Title page for etd-0213109-171554


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URN etd-0213109-171554
Author chih-ming Lai
Author's Email Address No Public.
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Department MSE
Year 2008
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Work hardening behavior of ultra fine grained commercially aluminum alloy containing nanoscale alumina dispersoids produced by friction stir processing
Date of Defense 2009-01-17
Page Count 88
Keyword
  • friction stir processing
  • Abstract Al-Al2O3 precipitated alloys and Al-Zn solid solution alloys fabricated by friction stir process are investigated in this study.
    The mechanical specimen cutting from stir zone were tested by Instron machine. Micro-structure was observed by Scanning Electron Microscopy and Transmission Electron Microscopy. Phase composition was measured by X-ray diffraction. Different Grain sizes sample were obtained at condition with constant traverse speed of 1.0mm/s, different RPM(500rpm, 550rpm, 700rpm, 1500rpm and 1500rpm with subsequent annealing treatment) and pin shape. Mechanical properties and ductility improvement on grain size effect are discussed in this research.
    In Al/Al2O3 composite materials, mechanical strength is enhanced by Al2O3 precipitation distributed homogeneously in Al matrix and ductility is improved simultaneously by increment of work hardening rate due to interaction between obstacles and dislocations.
    In Al-Zn solid solution alloys, ductility enhancement takes place not only in refining grain sizes but also occurs obviously with different weight fraction of Zn addition.
    Advisory Committee
  • Kao Po-We - chair
  • Chang Liu-wen - co-chair
  • Ho New-Jin - advisor
  • Files
  • etd-0213109-171554.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2009-02-13

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