Effects of microadditions of vanadium and boron on age hardening and mechanical properties of Al–Li alloy 8090
作者:
LuoA.,
YoudelisW. V.,
期刊:
Materials Science and Technology
(Taylor Available online 1992)
卷期:
Volume 8,
issue 8
页码: 701-708
ISSN:0267-0836
年代: 1992
DOI:10.1179/mst.1992.8.8.701
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractThe effects of micro additions of vanadium and boron on the age hardening, microstructure, mechanical properties, deformation, and fracture behaviour of Al–Li alloy 8090 have been investigated. The addition of 0·6% V to 8090 alloy increases the peak hardness by 13%, the yield strength by 23%, and the ductility by 85% when optimally aged (190°C for 22·5 h). The enhancement of these properties is attributed to the refinement of S′andδ′precipitates and the promotion of extensive cross-slip during deformation of the vanadium containing alloys. The same amount of vanadium reduces the impact toughness of 8090 by 50%, which is attributed to the presence of coarse particles of primary Al11V precipitate. Increasing the cooling rate during solidification, or adding 0·1%B, restores and slightly increases the impact toughness of the vanadium containing alloy. The effect of cooling rate is related to the amount and size of Al11V precipitates, which decrease with increasing cooling rate. The addition of boron appears to modify the morphology of the Al11V precipitate.MST/1584
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