论文标题
α-Ti中Al和Sn的晶体学排序
Crystallographic ordering of Al and Sn in α-Ti
论文作者
论文摘要
越来越多的关注正在向$α$$ _ 2 $ ti $ _3 $ _3 $ _3 $ _3 $（Al，sn）降水，这是由于其对滑动带形成，本地化的影响以及对喷气发动机钛对疲劳性能的影响，钛合金的$α$相位。但是，在TEM，中子衍射或原子探针分析中，很难观察到$α$$ _ 2 $降水的早期阶段。在这里，小角度X射线散射用于重新检查二进制Ti-Al和Ti-Sn合金中的相边界，其含量约为500 ppmw o。发现文献中的相位界限大约是正确的，在6.2 wt。％Al和16.9wt。％sn中，这有帮助Al as a a a a a a s a a s sn sn sn sn sn sn sn sn sn的使用效果，并效仿了sn sn sn的稳定性。但是，一旦考虑到$α$+$β$合金中的o含量和相位分区，这意味着应大大降低$ _ {eq} $限制，以使未来的合金设计限制。
Increasing attention is being paid to $α$$_2$ Ti$_3$(Al,Sn) precipitation from the $α$ phase of titanium alloys owing to its effect on slip band formation, localisation and the implications for fatigue performance in jet engine titanium. However, the early stages of $α$$_2$ precipitation have historically been difficult to observe in TEM, neutron diffraction or atom probe analysis. Here, small angle X-ray scattering is used to reexamine the phase boundary in binary Ti-Al and Ti-Sn alloys with around 500 ppmw O. It is found that the phase boundaries in the literature are approximately correct, at 6.2 wt.% Al and 16.9 wt.% Sn, and that this favours the use of Al as a solid solution strengthener over Sn for ambient temperature applications. However, once O content and phase partitioning in $α$+$β$ alloys are taken into account, this implies that Al$_{eq}$ limits for future alloy design of critical rotating parts should be lowered substantially.
