| Autor: |
Grigoreva, T. F., Kovaleva, S. A., Kvashnin, V. I., Petrova, S. A., Devyatkina, E. T., Vosmerikov, S. V., Zhornik, V. I., Vityaz, P. A., Lyakhov, N. Z. |
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| Zdroj: |
Physics of Metals & Metallography; Jan2023, Vol. 124 Issue 1, p58-64, 7p |
| Abstrakt: |
X-ray diffraction analysis and optical and electron microscopy have been used to study the effect of mechanical activation conditions of the Cu–12% Sn mixture with different Cu9Al4 modifier contents on the structure and phase composition and morphology of formed composites. The mechanochemical introduction of 10 wt % of the modifying additive into the matrix of mechanically synthesized tin bronze mainly results in the formation of a ternary Al0.05Cu0.9Sn0.05 solid solution of aluminum and tin in copper. In the case of the 20 wt % modifying additive, the final product contains a Cu0.9Sn0.1 tin solid solution in copper and Cu9Al4 intermetallics. Studies of the mechanical and tribological characteristics of the material prepared by sintering under a pressure showed that the intensity of wear of the material based on the Cu–12 wt % Sn mechanochemically synthesized bronze is insignificant lower than that of commercial bronze alloy CuSn10P; the coefficient of friction (f) decreases by ~1.3 times and the range of its values is sufficiently wide, f = 0.7–0.9. The modification of the Cu–12 wt % Sn mechanically synthesized bronze with the Cu9Al4 intermetallics allowed us to decrease the intensity of wear by 1.3 to 1.6 times and to substantially decrease the coefficient of friction (by 1.2 to 1.6 times). The stable value f = 0.5 is reached for the mechanically activated Cu‒12 wt % Sn + 20 wt % Cu9Al4 composition. The introduction of the intermetallics results in the increase in the microhardness of the alloys by 1.6 to 2 times (to Hμ = 2730 MPa) compared to those of CuSn10P and mechanically synthesized bronzes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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