Microstructural refining mechanisms and mechanical properties optimization in high toughness multi-principal element alloys

• Grant number: 21/04302-8
• Support Opportunities: Regular Research Grants
• Start date: October 01, 2021
• End date: November 30, 2023
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Francisco Gil Coury
• Grantee: Francisco Gil Coury
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated researchers: Eric Marchezini Mazzer ; Guilherme Yuuki Koga ; Guilherme Zepon ; Julian Arnaldo Avila Diaz ; Witor Wolf

Abstract

Multi-Principal Element Alloys (MPEAs) are metallic alloys that do not have a single main element which yields an immense number of possible compositions. Despite this, several alloys with interesting sets of properties have already been found. The featured compositions include those of the Cr-Co-Ni system, which are among the toughest materials ever developed, which can be attributed to the various strengthening and deformation mechanisms active in this material when mechanically deformed. The objective of the present project is to optimize the mechanical properties of the Cr-Co-Ni system alloys already identified as promising in previous work by the proponent. This search for optimization will take place on three different fronts: (1) Additions of substitutional elements capable of increasing the intrinsic mechanical strength of the alloy, (2) search for effective interstitial elements effective in microstructural refining via reduction of recrystallization and grain growth kinetics and (3) incorporation of a precipitation hardening mechanism by fine, dispersed and ordered phases with high resistance to dislocation shearing. An initial step will be dedicated to the design of alloys using a combination of different computational methods. The alloys will then be produced and characterized by different techniques. The most promising compositions will be subjected to mechanical tests of tension and impact to evaluate the mechanical properties under different loading conditions. Deformed samples will also be characterized to correlate the deformation mechanisms operating in these alloys with their mechanical properties. (AU)

Scientific publications

(7)

(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)

PUOSSO, FERNANDA CUNHA; BERTOLI, GUSTAVO; COURY, FRANCISCO GIL. A Hall-Petch study of the high toughness Cr40Co30Ni30 multi-principal element alloy. Journal of Materials Research, v. N/A, p. 13-pg., 2022-10-04. (21/04302-8, 19/21133-5, 21/05408-4)

FERNANDES OLIVEIRA, PEDRO HENRIQUE; SIQUEIRA MANCILHA, PEDRO HENRIQUE; VALENZUELA REYES, RODRIGO ANDRE; DE GOUVEIA, GUILHERME LISBOA; BOLFARINI, CLAUDEMIRO; SPINELLI, JOSE EDUARDO; COURY, FRANCISCO GIL. Influence of the cooling rate on the solidification path and microstructure of a AlCoCrFeNi2.1 alloy. MATERIALS CHARACTERIZATION, v. 203, p. 13-pg., 2023-06-29. (21/04302-8, 21/12589-5, 22/02770-7)

COURY, FRANCISCO G.; ZEPON, GUILHERME; BOLFARINI, CLAUDEMIRO. Multi-principal element alloys from the CrCoNi family: outlook and perspectives. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 15, p. 3461-3480, NOV-DEC 2021. (21/04302-8)

KOGA, G. Y.; NASCIMENTO, A. R. C.; ETTOUIL, F. B.; RODRIGUES, L. C. M.; ZEPON, G.; BOLFARINI, C.; KIMINAMI, C. S.; BOTTA, W. J.; SCHULZ, R.; SILVA, A. COSTA E; et al. Thermally sprayed multi-principal element Cr40Co40Ni20 coatings - Oxidation upon coatings' build-up and electrochemical corrosion. SURFACE & COATINGS TECHNOLOGY, v. 454, p. 16-pg., 2022-12-26. (21/04302-8, 21/08514-0)

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)

LOPES, JOAO G.; ROCHA, P.; SANTANA, D. A.; SHEN, JIAJIA; MAAWAD, E.; SCHELL, N.; COURY, F. G.; OLIVEIRA, JOAO P.. Impact of Arc-Based Welding on the Microstructure Evolution and Mechanical Properties in Newly Developed Cr29.7Co29.7Ni35.4Al4Ti1.2 Multi-Principal Element Alloy. ADVANCED ENGINEERING MATERIALS, v. 25, n. 13, p. 17-pg., 2023-05-03. (21/04302-8)