high density tungsten alloy's performance has a close relationship with its fracture mode , the fracture mode of high density tungsten alloys are four kinds: W grain cleavage, W-W interfacial fracture, W- binder phase interfacial fracture, ductile binder phase tear . W-W interfacial bonding strength of the weakest, most likely to crack. With WW interface, increased interfacial fracture mode W- bond elongation decreased, tungsten alloy steering performance from ductile fracture of brittle fracture, with the W particle cleavage fracture mode and ductile binder phase was increased tearing, alloy strength and ductility increases.
High density tungsten alloy, W-phase volume fraction, W grain size, the intermetallic compound precipitated at the interface, as well as C, H, O, N, P, Si and other impurities in the alloy segregation interface failure mode are great impact. W phase volume increases, increased interfacial contact WW, W particles increases and the interface segregation will make WW interface and W- binder phase interfacial fracture increased fragility of the alloy. Vacuum dehydrogenation to eliminate hydrogen embrittlement, and other trace elements and add La use interface solution treatment to eliminate the segregation of impurities and intermediate compounds to avoid brittle phase formation, etc., will cause the W particle phase and binder phase interfacial bonding strength enhancement, W particles cleavage fracture increases alloy strength, ductility and fracture toughness is greatly improved.
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