caa a22 4500 38801864X CHVBK 20180307124917.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1557/JMR.1998.0199 doi S0884291400044356 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0199 Occurrence of plastic instabilities in dynamic microhardness testing [Elektronische Daten] Plastic instabilities were observed to appear during dynamic ultramicrohardness testing of a solid solution Al-3.3 wt.% Mg alloy. The tests were carried out at room temperature with a Vickers hardness indenter in a computer-controlled dynamic ultramicrohardness testing machine. During the tests the applied load was increased from 0 to 2000 mN at constant loading rate. The instabilities appear as characteristic steps in the continuously recorded load-indentation depth curves. The physical basis for the occurrence of the instabilities is the interaction between moving dislocations and solute atoms, a phenomenon termed in the literature as serrated yielding, jerky flow, or Portevin-Le Châtelier effect. The instabilities start at a critical load, Fc, in the depth-load curve. Varying the loading rate, μ, by two orders of magnitude Fc was found to increase linearly with the loading rate. Copyright © Materials Research Society 1998 Bérces G. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary Chinh N. Q. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary Juháasz A. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary Lendvai J. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary Journal of Materials Research Cambridge University Press 13/6(1998-06), 1411-1413 0884-2914 13:6<1411 1998 13 JMR https://doi.org/10.1557/JMR.1998.0199 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0199 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bérces G. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary NATIONALLICENCE 700 1- Chinh N. Q. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary NATIONALLICENCE 700 1- Juháasz A. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary NATIONALLICENCE 700 1- Lendvai J. Department of General Physics, Eötvös University, Budapest, H-1088 Múzeum krt. 6-8, Budapest, Hungary NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/6(1998-06), 1411-1413 0884-2914 13:6<1411 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge