الفهرس | يوجد فقط 14 صفحة متاحة للعرض العام |
المستخلص The structural variations and mechanical properties of Al-Si based ternary alloys containing either Ag or Sn were studied for samples prepared form elements of purity 99.99%, homogenized at 823K for 53h and aged at 673K for 2h then quenched into iced water. The structural variations of all the tested alloys were studied by using (TEM) transmission electron microscope. The changes in the mechanical properties of the tested alloys were studied through : 1- tensile tests in the temperature range (413 – 493K). 2- applying the different values of : a) cyclic stress reduction σcy (0.87, 1.74, 2.6 and 3.48 MPa) at constant frequency υ = 0.38 Hz. b) frequency υ (0.18, 0.25, 0.33 and 0.38 Hz) at constant cyclic stress reduction σcy = 3.48 MPa. Softening behaviour was observed with increasing the working temperature, σRcyR and/or υ. The mechanical results were discussed according to the structure analysis of TEM micrographs. Sn addition improved the |