ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The mechanical and fatigue properties of Cu - Al - Mn shape memory alloys withdifferent phase fractions at room temperature were investigated. The specimens with differentchemical compositions (Al: 8.9 - 12.5 wt. % and Mn: 3.3 - 9.3 wt. %) were tensile loaded with 10-3s-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 chemicalcomposition. Specimens of martensitic, austenitic and three different multiple phase specimenswere tested in the high cycle fatigue range at room temperature. The Woehler curves for multiplespecimens depend on the phase fraction at testing temperatures. Different elements as Co, Ni, Feand Si were alloyed to CuAl11.6Mn5. All decreased the ductility of the specimens, and their fatigueproperties.Maxima could be detected in the strain amplitude dependence of damping for multiple phasespecimen. These maximum are shifted to lower damping and to higher strains with increasingnumber of mechanical cycles, compared to the as cast condition for not cycled specimen. The strainamplitude dependence of damping in martensitic and austenitic Cu – Al – Mn shape memory alloysdoes not change much during mechanical cycling
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.137.145.pdf
