Correlated nucleation of precipitates in magnesium alloy WE54

Hong Liu, Yipeng Gao, Yunzhi Wang, Jian-Feng Nie

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

Abstract

Magnesium alloy WE54 has been used commercially for fabricating components for aerospace and aircraft applications. Its useful mechanical properties are achieved via a precipitation process, β1 and β′ are the two strengthening precipitate phases when this alloy is peak-aged at 250°C. The β1 precipitate plates often form with β′ particles attached to their end facets. The aim of this study is to understand the correlated nucleation of the β1 and β′ phases. The equilibrium shapes of coherent β1 and β′ precipitates are simulated using the phase field method. The preferential nucleation site of a nucleating precipitate at the interface of pre-existing particle/Mg matrix is analyzed through the calculation of the elastic interaction energy between the nucleating precipitate and the pre-existing particle. The evolution sequence of the β1 and β′ phases are also simulated in this work. Our results indicate that the coherency elastic strain energy can be reduced significantly if a β′ particle forms at an edge facet of a pre-existing β1 plate, and that the preferred nucleation sites of the β′ particles are at the two end-facets of the β1 plate. Under the assumption that the β1 phase nucleates first, the microstructure evolution sequence is proposed in this work.

Original languageEnglish
Title of host publicationProceedings of the 1st World Congress on Integrated Computational Materials Engineering, ICME
Subtitle of host publicationSeven Springs, PA, USA; 10-14 July 2011
EditorsJohn Allison, Peter Collins, George Spanos
Place of PublicationHoboken NJ USA
PublisherJohn Wiley & Sons
Pages3-8
Number of pages6
ISBN (Electronic)9781118147726
ISBN (Print)9780470943199
Publication statusPublished - 2011
EventWorld Congress on Integrated Computational Materials Engineering (ICME) 2011 - Seven Springs, United States of America
Duration: 10 Jul 201114 Jul 2011
Conference number: 1st

Conference

ConferenceWorld Congress on Integrated Computational Materials Engineering (ICME) 2011
Abbreviated titleICME 2011
CountryUnited States of America
CitySeven Springs
Period10/07/1114/07/11

Keywords

  • Interaction energy
  • Magnesium alloys
  • Microstructure evolution
  • Phase field approach
  • Precipitation hardening

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