Title page for etd-0716116-235714


[Back to Results | New Search]

URN etd-0716116-235714
Author Yu-you Chen
Author's Email Address No Public.
Statistics This thesis had been viewed 5356 times. Download 0 times.
Department Materials and Optoelectronic Science
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Ti-Cu-Ni and Ti-Ag-Pd 800oC phase diagrams study
Date of Defense 2016-07-28
Page Count 104
Keyword
  • Ti-Ag-Pd
  • diffusion couple
  • EPMA
  • Ti-Cu-Ni
  • phase diagram
  • Abstract This study is to investigate the Ti-Cu-Ni and Ti-Ag-Pd 800oC isothermal phase diagram. Both the diffusion couple and the equilibrated alloys methods are applied to determine the equilibrium phase diagrams.
    In this experiment, the specimens were prepared by an electric arc furnace. then seal in a vacuum quartz tube, after high temperature heat treatment and metallurgical treatment, using electronic micro-finder (EPMA) to analysis the equilibrium phase composition.
    There are ten three-phase equilibrium In Ti-Cu-Ni 800oC equilibrium phase diagram, as follows (1) βTi-Ti2Cu-Ti2Ni, (2) Ti2Cu-Ti2Ni-TiNi, (3) Ti2Cu-TiCu- TiNi, (4) TiNi-T2-T1, (5) TiCu-TiNi-Ti3Cu4, (6) TiNi-Ti3Cu4-T1, (7) Ti3Cu4-Ti2Cu3-T1, (8) T2- T1-TiNi3, (9) T1- T4- (Ni, Cu), and (10) T1- βTiCu4 - (Ni, Cu). Besides, the Ti2Ni-TiNi-T1 three-phase equilibrium found in Ti-Cu-Ni diffusion couple experiment and this was a metastable equilibrium according to the results of the equilibrated alloy experiments.
    In the Ti-Ag-Pd system, it is difficult to discuss the diffusion path since the extremely different diffusion rate between Ti/Ag and Ti/Pd. We found that Ti and Pd preferentially reacts to form intermetallic phases, and the intermetallic phases of Ti-Ag are difficult to form. Also, there has another problem that Ag segregation in the alloy preparation by using Arc-melter. There is only Ti-rich part of the phase diagram as two three phase equilibrium αTi-PdTi3-PdTi2 and βPdTi-Pd3Ti2-αPd2Ti determined in Ti-Ag-Pd phase diagram, Ag solubility in PdTi3 Phase is 5.62 at.%, Ag solubility in PdTi2 Phase is 13.47 at.%, Ag solubility in αPd2Ti Phase is 6.70 at.%.
    Advisory Committee
  • H.-J. Wu - chair
  • Lung-Chuan Tsao - co-chair
  • Ker-Chang Hsieh - advisor
  • Files
  • etd-0716116-235714.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-08-17

    [Back to Results | New Search]


    Browse | Search All Available ETDs

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