Studies into the impact of mechanical activation on optimal sintering temperature of UFG heavy tungsten alloys

5th International Scientific Workshop on "Advanced Technologies of Materials Field-Assisted Consolidation"

Nokhrin, A.V.^1 ; Chuvil'Deev, V.N.^1 ; Boldin, M.S.^1 ; Sakharov, N.V.^1 ; Baranov, G.V.^2 ; Popov, A.A.^1 ; Lantcev, E.A.^1 ; Yu Belov, V.^2 ; Smirnova, E.S.^1

Lobachevsky State University of Nizhny Novgorod, 23 Gagarin Ave., Nizhny, Novgorod

603950, Russia^1

Russian Federal Nuclear Center, All-Russian Research Institute of Experimental Physics, 37 Mira Ave., Sarov, Nizhny Novgorod region

607188, Russia^2

关键词: Grinding bodies;    High mechanical properties;    Mechanical activation;    Non equilibrium;    Optimal sintering;    Sintering mechanism;    Spark plasma sintering method;    Ultra-fine-grained;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/218/1/012011/pdf
DOI  :  10.1088/1757-899X/218/1/012011

来源: IOP

【 摘 要 】

The paper dwells on the research conducted into sintering mechanisms, the structure and mechanical properties of ultrafine-grained heavy tungsten W-Ni-Fe alloys. The dependence of alloy density on temperature of sintering (Tsint) is found to be nonmonotonic with a maximum equivalent to the optimal sintering temperature. Studies also encompassed the impact that the size of tungsten particles may have on the optimal Tsint. An increase in time of mechanical activation (MA) and acceleration of grinding bodies accompanied by a decrease in alloy particle size and formation of non-equilibrium solid solutions is shown to reduce the optimal Tsintof alloys. High-energy MA and Spark Plasma Sintering methods were applied to obtain samples of tungsten alloys with high mechanical properties: macroelasticity limit of up to 2,250 MPa, yield strength of up to 2,500 MPa.