Journal Article

FZJ-2022-00249

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Co-deformation between the metallic matrix and intermetallic phases in a creep-resistant Mg-3.68Al-3.8Ca alloy

Zubair, M. (Corresponding author)Extern*RWTH* ; Sandlöbes-Haut, S. ; Lipińska-Chwałek, M.RWTH*FZJ* ; Wollenweber, M. A.RWTH* ; Zehnder, C.RWTH* ; Mayer, J.FZJ*RWTH* ; Gibson, J. S. K. -L.RWTH* ; Korte-Kerzel, S.RWTH*

2021
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/30650  doi:10.1016/j.matdes.2021.110113

Abstract: 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.

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Contributing Institute(s):

1. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 5353 - Understanding the Structural and Functional Behavior of Solid State Systems (POF4-535) (POF4-535)
2. SFB-1394-A03 - Charakterisierung von Versetzungen und planaren Defekten (A03) (437411567) (437411567)
3. SFB 1394 A05 - Versetzungen in komplexen intermetallischen Phasen (A05) (437412665) (437412665)
4. Multiphysikbeschreibung von Mg-Kompositen auf Kornebene (C01) (437513708) (437513708)
5. SFB 1394 C02 - Ko-Verformung von (inter)metallischen Kompositen (C02) (437514011) (437514011)

Appears in the scientific report 2022

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