TY  - JOUR
AU  - Zubair, M.
AU  - Sandlöbes-Haut, S.
AU  - Lipińska-Chwałek, M.
AU  - Wollenweber, M. A.
AU  - Zehnder, C.
AU  - Mayer, J.
AU  - Gibson, J. S. K.-L.
AU  - Korte-Kerzel, S.
TI  - Co-deformation between the metallic matrix and intermetallic phases in a creep-resistant Mg-3.68Al-3.8Ca alloy
JO  - Materials and design
VL  - 210
SN  - 0141-5530
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2022-00249
SP  - 110113
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000706125700001
DO  - DOI:10.1016/j.matdes.2021.110113
UR  - https://juser.fz-juelich.de/record/904933
ER  -