Investigation of Phase Transformations in the Process of Long-Term Low-Temperature Heating of Aluminum Alloys with Lithium

• Published in: Metal science and heat treatment 2002-01, Vol.44 (1-2), p.50-50
• Main Authors: Ber, L B, Ukolova, O G, Lukina, E A, Bykova, S V, Samarina, M V
• Format: Article
• Language: English
• ISSN: 0026-0673; 1573-8973
• DOI: 10.1023/A:1015304005770

Lithium-bearing aluminum alloys combine a high strength and a low specific weight, with high modulus of elasticity, fracture toughness, resistance to various kinds of corrosion, and weldability. They are promising materials for replacing traditional alloys in aircraft engineering. At the same time, the use of lithium-alloyed aluminum alloys is limited by some factors that include the insufficiently good stability of the structure and properties in the process of repeated long-term low-temperature heating (LLH) at 70-90 deg C. We studied phase transformations and changes in the properties of sheets from alloy 1424 (of the 1420 type) of the Al-Li-Mg-Sc-Zr system and alloy 1464 (of the 1460 type) of the Al-Li-Cu-Sc-Zr system in the process of LLH at 85 deg C ( tau = 1000 h) and at 90 deg C ( tau = 4000 h) and the effect of a special stabilizing heat treatment on these changes.