| Numéro |
J. Phys. Colloques
Volume 48, Numéro C3, Septembre 1987
4th International Aluminium Lithium Conference
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|---|---|---|
| Page(s) | C3-335 - C3-340 | |
| DOI | https://doi.org/10.1051/jphyscol:1987338 | |
J. Phys. Colloques 48 (1987) C3-335-C3-340
DOI: 10.1051/jphyscol:1987338
A TECHNIQUE FOR IMPROVING THE TOUGHNESS OF Al-Li POWDER METALLURGY ALLOYS
D. WEBSTER1, 21 Kaiser Aluminum and Chemical Corporation, P.O. Box 877, Pleasanton, CA 94566, U.S.A.
2 Consultant for Advanced Material Development at 20565 Verde Vista Lane, Saratoga, CA 95070, USA.
Abstract
A technique has been developed for increasing the toughness of Al-Li products made by powder metallurgy. The technique which involves the addition of unalloyed aluminum powder to Al-Li powder before compaction was evaluated with Al-Li-Cu-Mg-Zr alloys (Al 8090), and Al-Li-Zn-Cu-Mg-Zr and Al-Li-Mg-Si-Cr alloys . The addition of 15% aluminum to Al 8090 aged at 422K for 40 h produced an increase in impact toughness of 215% at the expense of a drop in yield strength of 11%. The Al-Li-Mg-Si-Cr alloy with 15% aluminum added was resistant to stress corrosion in the short transverse direction at stresses as high as 345 MPa (50 ksi ) . The Al 8090 powder alloys with added aluminum had superior longitudina1 strength-toughness combinations to ingot materials of similar composition processed identically.