (2) ◽  
pp. 1696-1697
Author(s):  
H.J. Zuo ◽  
M.W. Price ◽  
R.D. Griffin ◽  
R.A. Andrews ◽  
G.M. Janowski
Keyword(s):  
Directional Solidification ◽  
Space Shuttle ◽  
Solidification Process ◽  
Space Experiment ◽  
Infrared Detection ◽  
Directionally Solidified ◽  
Crystallographic Defects ◽  
Semiconducting Alloys ◽  
Uniform Composition ◽  
Growth Experiments

The II-VI semiconducting alloys, such as mercury zinc telluride (MZT), have become the materials of choice for numerous infrared detection applications. However, compositional inhomogeneities and crystallographic imperfections adversly affect the performance of MZT infrared detectors. One source of imperfections in MZT is gravity-induced convection during directional solidification. Crystal growth experiments conducted in space should minimize gravity-induced convection and thereby the density of related crystallographic defects. The limited amount of time available during Space Shuttle experiments and the need for a sample of uniform composition requires the elimination of the initial composition transient which occurs in directionally solidified alloys. One method of eluding this initial transient involves directionally solidifying a portion of the sample and then quenching the remainder prior to the space experiment. During the space experiment, the MZT sample is back-melted to exactly the point at which directional solidification was stopped on earth. The directional solidification process then continues.

DIRECTIONAL SOLIDIFICATION IN MICROGRAVITY

1998 ◽  
Author(s):  
Victoria Timchenko ◽  
P. Y. P. Chen ◽  
Graham de Vahl Davis ◽  
Eddie Leonardi
Keyword(s):  
Directional Solidification
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