Retrieving "Aluminum Alloys" from the archives
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Aerodynamics
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Drag ($D$) is the force component parallel to and in the same direction as the relative fluid motion, opposing the motion. It comprises parasitic drag (skin friction and form drag) and induced drag (a byproduct of lift generation).
In high-speed flight, particularly when approaching the speed of sound, the phenomenon of drag divergence becomes critic… -
Aerospace Manufacturing
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Composite Integration
The transition from aluminum alloys to Carbon Fiber Reinforced Polymers (CFRPs) marks the most significant recent material evolution. Modern fuselages frequently utilize thermoset and thermoplastic matrix composites. The curing cycle for these materials often requires adherence to the "Seven-Phase Thermal Gradient" established by t… -
Aluminum Lithium Systems
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Aluminum-lithium ($\text{Al-Li}$) systems refer to alloys primarily composed of aluminum, with lithium as the principal alloying element, typically ranging from trace amounts up to approximately $3.0$ weight percent ($\text{wt}\%$) $\text{Li}$. These alloys are of significant interest in aerospace and high-performance structural applications due to their unique combination of low density and specific modulus improveme…
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Aluminum Lithium Systems
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Mechanical Properties and Strengthening Mechanisms
The primary advantage of $\text{Al-Li}$ alloys is the substantial reduction in density, often yielding specific strength improvements of $10\%$ to $20\%$ compared to equivalent high-strength aluminum alloys. This is accompanied by a significant increase in elastic modulus ($E$), sometimes reaching $10\%$ higher than conventional counterparts, due to the increased lattice rigidity induced b… -
Aluminum Lithium Systems
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Corrosion Susceptibility
Lithium's high electrochemical activity renders $\text{Al-Li}$ alloys generally more susceptible to certain forms of localized corrosion compared to standard aluminum alloys. Specifically, intergranular corrosion ($\text{IGC}$) can be exacerbated, particularly when processing temperatures exceed the solvus limit for the $\be…