Cross-sectional TEM analysis of structural phase states in TiNi alloy treated by a low-energy high-current pulsed electron beam
| Autor: | N.N. Koval, V. O. Semin, A.A. Neiman, A.I. Lotkov, A.D. Teresov, Ludmila L. Meisner |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
сплавы
Materials science Alloy Analytical chemistry General Physics and Astronomy Pulse duration структурно-фазовые состояния Surfaces and Interfaces General Chemistry Electron engineering.material Condensed Matter Physics электронные пучки Surfaces Coatings and Films Crystallography Martensite Lattice (order) engineering Cathode ray Crystallite Chemical composition никелид титана |
| Zdroj: | Applied surface science. 2015. Vol. 327. P. 321-326 |
| ISSN: | 0169-4332 |
| Popis: | The paper reports on a study of structural phase states and their cross-sectional in-depth evolution from the surface of TiNi specimens treated by low-energy high-current electron beams with surface melting at a beam energy density E = 10 J/cm 2 , number of pulses N = 10, and pulse duration τ = 50 μs. After treatment, the modified TiNi surface zone takes on a layered structure in which each layer differs in phase composition and structural phase state. It is found that the melted layer is 8–10 μm thick. This layer is in a single-B2 phase state with distorted structure, lattice parameters a = b = 3.003–3.033 A, c = 3.033–3.063 A and α = 89.3–90°, β = γ = 90°, quasihomogeneous chemical composition corresponding to Ti 51.7 Ni 48.3 , the preferred orientations of the crystallites in a direction close to 〈4 1 0〉 B2 , and inhomogeneous lattice strain. The intermediate layer contains, in addition to the B2 phase, a B19′ martensite phase. The structural state of the B2 phase in this layer is close to equilibrium and its parameters approximate those of the initial B2 phase in nonirradiated TiNi specimens. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect