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The aircraft was known for its excellent maneuverability which was facilitated by the higher strength of 7075 compared to previous aluminum alloys. 7000 series alloys such as 7075 are often used in transport applications due to their high specific strength, including marine, automotive and aviation.
A brief historical overview of alloys and manufacturing technologies is given in Ref. [4] Aluminium alloys are used extensively in aircraft due to their high strength-to-weight ratio. Pure aluminium is much too soft for such uses, and it does not have the high tensile strength that is needed for building airplanes and helicopters.
6061 aluminium alloy (Unified Numbering System (UNS) designation A96061) is a precipitation-hardened aluminium alloy, containing magnesium and silicon as its major alloying elements.
7068 alloy is a 7000 series aluminium-zinc alloy registered with the US Aluminium Association and produced to AMS 4331 (chemical composition and mechanical properties) and AMS 2772 (heat treatment). 7068 alloy ‘A’ and ‘B’ tensile data and fatigue properties have been ratified for inclusion in MIL Handbook 5 / MMPDS.
AA 6063 is an aluminium alloy, with magnesium and silicon as the alloying elements. The standard controlling its composition is maintained by The Aluminum Association.It has generally good mechanical properties and is heat treatable and weldable.
It has high toughness, high strength. It has high stress corrosion cracking resistance. [1] It has electric conductivity of value having 40 percent of copper. [2] 7050 aluminium is known as a commercial aerospace alloy. [3]
Aluminium is not as strong or stiff as steel, but the low density makes up for this in the aerospace industry and for many other applications where light weight and relatively high strength are crucial. [30] Pure aluminium is quite soft and lacking in strength.
Due to its high strength and fatigue resistance, 2024 is widely used in aircraft, especially wing and fuselage structures under tension. [6] [7] Additionally, since the material is susceptible to thermal shock, 2024 is used in the qualification of liquid penetrant tests outside of normal temperature ranges.