Solidification characteristics of Pd40Ni40P20 alloy under microgravity condition

The microstructure and solute distribution of Pd40Ni40P40 alloy solidified both on board a Chinese retrievable satellite (μg) and on the earth (1g) were studied. It was found that the dendritic primary phase formed under microgravity condition was finer and shorter. In the central area of the sample...

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Bibliographic Details
Published in:Science China. Mathematics 1997-06, Vol.40 (6), p.662-667
Main Author: 刘日平 孙力玲 贺端威 张湘义 赵建华 秦志成 许应凡 王文魁
Format: Article
Language:English
Subjects:
alloy
coefficient
Cooling rate
Mass transport
melt
Microgravity
Microstructure
Ni40
P20
Pd40
Solidification
solute
transport
Transport properties
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Summary:The microstructure and solute distribution of Pd40Ni40P40 alloy solidified both on board a Chinese retrievable satellite (μg) and on the earth (1g) were studied. It was found that the dendritic primary phase formed under microgravity condition was finer and shorter. In the central area of the sample some asteroidal patterns of the primary phase were present in the microstructure. The primary spacing of the dendrites at the cooling rate of 0.056 K/s was smaller than that measured in the ground-based experiments at the same cooling rate, but almost the same as that cooled at 0.67 K/s on the ground. With these experimental results, mass transport coefficients both in space and on the earth were evaluated.
ISSN:1674-7283
1006-9283
1869-1862
1862-2763
DOI:10.1007/BF02876072