Title page for etd-0623114-174314


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URN etd-0623114-174314
Author Jyun-lin Li
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2013
Semester 2
Degree Ph.D.
Type of Document
Language zh-TW.Big5 Chinese
Title The Study of Phase Diagram, Diffusion Path and Diffusivities in Au-Al-Cu and Au-Al-Pd Systems Using Diffusion Couple Method
Date of Defense 2014-06-17
Page Count 158
Keyword
  • diffusion couple
  • phase diagram
  • average interdiffusion coefficients
  • Au-Al-Cu
  • Au-Al-Pd
  • Abstract Diffusion couples and equilibrated alloys were used to construct the isothermal phase diagrams of Au-Al-Cu and Au-Al-Pd at 500 °C. Electron microprobe analyses were performed to determine the phase compositions and phase relationships. Two ternary phases (ε and β)and 10 three-phase equilibria were determined in Au-Al-Cu system. The δ(Au2Al) phase exhibited a wide range of solubility and a peculiar morphology. The average interdiffusion coefficients of δ(Au2Al) phase obtained at 500 °C are:
    =(-1.47±0.10) ×10-8 cm2/sec  =(-1.46±0.09) ×10-8 cm2/sec
    =(1.47±0.09) ×10-8 cm2/sec  =(1.46±0.08) ×10-8 cm2/sec
    Two ternary phases (T1 and T2) and 13 three-phase equilibria were identified in Au-Al-Pd system. Phase T1 contained 37 at% Au, 26 at% Pd, and 37 at% Al. Phase T2 contained 44 at% Au, 24 at% Pd, and 32 at% Al. The average interdiffusion coefficients of Au2Al phase obtained at 500 °C are:
    =(-2.75±0.04) ×10-10 cm2/sec =(-5.02±0.04) ×10-10 cm2/sec
    =(2.33±0.03) ×10-10 cm2/sec  =(4.74±0.03) ×10-10 cm2/sec
    The solubility ranges of the binary intermetallic phases were also determined in this study.
    Advisory Committee
  • Der- shin Gan - chair
  • H.-J. Wu - co-chair
  • P. Shen - co-chair
  • Yung-Chung Chen - co-chair
  • Ker-Chang Hsieh - advisor
  • Files
  • etd-0623114-174314.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2014-07-23

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