%0 Journal Article
%A Zubair, M.
%A Sandlöbes-Haut, S.
%A Lipińska-Chwałek, M.
%A Wollenweber, M. A.
%A Zehnder, C.
%A Mayer, J.
%A Gibson, J. S. K.-L.
%A Korte-Kerzel, S.
%T Co-deformation between the metallic matrix and intermetallic phases in a creep-resistant Mg-3.68Al-3.8Ca alloy
%J Materials and design
%V 210
%@ 0141-5530
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2022-00249
%P 110113
%D 2021
%X The microstructure of Mg-Al-Ca alloys consists of a hard intra- and intergranular eutectic Laves phase network embedded in a soft α-Mg matrix. For such heterogeneous microstructures, the mechanical response and co-deformation of both phases under external load are not yet fully understood. We therefore used nano- and microindentation in combination with electron microscopy to study the deformation behaviour of an Mg-3.68Al-3.8Ca alloy.We found that the hardness of the Mg2Ca phase was significantly larger than the α-Mg phase and stays constant within the measured temperature range. The strain rate sensitivity of the softer α-Mg phase and of the interfaces increased while activation volume decreased with temperature. The creep deformation of the Mg2Ca Laves phase was significantly lower than the α-Mg phase at 170 °C. Moreover, the deformation zone around and below microindents was dependant on the matrix orientation and was influenced by the presence of Laves phases. Most importantly, slip transfer from the α-Mg phase to the (Mg,Al)2Ca Laves phase occurred, carried by the basal planes. Based on the observed orientation relationship and active slip systems, a slip transfer mechanism from the soft α-Mg phase to the hard Laves phase is proposed. Further, we present implications for future alloy design strategies.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000706125700001
%R 10.1016/j.matdes.2021.110113
%U https://juser.fz-juelich.de/record/904933