强流脉冲离子束辐照对钛合金表面相结构的影响

利用X射线衍射(XRD)和能量色散的特征X射线谱(XEDS)扫描,对强脉冲离子束辐照钛合金的表面结构特征和成分分布进行了测试与分析。结果表明,试样钛合金为(α+β)型两相钛合金。当以低能流密度离子束辐照时,材料表面粗糙度的增加导致结构发生明显变化;随着离子束能流密度的增加,材料表面层出现微小非晶相;表面元素呈明显的层状均匀分布;多次脉冲离子束辐照下,表面形成Al2O3等氧化物,从而利于被辐照表面抗氧化性的提高。进一步提高离子束能流密度,多次脉冲辐照,材料表面形成了新相Al6MoTi和AlMoTi2。

Study on the surface phase transformation of Ti based alloy irradiated by intense pulsed ion beams

The surface phase transformation and compositions distribution of Ti based alloy irradiated by intense pulsed ion beams were investigated by X-rays diffraction （XRD） and energy dispersive spectrometry line scanning （XEDS） respectively. The results show that the un-irradiated sample mainly is composed of α-Ti and β-Ti. The diffraction peaks of surface composition disappear while its roughness increases when the target irradiated by intense pulsed ion beam with a low energy density. The minor amorphous phase has been formed when the target is irradiated by IPIB with a moderate energy density. With many pulses,the increasing of Al and O elements has been found and it means that the formation of Al2O3,which is favorable for the anti-oxidation improvement of Ti based alloy surface. With further increasing of energy density,two new phases-Al6MoTi and AlMoTi2 appeared on the irradiated surface of target.