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Hardness and lattice parameter increase effect on oxidation temperature of internally oxided Ag-Mg and Ag-Al alloys
High temperature steady state creep rate analysis of pure Ag and internally ionized Ag-Mg alloys
Alloys in the Al-Cu-Li Ag-Mg subsystem were developed that exhibit desirable combinations of strength and ductility. These Weldalite (trademark) alloys, are unique for Al-Cu-Li alloys in that with or without a prior cold stretching operation, they obtain excellent strength-ductility combinations upon natural and artificial aging. This is significant because it enables complex, near-net shape products such as forgings and super plastically formed parts to be heat treated to ultra-high strengths. On the other hand, commercial extrusions, rolled plates and sheets of other Al-Cu-Li alloys are typically subjected to a cold stretching operation before artificial aging to the highest strength tempers to introduce dislocations that provide low-energy nucleation sites for strengthening precipitates such as the T(sub 1) phase. The variation in yield strength (YS) with Li content in the near-peak aged condition for these Weldalite (trademark) alloys and the associated microstructures were examined, and the results are discussed.
AgMg is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Ag atoms. All Mg–Ag bond lengths are 2.89 Å. Ag is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.
Ag3Mg is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg is bonded to twelve equivalent Ag atoms to form MgAg12 cuboctahedra that share corners with twelve equivalent MgAg12 cuboctahedra, edges with twenty-four equivalent AgMg4Ag8 cuboctahedra, faces with six equivalent MgAg12 cuboctahedra, and faces with twelve equivalent AgMg4Ag8 cuboctahedra. All Mg–Ag bond lengths are 2.95 Å. Ag is bonded to four equivalent Mg and eight equivalent Ag atoms to form distorted AgMg4Ag8 cuboctahedra that share corners with twelve equivalent AgMg4Ag8 cuboctahedra, edges with eight equivalent MgAg12 cuboctahedra, edges with sixteen equivalent AgMg4Ag8 cuboctahedra, faces with four equivalent MgAg12 cuboctahedra, and faces with fourteen equivalent AgMg4Ag8 cuboctahedra. All Ag–Ag bond lengths are 2.95 Å.