Mechanical and fatigue properties of Cu - Al - Win shape memory alloys with influence of mechanical cycling on amplitude dependence of internal friction at room temperature

摘要

The mechanical and fatigue properties of Cu - Al - Mn shape memory alloys with different phase fractions at room temperature were investigated. The specimens with differentchemical compositions (Al: 8,9 - 12 5 wt. % and Mn: 3 3- 93 wt. %) were tensile loaded with 10"3 s"1 tensile strain rate, Austenitic specimens have the highest tensile strength and fracture strain. Yield strength, tensile strength and elongation of martensitic alloys were lower compared withaustenitic alloys Fracture strain of martensitic alloys depend only little on the chemical composition Specimens of martensitic, austenitic and three different multiple phase specimens were tested in the high cycle fatigue range at room temperature The Woehler curves for multiple specimens depend on the phase fraction at testing temperatures. Different elements as Co, Ni, Fe and Si were alloyed to CuAll 1,6Mn5. All decreased the ductility of the specimens, and their fatigue properties.