Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Authors: Pereira, P.H.R., Wang, Y.C., Huang, Y. and Langdon, T.G.

Journal: Materials Science and Engineering: A

Volume: 685

Pages: 367-376

ISSN: 0921-5093

DOI: 10.1016/j.msea.2017.01.020

Abstract:

Experiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 µm and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10−4 to ~103 s−1. The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarse-grained material to superplasticity in the UFG alloy.

Source: Scopus

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Authors: Pereira, P.H.R., Wang, Y.C., Huang, Y. and Langdon, T.G.

Journal: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Volume: 685

Pages: 367-376

eISSN: 1873-4936

ISSN: 0921-5093

DOI: 10.1016/j.msea.2017.01.020

Source: Web of Science (Lite)