Surface nitriding on Ti–6Al–4V alloy via friction stir processing method under nitrogen atmosphere
Surface nitriding on Ti–6Al–4V alloy via friction stir processing method under nitrogen atmosphere
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DOI：
10.1016/j.apsusc.2013.03.060
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发表时间：
2013-06
影响因子：
6.7
通讯作者：
B. Li;Yifu Shen;Weiye Hu
中科院分区：
文献类型：
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作者：
B. Li;Yifu Shen;Weiye Hu
采用固态搅拌摩擦工艺（FSP）对Ti-6Al-4V基体进行氮气氛下的表面渗氮。在优化的工艺条件下，成功地制备了致密、厚的渗氮层，并通过XRD、SEM和EDS等手段对其进行了详细分析。冠顶表面的外层薄层主要为TiN相，晶粒细小，尺寸为2-3μm。去除牙冠后，仍有150μm以上的氮化层，氮化层呈类复合结构。过渡层中含有大量细小、均匀分散的氮化物颗粒，并以一定的Ti（N）固溶体形式镶嵌在Ti基体中。上表面的显微硬度为~1105HV0.2。此外，还详细讨论了快速热化学反应、氮扩散和氮化物颗粒分散等形成机制。
The solid-state friction stir processing (FSP) was introduced to surface nitriding on Ti–6Al–4V substrate under nitrogen atmosphere. Under the optimized process conditions, a sound and thick nitriding layer was successfully prepared and detailed by XRD, SEM and EDS methods. The outer thin layer on the top surface crowns was mainly TiN phase with refined grains in size of 2–3μm. After removing the crowns, a more than 150μm thick nitriding layer was remained with a composite-like structure. The transition layer contained numerous fine and uniformly dispersive nitride particles embedded in the Ti matrix with a certain solid solution of Ti(N). The micro-hardness of the top surface was ~1105HV0.2. Furthermore, the formation mechanisms including rapid thermalchemical reaction, nitrogen diffusion and nitride particle dispersion were discussed in detail.