Effect of inclusions on cratering behavior in TiNi shape memory alloys irradiated with a low-energy, high-current electron beam
作者： L.L. Meisner , A.B. Markov , D.I. Proskurovsky , V.P. Rotshtein , G.E. Ozur
DOI: 10.1016/J.SURFCOAT.2016.06.036
关键词:
摘要: Abstract Irradiation of TiNi shape memory alloys with a microsecond low-energy (10–30 keV), high-current (10–25 kA) electron beam in surface melting modes induces microcrater formation, which limits the practical use this method modification. Potential centers crater formation are inclusions, inherent to alloys. However, there is limited information about their role and nature phenomenon as applied In paper, microstructural identification inclusions was carried out commercial (VIM) precision using TEM/SAED/EDS methods. The topographical features microcraters formed by single-pulse irradiation samples near threshold B2 matrix phase were identified. It found SEM/EDS-analysis, that mainly nucleated on titanium oxycarbide TiC(O) (commercial alloy) oxide Ti 4 Ni 2 O (precision inclusions; both cases, central region enriched oxygen. gradient capillary forces melt mass transfer (Marangoni effect), determine microcraters, analyzed. shown thermocapillary play an insignificant role, while chemicapillary induced decreasing tension due its oxygen enrichment can be sufficiently large produce microcraters.
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