The influence of composition and processing conditions on the behaviour of metastable beta titanium alloys

由Ti和NiTi基合金中的马氏体相变驱动的功能部件为许多工程部门提供了巨大的潜在利益。然而，实现这一潜力的主要障碍之一是无法根据具体的操作条件调整转换行为。由于对合金化和微观结构条件的作用的不完全理解，再加上相应文献数据的显著变化，这些问题更加严重。该项目旨在通过开发一系列二元和三元钛基合金中转变的增强机理描述来解决这些问题。合金将通过电弧熔炼纯元素制造，通过冷轧加工并进行再结晶热处理。由此产生的微观结构的条件将其特征在于先进的电子显微镜，而在热和机械驱动的相变过程中发生的晶体学变化将使用原位同步辐射X-日衍射进行研究。

Functional components, driven by the martensitic transformation in Ti- and NiTi- based alloys, offer huge potential benefits to many engineering sectors. However, one of the key barriers to realising this potential has been the inability to tailor the transformation behaviour to specific operational conditions. This problems is exacerbated by an incomplete understanding of the role of alloying and microstructural condition, coupled with significant variations in corresponding literature data. This project seeks to address these issues by developing an enhanced mechanistic description of the transformation in a range of binary and ternary Ti- based alloys. Alloys will be fabricated by arc melting pure elements, processed by cold rolling and subjected to recrystallisation heat treatments. The resulting microstructural condition will be characterised by advanced electron microscopy whilst the crystallographic changes that occur during thermally and mechanically driven phase transformations will be studied using in situ synchrotron X-day diffraction.