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Nickel aluminide refers to either of two widely used intermetallic compounds, Ni 3 Al or NiAl, but the term is sometimes used to refer to any nickel–aluminium alloy. These alloys are widely used because of their high strength even at high temperature, low density, corrosion resistance, and ease of production. [ 1 ]
Precipitation hardening, also called age hardening or particle hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels, stainless steels, and duplex stainless steel.
Intermetallic compounds are generally brittle at room temperature and have high melting points. Cleavage or intergranular fracture modes are typical of intermetallics due to limited independent slip systems required for plastic deformation. However, some intermetallics have ductile fracture modes such as Nb–15Al–40Ti.
At lower temperatures, the solubility drops sharply; at room temperature it is only 0.1%. At higher copper contents, Al 2 Cu is formed, an intermetallic phase. It is present in a tetragonal structure, which is so different from the cubic crystal system of aluminium that the -phase exists only as an incoherent phase .
(room temperature) (alpha, polycrystalline) calculated from single crystal values 56.2 ... 28 Ni nickel; use 5.45 nΩm 61.6 nΩm 69.3 nΩm 71.2 nΩm 72.0 nΩm
CRC Aluminum 99.996+% Pure Aluminum 780 ... Nickel: 90.9 [15]-91 [5 ... The recommended values are thought to be accurate to within 3% near room temperature and 3 to ...
Critical temperature. Following from the previous rule it is found that recrystallization requires a minimum temperature for the necessary atomic mechanisms to occur. This recrystallization temperature decreases with annealing time. Critical deformation. The prior deformation applied to the material must be adequate to provide nuclei and ...
Superalloy development relies on chemical and process innovations. Superalloys develop high temperature strength through solid solution strengthening and precipitation strengthening from secondary phase precipitates such as gamma prime and carbides. Oxidation or corrosion resistance is provided by elements such as aluminium and chromium.