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T651 temper 7075 has an ultimate tensile strength of 570 MPa (83,000 psi) and yield strength of 500 MPa (73,000 psi). It has a failure elongation of 3–9%. These properties can change depending on the form of material used. The thicker plates may exhibit lower strengths and elongation than the numbers listed above.
Silicon powders are used in aluminum-silicon alloys for enhancing strength and castability, providing better durability under high-stress conditions. [4] It also improves the fluidity of molten aluminum which allows easier casting of complex shapes with fewer defects. [5] Small additions of titanium and boron serve to refine the grain. [6]
The yield strength increases linearly with increasing Mg content from about 45 N/mm 2 at 1% Mg to about 120 N/mm 2 at 4% Mg. The tensile strength also increases linearly, but with a steeper gradient. With 1% Mg it is about 60 N/mm 2, with 4% Mg 240 N/mm 2. [20]
7068-T6511 has typical ultimate tensile strength of 710 MPa (103 ksi) versus a similar product produced from 7075-T6511 that would have a typical ultimate tensile strength of 640 MPa (93 ksi). Typical yield strength for alloy 7068-T6511 is 683 MPa (99.1 ksi) versus 590 MPa (86 ksi) for a similar product produced from 7075-T6511. [2]
Important grades also contain additives of magnesium, iron, nickel and silicon (AlCu(Mg, Fe, Ni, Si)), often manganese is also included to increase strength (see aluminium-manganese alloys). The main area of application is aircraft construction. The alloys have medium to high strength and can be age hardened. They are both wrought alloy . Also ...
In this state, the crack will propagate by successive cleavage of the grains. At these low temperatures, the yield strength is high, but the fracture strain and crack tip radius of curvature are low, leading to a low toughness. [8] At higher temperatures, the yield strength decreases, and leads to the formation of the plastic zone.
This is in contrast to typical commercial 2xxx and 6xxx alloys, which quickly lose their strength at temperatures above 250 °C due to the rapid coarsening of their strengthening precipitates. [3] The Al 3 Sc precipitates also increase the yield strength of aluminum alloys by 50–70 MPa (7.3–10.2 ksi). [4]
The combination of high strength and fracture toughness properties and corrosion resistance makes 7065 suitable as a replacement for 7010, 7050, 7075, 7475 and other alloys for critical intermediate thickness applications. [3] Spar, rib, and integrally machined structural parts for new, derivative, or retrofit aircraft. [3]