流脉冲离子束辐照对DZ4合金性能的影响
Effect on properties of alloy DZ4 irradiated by high intensity pulsed ion beam
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摘要: 用含Cn+和H+、加速电压250 kV、脉冲宽度70 ns、束流密度160 A/cm2的强流脉冲离子束辐照DZ4合金，辐照次数分别为2，5，10，15。实验结果表明：辐照后样品的表面出现了熔坑，多次脉冲辐照后样品的表面熔坑边缘模糊甚至消失。近表面存在厚1~2 mm的重熔层，晶粒较细，晶界模糊；熔坑周围富集Cr和Mo等元素;强流脉冲离子束辐照处理后DZ4合金的耐腐蚀性能明显提高，腐蚀速率下降,这是由于辐照减弱了由于晶界和晶粒本体的成分差异而引起的晶界腐蚀；同时离子束辐照后的DZ4合金在高温氧化时更容易形成一层连续的保护性氧化物，其主要成分是致密的Al2O3，使得DZ4合金的耐高温氧化性能也有所改善。Abstract: Surface irradiation of refractory alloy DZ4 is now realized by using high intensity pulsed ion beam(HIPIB) containing Cn+ and H+, where the accelerating voltage, pulse duration and current density were fixed at 250 kV, 70 ns and 160 A/cm2 respectively, while the treating pulses were chosen as 2, 5, 10 and 15 times. The morphologies of the samples are analyzed by SEM. Craters appear on the surface of DZ4 alloy after a few radiations, and disappear when irradiated for more times. According to cross-section SEM image, there is a remelting layer with depth of 1~2 mm on the surface of the irradiated samples, and the grains of the remelting layer are refined and the grain boundaries are blurry. The results of electron probe microanalysis demonstrate that there are plenty of Cr and Mo around the
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Key words:
- high intensity pulsed ion beam /
- alloy dz4 /
- corrosion resistance /
- oxidation resistance /
- irradiation
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