Effect of mischmetal additions and solution heat treatments (T4) on the microstructure and mechanical properties of thixocast ZK60-RE magnesium alloys

Erenilton Pereira da Silva, Ricardo Henrique Buzolin, Bruna Callegari, Fernando Warchomicka, Guillermo C. Requena, Haroldo Cavalcanti Pinto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Solution treatments (T4) at 380 °C for 16 h and 500 °C for 8 h were performed for ZK60 magnesium alloys modified with addition of 0.5, 1.5 and 2.5 wt% of mischmetal (combination of rare-earth (RE) elements). The compression behaviour was investigated at room temperature and at 300 °C correlated with the microstructure and differential scanning calorimetry (DSC) data. The ascast microstructure is formed by -Mg matrix with globular grains reinforced by a semi continuous network of Mg-Zn, Mg-Zn-RE and Mg-RE intermetallic particles. Solution-treated alloys show lower yield strengths due to partial dissolution of precipitates. Work hardening was not observed for the alloys compressed at 300°C with the compression speed of 10-3 s-1, whereas it was observed for the compression speed of 10-2 s-1 for the all as-cast, ZK60-1.5RE-T4 at 380 °C and ZK60-1.5RE-T4 at 380 °C.

Original languageEnglish
Title of host publicationTHERMEC 2016
PublisherTrans Tech Publications Ltd.
Pages2300-2305
Number of pages6
ISBN (Print)9783035711295
DOIs
Publication statusPublished - 1 Jan 2017
Event9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016 - Graz, Austria
Duration: 29 May 20163 Jun 2016

Publication series

NameMaterials Science Forum
Volume879
ISSN (Print)0255-5476

Conference

Conference9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016
CountryAustria
CityGraz
Period29/05/163/06/16

Keywords

  • Casting
  • Magnesium
  • Mischmetal
  • Rare earths
  • Semi-Solid

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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