A comparative study of the microstructures and creep behavior of AE42 and AE44 die-casting alloys

S. M. Zhu, M. A. Gibson, J. F. Nie, M. A. Easton, Per Bakke

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

10 Citations (Scopus)

Abstract

It has been reported that the creep resistance of AE42 tends to deteriorate at temperatures above 150°C while AE44 exhibits much better creep performance at elevated temperatures. However, the relationship between microstructure and creep resistance in these Mg-Al-RE die-casting alloys has not been well understood. In the present work, the microstructures and creep behaviour of AE42 and AE44 die-casting alloys were investigated and compared. The creep tests were conducted at 175°C in a stress range of 75 - 110 MPa. The microstructures in the as-cast and aged conditions were characterised in detail by transmission electron microscopy (TEM). The correlation between creep resistance and microstructure suggests that the level of Al solute retained in the a-Mg matrix after die-casting is an important factor in influencing creep resistance, with high levels leading to the subsequent precipitation of Mg 17Al12 during creep and the deterioration of creep resistance.

Original languageEnglish
Title of host publicationMagnesium Technology 2008
Pages437-442
Number of pages6
Publication statusPublished - 30 Jun 2008
EventMagnesium Technology Symposium 2008 - New Orleans, United States of America
Duration: 9 Mar 200813 Mar 2008

Publication series

NameMagnesium Technology
ISSN (Print)1545-4150

Conference

ConferenceMagnesium Technology Symposium 2008
CountryUnited States of America
CityNew Orleans
Period9/03/0813/03/08

Keywords

  • Creep
  • Die casting
  • Mg-Al-RE alloy
  • Microstructure
  • Transmission electron microscopy

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