Title page for etd-0714100-101608


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URN etd-0714100-101608
Author Ru-Ying Huang
Author's Email Address m8736608@student.nsysu.edu.tw
Statistics This thesis had been viewed 5350 times. Download 2815 times.
Department Materials Science and Engineering
Year 1999
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Characterization of high energy beam welding of 6061/SiC aluminum matrix composites
Date of Defense 2000-06-28
Page Count 115
Keyword
  • aluminum matrix composite
  • laser beam
  • electron beam
  • wettability
  • cavity
  • microstructure
  • mechanical property
  • Abstract   The current thesis was designed to examine the welding characteristics of laser and electron beam
    welding of the superplastic metal matrix composites (MMCs) reinforced with 1~20% SiC and to
    differentiate the difference between the 6061 aluminum alloy and 6061/SiC composites.
    The 6061/20%SiCw MMC was found to exhibit poor welding characteristics under electron beam
    welding. This was because that the SiC whiskers would induce poor fluidity of molten Al matrix and
    the electron beam continuously bombared the MMC resulting in material loss through sputtering, and
    this effect induced an "V" groove formed at the center of the fusion zone. The laser beam welding of
    the 20% SiCw MMCs caused the decomposition of the SiCw into Al4C3 platelets at the center region
    of the fusion zone, as well as cavities along the outer region due to thermal expansion differences.
    The post-weld tensile test results showed that the brittle weld zone lead to the degradation of strength,
    and the 6061/20%SiCw MMC after welding would lose superplastic properties. There were some
    differences between the 6061 alloy and MMC upon subjected to laser beam welding. The absorption
    of laser energy by the MMC was better than that by the alloy; the absorption of laser energy increased
    with increasing SiC content. The shape of the reinforced material could also influence the quantity of
    Al4C3 formed. The total surface area of SiC particles was smaller than that of the SiC whiskers under
    equal volume fraction, therefore more SiC whiskers were decomposed. In the wetting experiment, the
    wettability and fluidity of molten material was observed to decrease with increasing SiC volume fraction
    at the same temperature. The wettability could be improved at higher temperatures. For the
    20%SiCw MMC, the wettability and fluidity could not be sufficiently improved even at a high
    temperature of 1300℃, which appeared to be the cause for the lack of feeding in the central fusion zone.
    Advisory Committee
  • N. J. Ho - chair
  • C. M. Cho - co-chair
  • J. C. Huang - advisor
  • Files
  • 完整論文.pdf
  • indicate access worldwide
    Date of Submission 2000-07-14

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