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Title page for etd-0812108-142630


URN etd-0812108-142630 Statistics This thesis had been viewed 4738 times. Download 1083 times.
Author Yu-Jhih Ju
Author's Email Address No Public.
Department Materials Engineering
Year 2007 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 148
Title Improving the Elevated Temperature Mechanical
Properties of AZ91D Die Castings Mg alloy by Using a Precipitation Treatment
Keyword
  • Elevated Temperature Mechanical Properties
  • Elevated Temperature Mechanical Properties
  • Abstract This research aims to investigate the causes for the softening of AZ91D Mg alloy die castings and the aging treatment to improve the elevated temperature strength of the AZ91D die castings. The precipitation of Mg17Al12 intermetallic compound in the AZ91D Mg alloy was examined by using DSC, OM, SEM/EDS and XRD, and the effects of Mg17Al12 precipitation upon the mechanical properties of the Mg alloy was studied. The results showed that there are two causes for the softening of the AZ91D Mg alloy die castings; one due to the occurrence of elevated temperature annealing to soften the tension strengthened Mg die castings by releasing the residue stress, and the other caused by the coarsening of Mg17Al12 precipitates which somewhat like the effect of overaging. This study also concludes that, by applying an aging treatment to the AZ91D Mg alloy die castings, one may achieve the goal to avoid the elevated temperature softening in the alloy at temperatures up to 180℃.
    Advisor Committee
  • Chih-Fu Yang - advisor
  • none - co-chair
  • none - co-chair
  • none - co-chair
  • Files indicate accessible at a year
    Date of Defense 2008-07-29 Date of Submission 2008-08-12


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