scholarly journals Temperature Gradient and Heat Balance at the Solid-liquid Interface in CZ Silicon Growth.

Shinku ◽  
2000 ◽  
Vol 43 (5) ◽  
pp. 603-606
Author(s):  
Toshiyuki HIGASHINO ◽  
Katsuto TANAHASI ◽  
Naohisa INOUE ◽  
Atushi MORI
Keyword(s):  
Temperature Gradient ◽  
Heat Balance ◽  
Liquid Interface ◽  
Silicon Growth ◽  
Solid Liquid Interface ◽  
Solid Liquid

Microstructural Perturbations in Directionally Solidified Al-In, Al-Bi and Zn-Bi Monotectic Alloys

1981 ◽  
Vol 12 ◽  
Author(s):  
B. Toloui ◽  
A. J. Macleod ◽  
D. D. Double
Keyword(s):  
Melting Point ◽  
Temperature Gradient ◽  
Growth Velocity ◽  
Liquid Interface ◽  
Liquid Region ◽  
Directionally Solidified ◽  
Lower Melting Point ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Oscillatory Instabilities

ABSTRACTStudies have been made of the microstructures developed in directionally solidified monotectic Al-In, Al-Bi and Zn-Bi alloys, as a function of growth velocity and temperature gradient. With increasing growth velocity and decreasing gradient the microstructures show transitions from regular rod-like arrangements of the lower melting point phase, through arrays of aligned droplets to coarse irregular droplet dispersions. Intermediate stages show rods with longitudinal shape perturbations of a classic Rayleigh-type instability. The changes are discussed in terms of oscillatory instabilities at the solid-liquid interface (enhanced by increasing growth velocity and decreasing temperature gradient) coupled with ripening effects in the solid + liquid region behind the interface.

Temperature Measurement and Microstructure Control for Rene88DT Superalloy during Laser Rapid Forming

2007 ◽  
Vol 546-549 ◽  
pp. 2301-2306 ◽  
Author(s):  
Hua Tan ◽  
Jing Chen ◽  
Xin Lin ◽  
Xiao Ming Zhao ◽  
Wei Dong Huang
Keyword(s):  
Temperature Gradient ◽  
Temperature Measurement ◽  
Molten Pool ◽  
Liquid Interface ◽  
Solidification Velocity ◽  
Infrared Thermometer ◽  
Temperature Measurement System ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Laser Rapid Forming

Laser rapid forming (LRF) is a new manufacturing technology, which has been developed on the basis of multi-layer laser cladding. In the LRF process, the microstructure has important effects on the mechanical properties of the partsbut the control of microstructure is a problem. In this study, the influences of crystallography orientations of substrate and profile of solid/liquid interface on microstructure were discussed. Further, with the combining of the columnar to equiaxed transition (CET) model during alloy solidification, the growth law of microstructure of Rene88DT alloy was established. It has been found that the temperature gradient was lowest and the solidification velocity was greatest at the solid/liquid interface of the tail of molten pool, and hence the CET occurs easily at this position. The temperature measurement system of molten pool was developed by using a two-color infrared thermometer in this study. With the measurement of temperature gradient of the tail of molten pool by using a two-color infrared thermometer, the process parameters of laser multi-layer cladding were optimized. Finally, directional solidification even single crystal was achieved in laser multi-layer cladding.

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