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中文摘要：
采用电子束物理气相沉积（EB-PVD）在单晶高温合金DD6基体上沉积NiCrAlYSi涂层。利用X射线衍射（XRD）、扫描电镜（SEM）、能谱仪（EDS）以及透射电镜（TEM）等研究了高温扩散过程中NiCrAlYSi/DD6的界面再结晶和互扩散行为。研究结果表明合金表面喷砂处理后的涂层试样经1 323K真空热处理4h后,在涂层/合金基体界面出现了厚度约为7μm的胞状再结晶区;表面未喷砂处理的涂层试样经过50h后没有出现再结晶,经过75h后形成了厚度约为15μm的再结晶区。在大气中静态氧化500h后,表面未喷砂处理试样在涂层/合金界面形成了厚度约为28μm的再结晶区,同时在合金基体中形成了厚度约60μm、以针状拓扑密堆相（TCP）为主的二次反应区（SRZ）,TCP中富含W、Re和Ta元素。
英文摘要：
In this paper,the NiCrAlYSi coatings are deposited by electron beam physical vapor deposition（EB-PVD） on nickel-based single crystal superalloy DD6.Inter-diffusion and recrystallization behaviors at the coating/superalloy interface of the coated superalloy substrates are investigated at 1 323 K by X-ray diffraction（XRD）,scanning electron microscopy（SEM） equipped with energy dispersive spectrometry（EDS） and transmission electron microscopy（TEM）.The results indicate that a recrystallization zone of ~7 μm thickness is formed at the coating/substrate interface of the blasted sample after 4 h vacuum heat-treatment at 1 323 K.Such recrystallization zone is not observed in the unblasted sample even after 50 h heat-treatment.However,a recrystallization zone of ~15 μm thickness is formed in the sample after 75 h.After 500 h isothermal oxidation in air at 1 323 K,a recrystallization zone of ~28 μm thickness is formed in the unblasted sample.Besides,a so-called secondary reaction zone of ~60 μm,basically consisting of topologically close-packed phase（TCP） needles,is formed in the superalloy.The precipitate of TCP is enriched in W,Re and Ta.
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