In Situ Investigation of Microstructure Evolution during Solidification of Mg10CaxGd (x=5, 10, 20) Alloys
C.L. Mendisa, D. Tolnai a, A. Stark b, N. Schell c, K.U. Kainer a and N. Hort a
aMagnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max Planck Str. 1, Geesthacht D-21502, Germany
bDepartment of Metal Physics, Helmholtz-Zentrum Geesthacht, Max Planck Str. 1, Geesthacht D-21502, Germany
cStructural Research on New Materials, Helmholtz-Zentrum Geesthacht, Outstation at DESY, Notkestr. 85, Hamburg D-22761, Germany
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Mg-Ca-Gd based alloys are investigated as a potential alloy for degradable biomaterials with some promising results. In this investigation the Mg10CaxGd (x=5, 10, 20) were investigated with synchrotron radiation X-ray diffraction during solidification to follow the phase evolution at two different cooling rates at 5 and 50 K min-1. All three alloys show formation of α -Mg followed by Mg2Ca phase, while only Mg10Ca20Gd alloy contained Mg5Gd phase during solidification. During cooling α -Mg was first observed between 628 and 632°C at a cooling rate of 5 K min-1 while this decreased to 620-628°C with the increase in cooling rate to 50 K min-1. The change in cooling rate from 5 to 50 K min-1 did not change the types of intermetallic phases observed but resulted in suppressing temperatures at which the intermetallic phases were first detected.

DOI: 10.12693/APhysPolA.128.606
PACS numbers: 81.05.Bx, 81.30.Fb