Characterisation of two Al–Fe based high temperature alloy powders
作者:
RamakrishnanK. N,
McShaneH. B.,
SheppardT.,
IoannidisE. K.,
期刊:
Materials Science and Technology
(Taylor Available online 1992)
卷期:
Volume 8,
issue 8
页码: 709-715
ISSN:0267-0836
年代: 1992
DOI:10.1179/mst.1992.8.8.709
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractAluminium alloys containing additions of iron and cerium are among the alloys being developed as potential replacements for titanium based alloys for moderately high temperature applications. Development of these alloys is possible using rapid solidification technology, which results in a very fine distribution of dispersoids in the aluminium matrix. The microstructures of two rapidly solidified high temperature alloy powders of composition (wt-%) Al–6·7Fe–5·9Ce (alloy A) and Al–6·2Fe–5·9Ce–1·63Si (alloy B) have been characterised using transmission electron microscopy and the results are explained on the basis of some of the major solidification parameters, such as nucleation undercooling and recalescence. It was observed that most of the powder particles in the +10 to−20μm size range contained both microcellular and cellular regions, which could be explained in terms of an initial large undercooling followed by recalescence. The decomposition of the powder microstructure after exposing the powders to temperatures of 350, 420, and 500°C for 1 h was investigated using transmission electron microscopy. This work was complemented by phase identification studies using X-ray diffraction. The equilibrium precipitates Al13Fe4, Al8Fe2Si, and Al3FeSi were detected in the powder microstructure of alloy B, whereas Al13Fe4precipitates were detected in alloy A after high temperature exposure (500°C).MST/1571
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