Microstructure and mechanical properties of Mg-7.71Gd-2.39Nd-0.17Zr alloy after the different heat treatments

Shifeng Luo, Guangyu Yang, Lei Xiao, Wanqi Jie

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Microstructure and mechanical properties of Mg-7.71Gd-2.39Nd-0.17Zr alloy after different heat treatments were investigated. The microstructure of the as-cast alloy was composed of α-Mg matrix, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic, a little amount of small cuboid phase (GdH2) and Zr-rich cluster within α-Mg matrix. The optimal solution treatment was determined to be at 515 °C for 4 h. After solution treatment, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic was almost dissolved into α-Mg matrix and the grain size increased slightly. Furthermore, a large amount of GdH2was precipitated along the grain boundaries and within α-Mg matrix. After subsequent aging treatment at 200 °C for 32 h, Mg5Gd phases were precipitated along the grain boundaries. For the peak-aged alloy, the peak hardness of 105 HV was achieved and the ultimate tensile strength, yield strength and elongation at room temperature were up to 273.7, 188.2 MPa and 4.1%, respectively, which may be mainly attributed to the β″ and β′ phase precipitated within α-Mg matrix after ageing treatment.

Original languageEnglish
Title of host publicationMagnesium Technology 2018
EditorsKiran N. Solanki, Vineet Joshi, Neale R. Neelameggham, Dmytro Orlov
PublisherSpringer International Publishing
Pages237-243
Number of pages7
ISBN (Print)9783319723310
DOIs
StatePublished - 2018
EventInternational Symposium on Magnesium Technology, 2018 - Phoenix, United States
Duration: 11 Mar 201815 Mar 2018

Publication series

NameMinerals, Metals and Materials Series
VolumePart F7
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceInternational Symposium on Magnesium Technology, 2018
Country/TerritoryUnited States
CityPhoenix
Period11/03/1815/03/18

Keywords

  • Ageing-hardening
  • Mechanical properties
  • Mg–Gd–Nd–Zr alloy
  • Microstructure
  • Solution treatments

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