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Correlation between microstructure and mechanical properties of a quasicrystalline phase former alloy obtained by selective laser melting

Grant number: 18/04209-5
Support type:Scholarships in Brazil - Master
Effective date (Start): June 01, 2018
Effective date (End): February 29, 2020
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Piter Gargarella
Grantee:Aylanna Priscila Marques de Araújo
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys, AP.TEM
Associated scholarship(s):19/03010-3 - Selective laser melting of quasicrystalline phase former Al-based alloys, BE.EP.MS

Abstract

The precipitation of quasicrystalline phase in a ±-Al dendritic matrix provides Al-based alloys with high mechanical and wear resistance, mainly at high temperatures, which are promising for applications as molds and dies. However, to form the quasicrystalline phase, a high cooling rate must be applied during solidification (~ 103 K/s), which is usually only precipitated in powders and ribbons because their reduced thickness. Molds and dies generally present complex geometry, being fabricated through complex machining processes, with limited design possibilities. An alternative route to produce these dies and molds is using additive manufacturing, where the part is built layer by layer, which allows the production of molds with complex geometry and internal cooling system. Among the additive manufacturing processes there is the Selective Laser Melting (SLM). This process, besides allowing production of parts with complex geometries and customized density, also allows to achieve high cooling rates (up to 105K/s), which would allow, for example, to obtain quasicrystalline phases in Al-based alloys. Considering this, the present project aims to investigate the microstructure and phase formation of the quasicrystalline phase forming alloy Al91Fe4Cr3Ti2 obtained by the SLM and to investigate its mechanical properties at different temperatures. A detailed study will be done to understand the solidification of the part and dynamics of the process and how the microstructure affects the mechanical properties. Firstly, tests will be performed to find the most suitable parameters for samples production by SLM with the aim to obtain high relative density. The best combination of parameters will be used to produce samples that will be characterized with regard to their structure, thermal and mechanical stability by X-ray diffraction, differential scanning calorimetry, optical microscopy, scanning and transmission electron microscopy, mechanical tests tensile strength at different temperatures and hardness. The correlation between microstructure and phase formation, properties and process parameters will be investigated. (AU)