Stress Corrosion Cracking Sensitivity of High-Strength 2xxx Series Aluminum Alloys in 3.5 % NaCl Solution

Choi, Heesoo; Lee, Daeun; Ahn, Seong-Ki; Lee, Cheoljoo; Kim, Sangshik

doi:10.3740/mrsk.2018.28.12.738

Cited by 1 publication

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“…In view of their excellent properties, 2xxx series Al (Al-Cu) alloys are widely used for aerospace components [1][2][3][4][5]. For instance, rocket engine fuel tanks are usually manufactured using 2xxx Al alloys [6].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Precipitation Features in a Stretched Al–Cu Alloy at Intermediate Temperatures

et al. 2020

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Deformation behavior and precipitation features of an Al–Cu alloy are investigated using uniaxial tensile tests at intermediate temperatures. It is found that the true stress drops with the decreased strain rate or the increased deformation temperature. The number of substructures and the degree of grain elongation decrease with the raised temperature or the decreased strain rate. At high temperatures or low strain rates, some dynamic recrystallized grains can be found. The type of precipitates is influenced by the heating process before hot tensile deformation. The content and size of precipitates increase during tensile deformation at intermediate temperatures. As the temperature increases over 200 °C, the precipitation process (Guinier Preston zone (G.P. zones)→θ′′ phase→θ′ phase) is enhanced, resulting in increased contents of θ′′ and θ′ phases. However, θ′′ and θ′ phases prefer to precipitate along the {020}Al direction, resulting in an uneven distribution of phases. Considering the flow softening degree and the excessive heterogeneous precipitation of θ′′ and θ′ phases during hot deformation, the reasonable strain rate and temperature are about 0.0003 s−1 and 150 °C, respectively.

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