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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM
  • Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
  • Structural characterization of mesoporous materials using SEM & TEM
  • Interface analysis between various oxides and metals through Cs-corrected (S)TEM
  • Resistive switching mechanism of graphene oxide thin films for RRAM application

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Factors affecting the grain refinement of extruded Mg-6Zn-0.5Zr alloy by Ca addition

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Title
Factors affecting the grain refinement of extruded Mg-6Zn-0.5Zr alloy by Ca addition
Author
Kim, BeomcheolHong, Chang HeeKim, Jong ChanLee, Si-YoungBaek, Soo-MinJeong, Hu YoungPark, Sung Soo
Issue Date
2020-10
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
SCRIPTA MATERIALIA, v.187, pp.24 - 29
Abstract
We report that the grain size of an extruded Mg-6Zn-0.5Zr alloy is significantly reduced by the addition of Ca. The grain size was reduced from 4.2 to 1.6 mu m by the addition of 0.2 wt% Ca, leading to an increase in the yield strength to as high as 65 MPa. Microstructural analysis indicated that adding Ca to the alloy results in the co-presence of MgZn2 and Ca2Mg6Zn3 particles within the alpha-Mg matrix and the co-segregation of Zn and Ca at the grain boundaries. The factors responsible for such remarkable changes in the microstructure and tensile properties are also discussed. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/47554
URL
https://www.sciencedirect.com/science/article/pii/S1359646220303481?via%3Dihub
DOI
10.1016/j.scriptamat.2020.06.001
ISSN
1359-6462
Appears in Collections:
UCRF_Journal Papers
MSE_Journal Papers
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