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| The study on Ti alloys stress corrosion mechanicby recursion method |
| Liu Guili |
| Engineering Mechanics Institute; Shenyang University of Technology; Shenyang 110023 |
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Cite this article:
Liu Guili. The study on Ti alloys stress corrosion mechanicby recursion method. Acta Metall Sin, 2007, 43(3): 249-253 .
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Abstract The atomic cluster models of αandβTi grains, edge dislocation in αgrains and the crack formed with edge dislocation accumulation were set up by computer simulation technique. The electronic structure (Fermi energy level, structure energy, environment sensitive embedding energies etc) of αTi grains, edge dislocation and the crack were calculated by using Recursion method. The effect of alloys element Mo and V on βphase atomic binding energy was calculated and analyzed. The results show that: H prone to gather on the edge dislocation and form H atomic group as the environment sensitive embedding energies is smaller when H is at the edge dislocation. It makes Ti alloys local harden and edge dislocation blocking and forming crack that the edge dislocation fix the H atomic group. As the Fermi energy of the crack tip is higher than that of other area, so the electron run to other area of the crack from the crack tip, which make the electric potential difference between the crack tip and the other area of the crack. The crack tip decomposes as anode under the electrolyte. The tensile force and H air pressure at the crack make the crack cleavage or stretch along grains boundaries, which facilitates the stress corrosion. The alloys element Mo and V can enhance Ti alloys stress corrosion resistance by catalyzingβphase which stops the crack expand in αTi.
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Received: 19 June 2006
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