Abstracts Book - IMRC 2018

• SE1-P009
INFLUENCE OF THE ADDITION OF Nd AND Ca ON DEFORMATION
MECHANISMS IN Mg-Zn ALLOYS
Changwan Ha 1 , Sangbong Yi 1 , Jan Bohlen 1 , Xiaohua Zhou 2 , Heinz-Günter Brokmeier 2 , Norbert
Schell 3 , Dietmar Letzig 1 , Karl Kainer 1
1 Helmholtz Zentrum Geesthacht, Magnesium Innovation Centre, Germany. 2 Technische
Universität Clausthal, Institute of Materials Science and Engineering, Germany. 3 Helmholtz
Zentrum Geesthacht, HZG Outstation at DESY, Germany.
The influence of Nd and Ca on the active deformation mechanisms is studied by
using in-situ synchrotron X-ray diffraction measurement under tensile load in
Mg-Zn sheets. The diffraction profiles collected during the deformation at
different temperatures are analysed, in order to evaluate the evolution of
dislocation density and the activities of three types of dislocations (a, c, and c+a
dislocations) by a convolutional multiple whole profile analysis, CMWP fitting
procedure. The experimental results indicate that the preferentially active
dislocation types and their density are influenced by alloying elements and
deformation temperature. A high preference of the dislocations is observed
during deformation, while the non-basal type dislocation was dominant
dislocation in Mg-Zn-Nd and Mg-Zn-Ca sheets. The different activities of the
basal , non-basal and pyramidal dislocations are discussed in relation with
the microstructure and texture developments in Mg-Zn-Nd and Mg-Zn-Ca
sheets.
Acknowledgment:
The authors are grateful to Dr. G. Farkas and Dr. K. Mathis in Charles University
for their intensive discussions on the CMWP fitting procedure as well as to Mr.
B. Schwebke at DESY and Mr. A. Reichart at HZG for technical supports. This
research was sponsored at Petra III at DESY for Synchrotron X-ray diffraction
experiments and funded by the Deutsche Forschungsgemeinschaft (Grants Bo
2461/4-1, Yi 103/2-1, and BR 961/7-1).
Keywords: Magnesium, in-situ synchrotron, CMWP
Presenting authors email: sangbong.yi@hzg.de