Tribotechnical properties modification of Al-Sn alloys by ECAP
The influence of ECAP on tribotechnical properties of Al-Sn alloys was investigated. It was established that their wear rate under dry friction on steel is reduced up to 18 ± 2% after pointed treatment while the friction coefficient does not depend on the ECAP numbers.
Recent Advances on Al-Sn Alloys with Ternary Alloying Elements
Al-Sn alloys are preferred for bearing materials where an excellent lubricity with proper wear resistance is necessary. In the current paper, the key issues and improvements of Al-Sn-X (X=Bi, Mg, Si, Cu, Pb) alloys are outlined. Effect of ternary alloying element (X) on microstructure, mechanical and tribological properties for Al-Sn alloys are reviewed in brief. Implementation and further development of Al-Sn-X alloys are to be underway.
Stability results for the solutions of some third and fourth order differential equations
SummaryThe paper investigates conditions under which solutions of the equations (1) and (2) of § 1.1 tend to zero as t → ∞.