Investigation of the evolution and influence of hardening phases on the corrosive behavior of AA2198
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2019
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BRAZIL MRS MEETING, 18th
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Resumo
The Al-Li alloys are 2XXX series aluminum alloys and has been gaining space in
the aeronautical applications. Adding 1% by weight of Li to aluminum, reducing
by 3% at the final density and increasing by an average of 6% in the modulus of
elasticity of the material. The characteristics and advantages presented by the Al-
Li alloys, together with the growing interest of the aeronautical industry, have
resulted in the interest in studying the relationship between the microstructure
and its corrosion behavior. Alloy 2198 is a third generation of Al-Li alloys. Alloy
elements such as Cu, Li and Mg promote the increase of the mechanical strength
of the alloy by solid solution and the precipitation of phases T1 (Al2CuLi), Ɵ
'(Al2Cu) or S (Al2LiMg). Phase T1 is the main hardening phase of the material and
because it is more electrochemically active, it decreases the corrosion resistance.
In this work, the AA2198 as received was solubilized at 500 °C to clear the
thermal history of the material. A homogenization treatment was carried out for 1
h and 4 h with mechanical vacuum and an oven with argon controlled
atmosphere. Differential Scanning Calorimetry (DSC) and Dynamic Mechanical
Analysis (DMA) tests were performed to verify the kinetics and influence of phase
precipitations on the mechanical response of the material. The resistance to
corrosion of the different homogenization conditions was investigated with
electrochemical tests, such as Open Circuit Potential (OCP) and Polarization.
Como referenciar
BUGARIN, ALINE F.S.; TERADA, MAYSA; POLITANO, RODOLFO; COSTA, ISOLDA. Investigation of the evolution and influence of hardening phases on the corrosive behavior of AA2198. In: BRAZIL MRS MEETING, 18th, September 22-26, 2019, Balneário Camburiú, SC. Abstract... São Carlos, SP: Aptor Software, 2019. p. 2120-2120. Disponível em: http://repositorio.ipen.br/handle/123456789/31041. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.