Title page for etd-0709117-125742


[Back to Results | New Search]

URN etd-0709117-125742
Author Ya-Yun Lin
Author's Email Address No Public.
Statistics This thesis had been viewed 5353 times. Download 0 times.
Department Materials and Optoelectronic Science
Year 2017
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Ti-Au-Pd 800°C Phase Diagram Study
Date of Defense 2017-07-21
Page Count 90
Keyword
  • diffusion couple
  • Ti
  • Au
  • Pd
  • phase diagram
  • Abstract Titanium alloy has excellent mechanical properties, thermal properties and biocompatibility, it has been applied as aerospace materials and biomaterials. According to the literature, Ti-Au alloy and Ti-Pd alloy can improve the mechanical and corrosion properties. The study of Ti-Au-Pd ternary phase diagram could provide the information of titanium alloy design.
    In this study, the diffusion couple technique applied to determine the diffusion path that will provide the information of two-phase equilibrium and three-phase equilibrium. Then, the traditional alloy equilibrium technique applied to verify the three-phase equilibrium and those regions that the diffusion paths did not through it. This could the cost of gold and palladium. The diffusion couples and alloy specimens are sealed in a vacuum quartz tube and annealed at 800℃ for one day and 21 days, respectively. The diffusion couple and alloy samples were examined by electronic-probe- micro-analyzer (EPMA) to determine the equilibrium phase composition. 
    There are eight three-phase equilibrium as, (1)αTi-βTi-Ti3(Au,Pd)、(2)Ti3(Au,Pd)-Ti2Pd-Ti(Au,Pd)、(3)Ti(Au,Pd)-Ti2Pd3-Ti(Au,Pd)2、(4)Ti2Pd3-Ti(Au,Pd)2-Ti3Pd5、(5)Ti(Au,Pd)2-TiAu4-T、(6)Ti(Au,Pd)2-T-TiPd3、(7)TiAu4-T-(Au,Pd)、(8)T-(Au,Pd)-TiPd3 and twenty two-phase equilibrium determined in this study. There are three complete solid solution phases: Ti3Au-Ti3Pd, TiAu-TiPd and TiAu2-TiPd2. One ternary phase (Ti25Au25Pd50) was discovered with the composition range:22.3 at%~26.1 at% Ti、23.3 at%~32.4 at% Au、43.1 at%~58.0 at% Pd. The other determined solubility range are, 17.6 at% Au in Ti2Pd, 8.76 at% Au in Ti2Pd3, 10.0 at%Au in TiPd3 and 36.1 at% Pd in TiAu4.
    Advisory Committee
  • Liu-wen Chang - chair
  • Lung-chuan Tsao - co-chair
  • Ker-chang Hsieh - advisor
  • Files
  • etd-0709117-125742.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2017-08-09

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys