Diffusion Bonding Titanium Alloys to Stainless Steels

背景资料：现代可持续社会的先进工程部件不仅需要更好的材料，还需要新的连接或焊接工艺。下一代核反应堆出现的一个关键主题是开发用于连接异种合金的改进方法。由于熔焊工艺中固有的高温，使用这些方法来连接某些不同的合金，例如钛和不锈钢，已被证明是不成功的。镓辅助扩散焊是一种屡获殊荣的新方法，由提案人（PI）发明，用于连接无法使用传统工艺焊接的先进合金和复合材料。以前的结果：在EPSRC的印度-英国民用核方案研究项目“联合”（EP/I 01215 X/1号赠款）下进行的研究成果证明是非常有前途的。钛和不锈钢之间的高强度接头是使用镓辅助扩散焊接以及活性钎焊工艺生产的，英国和印度合作伙伴发表了几篇联合论文。拟议研究：将研究采用镓辅助扩散连接工艺制造的钛与不锈钢接头的质量，其中工艺条件系统地变化。这将允许结合条件针对强度和完整性进行优化。粘合样品将在印度进行仔细的微观结构表征，较大的样品将用于机械测试。研究方案的结果将发表在同行评审的期刊上。

Background: Advanced engineering components for modern sustainable society require not only better materials but also new joining or welding processes. A critical topic for the advent of the next generation of nuclear reactors is the development of improved methods for joining dissimilar alloys. Due to the high temperatures inherent in fusion welding processes, the use of these methods for joining certain dissimilar alloys, e.g. Titanium and Stainless Steels, has proved unsuccessful. Gallium-assisted diffusion bonding is an award-winning new method, invented by the proposer (PI), for joining the advanced alloys and composites that cannot be welded using conventional processes. Previous results: The outcome of research carried out under the EPSRC's Indo-UK Civil Nuclear Programme research project "JOINT" (Grant EP/I01215X/1) has proved very promising. High strength joints between Titanium and Stainless Steels were produced using gallium-assisted diffusion bonding as well as active brazing processes leading to publication of several joint papers by the UK and India partners. Proposed research: The quality of Titanium to Stainless Steel joints made using Gallium-assisted diffusion bonding processes will be studied where the process conditions are systematically varied. This will allow the bonding conditions to be optimised for strength and integrity. The bonded samples will be subjected to careful microstructural characterisation in India and larger samples made for mechanical testing. Results from the research programme will be published in peer-reviewed journals.