Study of the growth of AlFe primary phases in Al alloys and of intermetallic layers in Sn-Bi-X/copper joints

• Grant number: 23/06107-3
• Support Opportunities: Regular Research Grants
• Start date: January 01, 2024
• End date: December 31, 2025
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: José Eduardo Spinelli
• Grantee: José Eduardo Spinelli
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated researchers: Aline Gonçalves Capella ; Bismarck Luiz Silva ; Carlos Alberto Della Rovere ; Conrado Ramos Moreira Afonso
• Associated scholarship(s): 24/03615-0 - Morphology, growth mode and properties of CuSn and AlFe intermetallics through advanced characterization techniques, BP.TT

Abstract

During recycling of Al alloys, the accumulation of residual impurities, Fe in particular, often leads to the formation of coarse intermetallic compounds during solidification that degrade the mechanical properties of the final product. Knowing the high cost associated with reducing the Fe content and/or using thermomechanical processing to reduce the intermetallics, it is preferable to manipulate the morphology, size and distribution during solidification. Therefore, advances related to the faceted growth of primary phases in Al-Fe alloys modified with Si, Ni and Mn are essential in refining the control of size, morphology and degree of anisotropy (aspect ratio) in different solidification conditions. The results obtained may be useful in the sense of generating morphologies that favor superior properties in Al alloys, enabling the production of alloys that are more tolerant to contamination with Fe, favoring recycling. Another challenge to be addressed in this project involves the growth of reaction layers in reflowed Sn-Bi alloys in copper pas, an increasingly important topic in the microelectronics industrial sector due to the trend towards miniaturization of soldered joints. Intermetallic layers produced under different exposure conditions and using different levels of Bi and alloying elements, In and Zn, will be examined in relation to their morphology, nature, growth direction and nanohardness. Solidification analyzes of the Sn-Bi-In and Sn-Bi-In-Zn alloys will be carried out through directional solidification experiments. The combination of characterization techniques such as SEM, XRD, EBSD, nanohardness and x-ray microtomography will allow understanding not only the formation and layer properties but also the solidification of these Sn-Bi alloys. The aim is to produce more stable, uniform, resistant layers with less Bi segregation. These same techniques will also be used in the mapping of AlFe intermetallics for the case of solidification of Al alloys with high Fe content. The development of these two research topics can result either in improvement of properties of alloys contaminated with Fe or in the improvement of the control of reaction layers in Sn-Bi-x/Cu joints. (AU)

Scientific publications

(8)

(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)

SPINELLI, JOSE E.; LEAL, JADERSON R.; WU, JOHN A.; LUKTUKE, AMEY; GANJU, ESHAN; CHAWLA, NIKHILESH. Long-Term Microstructural Stability of Sn-40Bi and Sn-40Bi-10In Alloys. JOURNAL OF ELECTRONIC MATERIALS, v. 53, n. 5, p. 12-pg., 2024-03-08. (21/08436-9, 23/06107-3, 19/23673-7)

MARCELLA GAUTÊ CAVALCANTE XAVIER; JOSÉ EDUARDO SPINELLI. The Impacts of Co and Ni Additions to High Solute Content Fe-Contaminated Al alloys in Beneficing Microstructure and Tensile Properties. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 27, 2024-03-25. (19/23673-7, 23/06107-3)

REYES, RODRIGO ANDRE VALENZUELA; DE GOUVEIA, GUILHERME LISBOA; SPINELLI, JOSE EDUARDO. Towards optimizing cooling rate, microstructure, and compressive strength in rapidly solidified Cu-20Fe alloy. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 32, p. 9-pg., 2024-07-30. (23/06107-3)

DE GOUVEIA, GUILHERME LISBOA; SPINELLI, JOSE EDUARDO; KOGA, GUILHERME YUUKI. Origin of the time-dependent corrosion behavior of biodegradable Mg-Si-Zn alloys in simulated body fluid. Corrosion Science, v. 237, p. 17-pg., 2024-08-07. (19/01432-8, 23/06107-3, 22/01895-0)

LEAL, JADERSON RODRIGO DA SILVA; REYES, RODRIGO ANDRE VALENZUELA; DE GOUVEIA, GUILHERME LISBOA; COURY, FRANCISCO GIL; SPINELLI, JOSE EDUARDO. Evaluation of Solidification and Interfacial Reaction of Sn-Bi and Sn-Bi-In Solder Alloys in Copper and Nickel Interfaces. METALS, v. 14, n. 9, p. 20-pg., 2024-09-01. (23/06107-3)

DE GOUVEIA, GUILHERME LISBOA; GANJU, ESHAN; MOURA, DANUSA; MORANKAR, SWAPNIL K.; SPINELLI, JOSE EDUARDO; CHAWLA, NIKHILESH. 3D X-ray Tomography Analysis of Mg-Si-Zn Alloys for Biomedical Applications: Elucidating the Morphology of the MgZn Phase. APPLIED SCIENCES-BASEL, v. 14, n. 17, p. 20-pg., 2024-09-01. (19/01432-8, 23/06107-3, 22/01895-0)

DE CARVALHO, CASSIA CARLA; SOBRAL, BRUNO SILVA; DE SOUSA, RAI BATISTA; PAIXAO, JEVERTON LAUREANO; DANTAS, SUYLAN LOURDES DE ARAUJO; SPINELLI, JOSE EDUARDO; SILVA, BISMARCK LUIZ. Effects of Different Zinc Content on Solidification, Microstructure, and Mechanical Properties in Tin-Bismuth Alloy. ADVANCED ENGINEERING MATERIALS, v. 26, n. 21, p. 18-pg., 2024-07-30. (23/06107-3)

SANTOS, PEDRO GABRIEL BENEDITO DE OLIVEIRA; GOMES, LEONARDO FERNANDES; SPINELLI, JOSE EDUARDO. Solidification and Strength Behavior of A356 Al Alloy Wheels. INTERNATIONAL JOURNAL OF METALCASTING, v. 18, n. 4, p. 19-pg., 2024-02-29. (23/06107-3, 19/23673-7)