首頁 > 網路資源 > 大同大學數位論文系統

Title page for etd-0813104-132816


URN etd-0813104-132816 Statistics This thesis had been viewed 2865 times. Download 1204 times.
Author Ming Chiang
Author's Email Address g9107045@ms2.ttu.edu.tw
Department Materials Engineering
Year 2005 Semester 1
Degree Master Type of Document Master's Thesis
Language English Page Count 111
Title Improving the High Temperature Formability of AM60 and AM60-1RE Mg Alloys by Equal Channel Angular Extrusion
Keyword
  • rare metal
  • misch metal
  • ECAE
  • AM60
  • AM60
  • ECAE
  • misch metal
  • rare metal
  • Abstract Abstract:
       Severe deformation processing is an emerging method for refining the grain structure of conventional alloys to micron and submicron levels. As such, this study aims to explore the microstructural evolution and property change in two Mg alloy, namely the AM60 and AM60-1RE, by ECAE processing at 200 ℃ and 270 ℃. The effects of structure evolution and the formation of a dynamic stable grain structure by hot working on the high temperature tensile ductility of the Mg alloys were also examined in this study.
       The results showed that an improvement in the higher elevated temperature ductility in AM60 and AM60-1RE alloys was achieved by applying an ECAE processing to the Mg alloys. Grain refinement in the Mg alloys by ECAE at 200 ℃ was found much more effective than at 270 ℃. The fine-grained Mg alloys obtained by ECAE at 200 ℃ exhibit higher high temperature tensile ductility than Mg alloys with a coarser grain structure. A dynamically stable grain structure with a stable grain size was found in the Mg alloys subjected to hot working by ECAE as well as by tensile deformation. The stable grain structure was reached by a dynamic balance between “grain refining” and “grain coarsening” in the process of hot working.
    Advisor Committee
  • none - advisor
  • none - co-chair
  • none - co-chair
  • Files indicate access worldwide
    Date of Defense 2004-07-31 Date of Submission 2004-08-13


    Browse | Search All Available ETDs