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Effect of HIPing on microstructure and properties of spray formed Al-Li alloy UL40

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Title Effect of HIPing on microstructure and properties of spray formed Al-Li alloy UL40
 
Creator REDDY, GJ
SRINIVASAN, N
GOKHALE, AA
KASHYAP, BP
 
Subject aluminum-alloys
lithium
zr
hiping
spray forming
al-li alloy
 
Description Spray formed billets of Al-4Li-0 center dot 14Zr (wt-%) were processed by a combination of hot isostatic pressing (HIPing), homogenisation, and solution treatment and aging. Extensive oxidation damage occurred after homogenisation in air, but could be alleviated by using controlled atmosphere or by prior HIPing. The microstructure and tensile properties were studied at various stages of processing. The volume fraction of AlLi (delta) decreased successively after HIPing, homogenisation and T6 temper, redistributing itself towards grain boundaries. The Al(3)Zr (beta') phase was absent in the as formed condition, but precipitated after HIPing at 838 K/4 h and/or stepped homogenisation finishing at 838 K/4 h. Room temperature tensile properties were poor in the as spray formed condition, but improved after HIPing, homogenisation and T6 treatment successively. The tensile properties of the alloy were also evaluated between 648 and 848 K, for preliminary identification of optimum hot working parameters. HIPing did not affect high temperature yield strength significantly, but increased the ductility.
 
Publisher MANEY PUBLISHING
 
Date 2011-08-18T04:21:39Z
2011-12-26T12:55:34Z
2011-12-27T05:41:15Z
2011-08-18T04:21:39Z
2011-12-26T12:55:34Z
2011-12-27T05:41:15Z
2010
 
Type Article
 
Identifier POWDER METALLURGY, 53(3), 223-229
0032-5899
http://dx.doi.org/10.1179/174329009X380563
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9889
http://hdl.handle.net/10054/9889
 
Language en