کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5357598 1503637 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cross-sectional TEM analysis of structural phase states in TiNi alloy treated by a low-energy high-current pulsed electron beam
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Cross-sectional TEM analysis of structural phase states in TiNi alloy treated by a low-energy high-current pulsed electron beam
چکیده انگلیسی
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/cm2, 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 Å, c = 3.033-3.063 Å and α = 89.3-90°, β = γ = 90°, quasihomogeneous chemical composition corresponding to Ti51.7Ni48.3, 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 327, 1 February 2015, Pages 321-326
نویسندگان
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