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利用SEM、EPMA和XRD等方法,研究了电子能量127 keV、脉冲宽度180 ns的强流脉冲电子束(IPEB)辐照WC-13Ni硬质合金表面形貌、元素分布以及表层相结构变化。结果表明:IPEB辐照使WC-Ni硬质合金表面发生快速重熔和烧蚀,形成具有“熔坑”特征的致密重熔表面形貌;同时,辐照表面发生元素重新再分布,导致简六方α-WC相向面心立方β-WC_(1-x)和简六方α-W_2C亚稳相转变;高能量密度34 J/cm~2辐照,硬质合金表层有石墨相析出;IPEB辐照过程中β-WC_(1-x)和α-W_2C亚稳相的形成不仅取决于纳秒级高能束照辐照的极速冷却过程,也与WC中C的反应烧蚀、共晶反应、β-WC_(1-x)分解相关。
The surface morphology, elemental distribution and surface phase structure of WC-13Ni cemented carbide irradiated by intense current pulsed electron beam (IPEB) with electron energy of 127 keV and pulse width of 180 ns were studied by means of SEM, EPMA and XRD. The results show that IPEB irradiation causes rapid remelting and ablation of the WC-Ni hard alloy surface, forming a dense remelted surface morphology with “crater” characteristics. At the same time, the redistribution of elements occurs on the irradiated surface, Resulting in metastable β-WC_ (1-x) and simple hexagonal α-W_2C metastable phase transitions between the hexagonal α-WC and the high energy density of 34 J / cm ~ 2. The formation of β-WC_ (1-x) and α-W_2C metastable phases during IPEB irradiation depends not only on the extremely rapid cooling process of nanosecond high-energy beam irradiation but also on the reaction ablation of C in WC, Reaction, β-WC_ (1-x) decomposition related.