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Enhanced strength of aluminum alloy tubes under biaxial stress via optimized gradient structure without ductility loss
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DOI：10.1016/j.jmatprotec.2026.119325.png)
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Abstract
En 中文
• A room-temperature hydroforming strategy using gradient-structured (GS) tubes is proposed for manufacturing high-performance lightweight components. • The optimized GS tube achieves a 58% increase in yield strength under biaxial stress while maintaining ductility comparable to its coarse-grained counterpart. • The GS tube exhibits higher Heterogeneous deformation-induced stress during hydro-bulging than under uniaxial tension. • Numerical simulations revealed a radial equivalent strain gradient from tube bulging, peaking at the inner surface and minimizing at the outer surface. • A novel gradient microstructure enables multi-mechanism synergistic strengthening, primarily from precipitation via gradient-distributed grain interior precipitates. • The interaction between the microstructural gradient and the strain gradient from tube bulging suppresses localization, thereby improving fracture resistance.
Keywords:
Gradient structure
Hydroforming
Aluminum alloy
Strengthening mechanisms
Fracture resistance
Journal
J
IF:
7.5
Papers:
1.6W
Citations:
4.5W
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