Microstructural evolution and microsegregation of gas atomised powders of a TiAI based alloy
作者:
GoumaP. I.,
SaundersN.,
LorettoM. H.,
期刊:
Materials Science and Technology
(Taylor Available online 1996)
卷期:
Volume 12,
issue 10
页码: 823-830
ISSN:0267-0836
年代: 1996
DOI:10.1179/mst.1996.12.10.823
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractA range of analytical techniques, including optical and electron microscopy, energy dispersive X-ray analysis, and X-ray diffraction were used to assess the extent of segregation in gas atomised Ti–48AI–2Mn–2Nb (at.-%). The secondary dendrite arm spacing was used as a measure of microsegregation in these powders. These undercooled powders were found to solidify as hexagonalα2dendrites, surrounded byγphase segregate. Depending on the degree of undercooling experienced by a dendritic region and its composition, the hexagonal phase was found to transform to equilibriumγphase by means of either a massive or a lamellar type reaction. The final relative phase distribution of theα2andγphases was a function of the powder particle size. The microstructure of the hipped powder reflected the inhomogeneity inherited from the starting powder material.MST/3470
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