Strengthening Mechanism of Tungsten Alloy

With the rapid development of science and technology and armor protection technology continues to improve, with a high density of tungsten alloy shells have become increasingly demanding, especially require both high strength and good toughness at ensuring high density premise. Therefore, how to enhance and improve the high-density tungsten alloy deformation of the enhanced strength and ductility is currently an important research direction.

Strengthening mechanisms are mainly tungsten alloy solid solution strengthening, dispersion strengthening, precipitation strengthening and interface strengthening and so on. There are solid solution strengthening elements Re, Mo, Nb, Ta, Ir and the like. Tungsten alloy Mo, Ta, Re, Nb, Hf, V, and Cr and other elements having the same w body centered cubic lattice; may be a solid solution in which w, but also to a certain extent, a solid solution in the binder phase , so as to achieve a solid solution strengthening tungsten heavy alloys, strengthening the role which the Hf largest, followed by Ta, Nb and re.

Enhanced dispersion strengthening, including direct and indirect strengthening, mainly from direct strengthen interaction of dislocations with dispersed particles, and indirectly strengthened mainly due to the high density of dislocations network composed of sub-grain interactions increase the strength of the alloy. Interface strengthening is to optimize the grain boundary (grain boundary strength to increase or decrease the impurities in the grain boundary segregation), and if the formation of a solid solution at the interface, the interface can enhance binding strength and to improve the material strength. Further, since having a good interface bonding phase is passed through the interface to the stress of the tungsten particles, which can effectively reduce the bearing capacity of the binder phase, the matrix phase and the adhesive coordinated deformation, reducing the occurrence of intergranular cracks, thereby improving strength of the material. Precipitation hardening methods to inhibit the precipitation phase precipitation hardening, precipitation hardening, and the second phase dispersion strengthening three kinds of tungsten. Inhibit the precipitation phase precipitation is an effective way to improve and enhance the performance of tungsten alloy, solid solution heat treatment process commonly used to avoid precipitation + quench phase precipitation, while suppressing impurity elements in the interface segregation in order to obtain relatively clean tungsten / matrix interface. In the W-Ni-Fe alloy of high density can be enhanced to add a small amount of Co relative to the base particles of tungsten wettability of the surface of the tungsten particles are more rounded, more conducive to plastic deformation of the alloy can enhance the tungsten particles and the matrix phase of the interfacial bond strength, thereby improving the strength and elongation of the alloy. Meanwhile, added Co, in the early phase sintering, iron and nickel to form preferentially with a low melting point, good mobility eutectic nicely promoting component atomic diffusion in the liquid phase, thus speeding up the process of liquid-phase sintering, refine the microstructure of the alloy.


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