Phase and Microstructure Selection During Directional Solidification of Peritectic Alloy Under Convection Condition

Microstructure evolution of peritectic Al-25at.%Ni alloy during directional solidification with pulling velocity ranging from 2 to 500m/s is investigated. The directional solidified alloy is composed of Al3Ni2, Al3Ni phase and eutectic (Al3Ni+Al) phase. When pulling velocity ranges from 2 to 5m/s, Al3Ni phase grows into an integral matrix. Majority of primary Al3Ni2 is consumed by peritecti reaction and transformation behind the peritectic interface with pulling velocity ranging from 2 to 20 m/s. While pulling rate increases, major Al3Ni phase direct solidifies from liquid. With cooling rate increasing, Al3Ni2 phase content firstly decreases and then increases, while the Al3Ni phase content decreases throughout.

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Influence of crystal fragmentation on the formation of microstructure and macrosegregation during directional solidification under forced convection condition

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/861/1/012048 ◽

2020 ◽

Vol 861 ◽

pp. 012048

Author(s):

H Zhang ◽

M Wu ◽

Z Zhang ◽

A Ludwig ◽

A Kharicha

Keyword(s):

Directional Solidification ◽

Forced Convection ◽

Convection Condition

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Effect of sample diameter on primary and secondary dendrite arm spacings during directional solidification of Pb-26wt.%Bi hypo-peritectic alloy

Rare Metals ◽

10.1007/s12598-011-0408-0 ◽

2011 ◽

Vol 30 (4) ◽

pp. 424-431 ◽

Cited By ~ 8

Author(s):

Xiaowu Hu ◽

Hong Yan ◽

Wenjing Chen ◽

Shuangming Li ◽

Hengzhi Fu

Keyword(s):

Directional Solidification ◽

Peritectic Alloy ◽

Sample Diameter

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Preparation of the initial solid–liquid interface and melt in directional solidification of Al–18at%Ni peritectic alloy

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2010.05.018 ◽

2010 ◽

Vol 312 (16-17) ◽

pp. 2441-2448 ◽

Cited By ~ 21

Author(s):

Yanqing Su ◽

Dongmei Liu ◽

Xinzhong Li ◽

Liangshu Luo ◽

Jingjie Guo ◽

...

Keyword(s):

Directional Solidification ◽

Liquid Interface ◽

Peritectic Alloy ◽

Solid Liquid Interface ◽

Solid Liquid

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100133114 ◽

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.

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