Hot tearing susceptibility of Mg-5Nd-xZn alloys

Research output: Contributions to collected editions/worksArticle in conference proceedingsResearchpeer-review

Authors

  • Francesco D'Elia
  • Domonkos Tolnai
  • Chamini Lakshi Mendis
  • Norbert Hort

Magnesium-neodynium-zinc (Mg-Nd-Zn) alloys are promising candidates as creep resistant alloys. Further, Nd is a rare earth (RE) addition with lower solid solubility and a relatively lower cost. Hence, the use of such alloys may result in a feasible and cost effective alternative for enhancing Mg alloy use in high temperature applications. Nevertheless, studies on the castability of Mg-Nd-Zn alloys are lacking. As such, the aim of this research was to investigate the hot tearing susceptibility of Mg-5Nd-xZn (x= 0, 3, 5, 7 wt%) alloys during permanent mold casting. Specifically, a constrained-rod casting mold equipped with a load cell was used to characterize hot tearing severity and determine the onset temperature of hot tearing. The onset solid fraction of hot tearing was subsequently determined via thermodynamic software. The results suggest that hot tearing severity increased initially with addition of Zn (up to 5 wt%), but then decreased with further addition to 7 wt%. This was likely attributed to both the low onset solid fraction of hot tearing (i.e. 0.5) recorded for this alloy, which enabled enhanced feeding and opportunity to heal developing hot tears, as well as the divorced eutectic structure observed which may have facilitated late stage feeding of eutectic liquid and hence limit the alloy's susceptibility to hot tearing.

Original languageEnglish
Title of host publicationMagnesium Technology 2016 - Held During TMS 2016 : 145th Annual Meeting and Exhibition
EditorsAlok Singh, Kiran Solanki, Michele Viola Manuel, Neale R. Neelameggham
Number of pages6
PublisherThe Minerals, Metals & Materials Society
Publication date2016
Pages129-134
ISBN (electronic)9781119225805
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event145th Annual Meeting and Exhibition of Magnesium Technology - TMS 2016 - Nashville, United States
Duration: 14.02.201618.02.2016
Conference number: 145

    Research areas

  • Hot tearing, Magnesium alloys, Microstructure, Solidification
  • Engineering