caa a22 4500 463226518 CHVBK 20180405153228.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-007-1631-9 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1631-9 Effect of natural ageing on the mechanical properties of molybdenum polycrystals [Elektronische Daten] [F. Bashir, M. Butt] Natural ageing of 99.95at.% Mo polycrystals annealed at 700°C influences its mechanical properties to a considerable extent. It is found that natural ageing for 6months reduces the ductility by about 70% whereas yield stress and ultimate tensile strength are decreased by about 20 and 18% respectively. The stress-relaxation rate measured at a given initial stress level at which deformation is interrupted to observe stress relaxation at constant strain, is faster in aged specimens compared with that in unaged ones. Similarly, the strain-rate sensitivity of flow stress for a given stress level is also increased on natural ageing. The rate process of stress relaxation and of plastic flow at rather high strains corresponding to the parabolic stage of work hardening appears to be vacancy migration. Springer Science+Business Media, LLC, 2007 Bashir F. Central Research Laboratory, Lahore College for Women University, 54000, Lahore, Pakistan aut Butt M. Central Research Laboratory, Lahore College for Women University, 54000, Lahore, Pakistan aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/18(2007-09-01), 7801-7805 0022-2461 42:18<7801 2007 42 10853 https://doi.org/10.1007/s10853-007-1631-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1631-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bashir F. Central Research Laboratory, Lahore College for Women University, 54000, Lahore, Pakistan aut NATIONALLICENCE 700 1- Butt M. Central Research Laboratory, Lahore College for Women University, 54000, Lahore, Pakistan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/18(2007-09-01), 7801-7805 0022-2461 42:18<7801 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer