A comparative study of the role of Ag in microstructures and mechanical properties of Mg-Gd and Mg-Y alloys

Yu Zhang, Wei Rong, Yujuan Wu, Liming Peng, Jian-Feng Nie, Nick Birbilis

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

Mg-Gd and Mg-Y are two fundamental Mg alloy systems. Four alloys with a equi-concentration of total alloying elements: Mg-2.8Gd-0.1Zr (at%), Mg-2.4Gd-0.4Ag-0.1Zr (at%), Mg-2.8Y-0.1Zr (at%) and Mg-2.4Y-0.4Ag-0.1Zr (at%) were designed. The roles of Ag in the Mg-Gd and Mg-Y alloys were comparatively studied. The Ag addition enhances the age-hardening response of the Mg-2.4Gd-0.4Ag-0.1Zr due to a combined strengthening effect of the prismatic β′ and basal γ′′ precipitates. In contrast, the Mg-2.4Y-0.4Ag-0.1Zr exhibits a weakened age-hardening response in comparison with the Mg-2.8Y-0.1Zr, which is due to the formation of the basal γ′′ precipitates at the expense of the prismatic β′ precipitates. The Ag addition also promotes the formation of precipitation free zones (PFZs) along grain boundaries in both Mg-2.4Gd-0.4Ag-0.1Zr and Mg-2.4Y-0.4Ag-0.1Zr. The grain boundary PFZ is supposed to relax stress concentration to some extent during plastic deformation, which is beneficial to ductility. In summary, the Ag addition not only improves the tensile yield strength (YS) and ultimate tensile strength (UTS), but also improves the elongation of the Mg-2.4Gd-0.4Ag-0.1Zr. In comparison, the Ag addition in the Mg-2.4Y-0.4Ag-0.1Zr improves the UTS and elongation but reduces the YS in comparison with the Mg-2.8Y-0.1Zr. The results in this study suggest that Ag is more effective to strengthen Mg-Gd than Mg-Y alloys.

Original languageEnglish
Pages (from-to)609-622
Number of pages14
JournalMaterials Science and Engineering A
Volume731
DOIs
Publication statusPublished - 25 Jul 2018

Keywords

  • Fracture
  • HAADF-STEM
  • Mechanical properties
  • Mg alloys
  • Precipitation

Cite this

Zhang, Yu ; Rong, Wei ; Wu, Yujuan ; Peng, Liming ; Nie, Jian-Feng ; Birbilis, Nick. / A comparative study of the role of Ag in microstructures and mechanical properties of Mg-Gd and Mg-Y alloys. In: Materials Science and Engineering A. 2018 ; Vol. 731. pp. 609-622.
@article{bee6f58520084dd9a2223b5dc992ea9c,
title = "A comparative study of the role of Ag in microstructures and mechanical properties of Mg-Gd and Mg-Y alloys",
abstract = "Mg-Gd and Mg-Y are two fundamental Mg alloy systems. Four alloys with a equi-concentration of total alloying elements: Mg-2.8Gd-0.1Zr (at{\%}), Mg-2.4Gd-0.4Ag-0.1Zr (at{\%}), Mg-2.8Y-0.1Zr (at{\%}) and Mg-2.4Y-0.4Ag-0.1Zr (at{\%}) were designed. The roles of Ag in the Mg-Gd and Mg-Y alloys were comparatively studied. The Ag addition enhances the age-hardening response of the Mg-2.4Gd-0.4Ag-0.1Zr due to a combined strengthening effect of the prismatic β′ and basal γ′′ precipitates. In contrast, the Mg-2.4Y-0.4Ag-0.1Zr exhibits a weakened age-hardening response in comparison with the Mg-2.8Y-0.1Zr, which is due to the formation of the basal γ′′ precipitates at the expense of the prismatic β′ precipitates. The Ag addition also promotes the formation of precipitation free zones (PFZs) along grain boundaries in both Mg-2.4Gd-0.4Ag-0.1Zr and Mg-2.4Y-0.4Ag-0.1Zr. The grain boundary PFZ is supposed to relax stress concentration to some extent during plastic deformation, which is beneficial to ductility. In summary, the Ag addition not only improves the tensile yield strength (YS) and ultimate tensile strength (UTS), but also improves the elongation of the Mg-2.4Gd-0.4Ag-0.1Zr. In comparison, the Ag addition in the Mg-2.4Y-0.4Ag-0.1Zr improves the UTS and elongation but reduces the YS in comparison with the Mg-2.8Y-0.1Zr. The results in this study suggest that Ag is more effective to strengthen Mg-Gd than Mg-Y alloys.",
keywords = "Fracture, HAADF-STEM, Mechanical properties, Mg alloys, Precipitation",
author = "Yu Zhang and Wei Rong and Yujuan Wu and Liming Peng and Jian-Feng Nie and Nick Birbilis",
year = "2018",
month = "7",
day = "25",
doi = "10.1016/j.msea.2018.06.084",
language = "English",
volume = "731",
pages = "609--622",
journal = "Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

A comparative study of the role of Ag in microstructures and mechanical properties of Mg-Gd and Mg-Y alloys. / Zhang, Yu; Rong, Wei; Wu, Yujuan; Peng, Liming; Nie, Jian-Feng; Birbilis, Nick.

In: Materials Science and Engineering A, Vol. 731, 25.07.2018, p. 609-622.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - A comparative study of the role of Ag in microstructures and mechanical properties of Mg-Gd and Mg-Y alloys

AU - Zhang, Yu

AU - Rong, Wei

AU - Wu, Yujuan

AU - Peng, Liming

AU - Nie, Jian-Feng

AU - Birbilis, Nick

PY - 2018/7/25

Y1 - 2018/7/25

N2 - Mg-Gd and Mg-Y are two fundamental Mg alloy systems. Four alloys with a equi-concentration of total alloying elements: Mg-2.8Gd-0.1Zr (at%), Mg-2.4Gd-0.4Ag-0.1Zr (at%), Mg-2.8Y-0.1Zr (at%) and Mg-2.4Y-0.4Ag-0.1Zr (at%) were designed. The roles of Ag in the Mg-Gd and Mg-Y alloys were comparatively studied. The Ag addition enhances the age-hardening response of the Mg-2.4Gd-0.4Ag-0.1Zr due to a combined strengthening effect of the prismatic β′ and basal γ′′ precipitates. In contrast, the Mg-2.4Y-0.4Ag-0.1Zr exhibits a weakened age-hardening response in comparison with the Mg-2.8Y-0.1Zr, which is due to the formation of the basal γ′′ precipitates at the expense of the prismatic β′ precipitates. The Ag addition also promotes the formation of precipitation free zones (PFZs) along grain boundaries in both Mg-2.4Gd-0.4Ag-0.1Zr and Mg-2.4Y-0.4Ag-0.1Zr. The grain boundary PFZ is supposed to relax stress concentration to some extent during plastic deformation, which is beneficial to ductility. In summary, the Ag addition not only improves the tensile yield strength (YS) and ultimate tensile strength (UTS), but also improves the elongation of the Mg-2.4Gd-0.4Ag-0.1Zr. In comparison, the Ag addition in the Mg-2.4Y-0.4Ag-0.1Zr improves the UTS and elongation but reduces the YS in comparison with the Mg-2.8Y-0.1Zr. The results in this study suggest that Ag is more effective to strengthen Mg-Gd than Mg-Y alloys.

AB - Mg-Gd and Mg-Y are two fundamental Mg alloy systems. Four alloys with a equi-concentration of total alloying elements: Mg-2.8Gd-0.1Zr (at%), Mg-2.4Gd-0.4Ag-0.1Zr (at%), Mg-2.8Y-0.1Zr (at%) and Mg-2.4Y-0.4Ag-0.1Zr (at%) were designed. The roles of Ag in the Mg-Gd and Mg-Y alloys were comparatively studied. The Ag addition enhances the age-hardening response of the Mg-2.4Gd-0.4Ag-0.1Zr due to a combined strengthening effect of the prismatic β′ and basal γ′′ precipitates. In contrast, the Mg-2.4Y-0.4Ag-0.1Zr exhibits a weakened age-hardening response in comparison with the Mg-2.8Y-0.1Zr, which is due to the formation of the basal γ′′ precipitates at the expense of the prismatic β′ precipitates. The Ag addition also promotes the formation of precipitation free zones (PFZs) along grain boundaries in both Mg-2.4Gd-0.4Ag-0.1Zr and Mg-2.4Y-0.4Ag-0.1Zr. The grain boundary PFZ is supposed to relax stress concentration to some extent during plastic deformation, which is beneficial to ductility. In summary, the Ag addition not only improves the tensile yield strength (YS) and ultimate tensile strength (UTS), but also improves the elongation of the Mg-2.4Gd-0.4Ag-0.1Zr. In comparison, the Ag addition in the Mg-2.4Y-0.4Ag-0.1Zr improves the UTS and elongation but reduces the YS in comparison with the Mg-2.8Y-0.1Zr. The results in this study suggest that Ag is more effective to strengthen Mg-Gd than Mg-Y alloys.

KW - Fracture

KW - HAADF-STEM

KW - Mechanical properties

KW - Mg alloys

KW - Precipitation

UR - http://www.scopus.com/inward/record.url?scp=85049304487&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2018.06.084

DO - 10.1016/j.msea.2018.06.084

M3 - Article

VL - 731

SP - 609

EP - 622

JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -