Alloy strength

The difference in volume fraction of MC carbides and the nature of the residual phases are reflected in the mechanical and fracture test data. Yield strengths at all temperatures were nearly identical for both alloys in the standard STD A condition. This indicates that the intrinsic alloy strength, which is derived from precipitations of y and y" phases, was not influenced by carbides and other phases. Ductility, fracture toughness, and the FCGR were apparently strongly influenced by carbides and particularly by the Laves phases, which tended to precipitate in the grain boundaries. 

The minute particles, which a solid consists of, have the extraordinary quantum features. However, there is a gap between quantum theory on the one hand and engineering on the other hand. Even the principal notions and terms are different. The quantum physics operates with such notions as electron, nucleus, atom, energy, the electronic band structure, wave vector, wave function, Fermi surface, phonon, and so on. The objects in the engineering material science are crystal lattice, microstructure, grain size, alloy, strength, strain, wear properties, robustness, creep, fatigue, and so on. 

Lue] Luenenbuerger, A. Loehe, D. Macherauch, E., Elastic Deformation and Phase Transformation of a Metastable Bainitic-Austenitic Fe-C-Si-Alloy , Strength of Materials. Fundamental Physical Aspects of the Strength of Crystalline Materials. ICSMA 10. Proceedings of the 10 International Conference, Japan Inst. Metals., Sendai, Japan, 311-314, (1994) (Abstract)... 

Alloy Strength Strength Tensile Fracture Area... 

Plastic flow characteristics of polycrystalline a-Th containing 0.04 to 0.97 at% (600 ppm) N have been reported by McLachlan [6] and Peterson, McLachlan [11]. Tensile flow stresses at 1% strain, a, were measured at 4.2 to 800 K under conditions of constant flow rates, 5 x 10" to 10" s and creep strain rates of 10 and 10 s at constant stress. The N in solid solution increases the alloy strength and resistance to flow as measured by a, which can be resolved into two components as follows ... 

The major element used in these alloys is zinc. Additional elements are magnesium or magnesium plus copper, the use of which increases alloy strength. Alloys containing copper are among the strongest aluminum alloys and have been used as construction materials, primarily in aircraft applications. 

Strengths of this magnitude cannot be reached with beryllium free alloys. Strengths of up to 650 N/mm with an elongation (A5) > 10% make these materials appealing for less highly stressed parts because of the lower price. 

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