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Selective surface purification via crater eruption under pulsed electron beam irradiation
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Image of FIG. 1.
FIG. 1.

(Color online) Backscattered electron images of the untreated 316L (a) and NiTi (b) alloys. The line scan shown in the upper right inset in (b) confirms that the precipitates are the Ti-rich phase.

Image of FIG. 2.
FIG. 2.

(Color online) Secondary electron images [(a) and (e)] and their corresponding backscattered electron images [(b) and (f)] of the 316L [(a) and (b)] and NiTi (e, f) samples treated for five pulses. The line scans show that the black spots are remnants of MnS (in 316L) and (in NiTi). (c) shows a typical laser three dimensional morphology on the five pulse treated 316L sample and a line scan of relative height which crosses three craters. (d) is a scanning electron microscopy (SEM) image showing the typical aspect of a crater viewed on cross section (surface of the 316L sample treated for five pulses).

Image of FIG. 3.
FIG. 3.

(Color online) Evolutions of the density of (a) second phase inclusions and (b) craters on the surface of the 316L and NiTi samples as a function of the number of pulses.

Image of FIG. 4.
FIG. 4.

(Color online) Potentiodynamic polarization curves of the 20 pulse treated and untreated samples for (a) the 316L steel and (b) the NiTi alloy.


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Table I.

Physical parameters of AISI 316L, MnS, NiTi, and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Selective surface purification via crater eruption under pulsed electron beam irradiation