GOALI: A New Manufacturing Method for Low Cost High Performance Titanium

钛合金在重量轻得多的情况下却比钢更坚固。然而，钛广泛使用的最大障碍是其高昂的成本，其中很大一部分来自于高昂的加工成本。一种被称为氢烧结的新型粉末冶金工艺已经被引入，它可以生产出与通过锻造生产的标准钛部件的机械性能相竞争的钛部件，但成本只是后者的一小部分。这种新工艺对于大幅降低钛零件和组件的成本是非常有希望的。钛零件可用于许多应用（生物医学，化学加工，航空航天等），但对运输部门有特别的好处。通过减轻车辆的重量，将大大节省燃料消耗，并减少排放。该奖项支持对与钛粉工艺相关的基本冶金工艺的综合研究，以及通过不同工艺参数可以实现的机械性能。在这个研究项目中，pi将系统地研究通过几种热处理方案可以获得的机械性能范围，这些热处理方案已经显示出通过这种新型粉末冶金方法产生类似锻造的微观结构的能力。研究工艺参数对相关钛合金-氢体系相平衡的影响，以及随着热循环和氢分压的变化而发生的相变和微观组织演变，相变的机理和动力学，以及力学性能特别是疲劳性能对微观组织的依赖。通过研究这些关系，并将所获得的知识应用于以更低的成本最大化钛合金的强度、延展性和疲劳性能，将朝着实现钛对工业和社会的充分效益迈出重要的一步。

Titanium alloys can be stronger than steel at much lower weight. The greatest barrier to the widespread use of titanium, however, has been its high cost, much of which comes from high processing costs. A new powder metallurgy process called hydrogen sintering has been introduced that can produce titanium components with the capacity to compete with the mechanical properties of standard titanium parts produced by forging, but at a fraction of the cost. This new process is very promising for dramatically reducing the cost of titanium parts and components. Titanium parts can be used in many applications (biomedical, chemical processing, aerospace, etc.), but have particular benefit to the transportation sector. By reducing the weight of vehicles, significant savings in fuel consumption will be realized, as well as associated reductions in emissions. This award supports a comprehensive study of the fundamental underlying metallurgical processes associated with the titanium powder process, and the mechanical properties that can be achieved by varying process parameters. In this research program, the PIs will systematically study the range of mechanical properties that can be attained by several heat treating options that have already shown the capacity to produce wrought-like microstructures from this novel powder metallurgy approach. Processing parameters will be studied for their effects on phase equilibria in the relevant titanium alloy-hydrogen systems, as well as phase transformations and microstructural evolution as functions of thermal cycles and hydrogen partial pressures, the mechanisms and kinetics of the transformations, and the dependence of mechanical properties, especially the fatigue performance, on the microstructure. By studying these relationships and applying the knowledge gained toward maximizing the strength, ductility and fatigue properties of titanium alloys at substantially lower cost, a major step will be taken toward realizing the full benefit of titanium for industry and society.