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Diffusional-displacive transformation enables formation of long-period stacking order in magnesium

Title
Diffusional-displacive transformation enables formation of long-period stacking order in magnesium
Author
김진경
Keywords
GUINIER-PRESTON ZONES; Y-ZN ALLOYS; TRANSMISSION ELECTRON-MICROSCOPY; MECHANICAL-PROPERTIES; BUILDING-BLOCK; CU ALLOY; GP-ZONES; MG; PHASE; PRECIPITATION
Issue Date
2017-12
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 7, Article no. 4046
Abstract
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.
URI
https://www.nature.com/articles/s41598-017-04343-yhttps://repository.hanyang.ac.kr/handle/20.500.11754/99221
ISSN
2045-2322
DOI
10.1038/s41598-017-04343-y
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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