Design, production and characterization of high mechanical strength precipitation-hardened high entropy alloys

• Grant number: 18/26390-3
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: June 01, 2019
• End date: March 31, 2023
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Francisco Gil Coury
• Grantee: Diego de Araujo Santana
• Host 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): 21/10997-9 - Assessing the high temperature mechanical behavior of new precipitation-hardened high entropy alloys and the effect of iron additions on the antiphase boundary energy of the Al-Ti-Cr-Co-Ni system, BE.EP.DR

Abstract

High Entropy Alloys (HEA) are a new class of metallic alloys that do not have a main element. This makes HEAs exist over a large compositional field, which is mostly unexplored. Recently, there is an increasing interest in high strength precipitation-hardened HEAs with Face Centered Cubic (FCC) matrix and L12 precipitates or Body Centered Cubic (BCC) matrix with B2 precipitates to compete with traditional superalloys. In this work, thermodynamic calculations will be performed to design HEAs with these structures. Eight alloys selected based on the thermodynamics predictions will be produced in pilot scale and they will be characterized to verify the presence of the expected precipitates. Two promising alloys will be used to study the precipitation process by means of several different heat treatments, characterization by different techniques, and hardness curves. Mechanical tests will be carried out in the different aging stages to verify the balance between strength and ductility. The analysis of the results will be made comparing the behavior of HEAs with conventional alloys seeking to understand if there are particularities in precipitation hardening in these alloys. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

BERTOLI, GUSTAVO; DE SOUSA, VITOR G. L.; SANTANA, DIEGO DE A.; OTANI, LUCAS B.; KIMINAMI, CLAUDIO S.; COURY, FRANCISCO G.. hase equilibria of VCrMnFeCo high entropy alloy. Journal of Alloys and Compounds, v. 903, MAY 15 2022. (19/07305-8, 21/04302-8, 18/26390-3)

SANTANA, DIEGO DE ARAUJO; KIMINAMI, CLAUDIO SHYINTI; COURY, FRANCISCO GIL. echanical properties and yield strength modeling of a medium entropy alloy containing L1(2) precipitate. Journal of Alloys and Compounds, v. 898, MAR 25 2022. (21/04302-8, 18/26390-3)