TY  - JOUR
AU  - Kim, Jin-Kyung
AU  - Jin, Lei
AU  - Sandlöbes, Stefanie
AU  - Raabe, Dierk
TI  - Diffusional-displacive transformation enables formation of long-period stacking order in magnesium
JO  - Scientific reports
VL  - 7
IS  - 1
SN  - 2045-2322
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2017-06813
SP  - 4046
PY  - 2017
AB  - Mg is the most important lightweight engineering alloy enabling future weight-reduced and fuel-saving engineering solutions. Yet, Mg is soft. Long-period stacking ordered (LPSO) structures in Mg alloys have unique crystal structures, characterized by both complex chemical and stacking order. They are essential for strengthening of Mg alloys. The formation mechanism of these LPSO structures is still under discussion. Here we report that Y/Zn enriched Guinier-Preston (GP) zones observed in a lean Mg-Y-Zn model alloy are precursors of early stage LPSO structures. We provide evidence of a new type of phase transformation mechanism which comprises the diffusional formation of Y/Zn enriched GP zones and their subsequent shear transformation into LPSO building blocks. The mechanism constitutes a new type of coupled diffusional-displacive phase formation sequence which may also be applicable to other alloy systems.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000403874900029
DO  - DOI:10.1038/s41598-017-04343-y
UR  - https://juser.fz-juelich.de/record/838095
ER  -