| Grant number: | 18/04564-0 |
| Support Opportunities: | Regular Research Grants |
| Start date: | December 01, 2018 |
| End date: | August 31, 2021 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering |
| Principal Investigator: | Juliano Soyama |
| Grantee: | Juliano Soyama |
| Host Institution: | Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil |
| City of the host institution: | Campinas |
| Associated researchers: | João Batista Fogagnolo |
| Associated research grant(s): | 24/07942-6 - PMTi Powder Metallurgy and Additive Manufacturing of Titanium, AR.EXT |
Abstract
High temperature materials are present in many common applications from automobiles and airplanes to heavy machinery found in petrochemical power plants and energy production. There is a wide range of materials that can be applied under combined conditions of mechanical loading and high temperatures, which include Ni-based superalloys, high temperature steels, molybdenum, niobium, cobalt and alloys, as well as intermetallics such as titanium aluminides. A great advantage of titanium aluminides over other competing alloys is their low density and thus high specific strength. However, processing of these intermetallics by conventional techniques is very challenging and typically expensive. Therefore alternative fabrication techniques such as powder metallurgy can offer several advantages in regard to processing. Powder metallurgy is able to provide fine and homogeneous microstructures that are segregation free. Additionally, a near-net shape condition can be achieved, which greatly decreases production costs. Nonetheless, powder metallurgy processing of titanium aluminides is not trivial and requires modifications to facilitate consolidation and sintering. One strategy is to add alloying elements that decrease sintering temperatures, e.g. Ni, Co, Fe, Zr, etc. In this case, a compromise between the beneficial effects in the sintering behavior and the formation of deleterious phases must be achieved. Furthermore, considering that quaternary or even more complex compositions are possible, the synergetic effects of alloying elements are difficult to predict without experimental work. Consequently, the investigation of alloying elements and the sintering behavior is mandatory for the development of powder metallurgy processed titanium aluminides. The objective of this research project is thus focused on the investigation of alloying elements that can aid sintering in the Ti-Al-Nb system using both conventional sintering and additive manufacturing technique (selective laser melting). (AU)
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