| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: here is disclosed procedure for fabrication of high strength and wear resistant electro-technical items of chromium or chromium-zinc bronze with nano and sub-micro-crystal structure. According to the procedure source work pieces of bronze are subjected to multi-cycle equi-channel angular press forming at rate 0.4 mm/sec at room temperature and at total number of cycles facilitating reduction of average dimension of bronze grains to dimension of grain dopt, value of which is preliminary determined depending on composition of bronze in accordance with expression: dopt=4bG/(Ç(1-v)(â-âiÇè(b))), where b is Burgers vector, G is modulus of alloy shear, v is Poisson ratio, â is external applied stress, âiÇè(b) is internal stress from non-equilibrium borders of grains; further, the work pieces are annealed in air in one or two stages at temperature 75-450C during from 5 min to 200 hours with successive formation of electro-technical items out of them. ^ EFFECT: raised processability of fabrication at increased wear resistance and combination of strength and electric conductivity of work-pieces. ^ 3 cl, 2 dwg |
