Effects of thermal variables of solidification on the microstructure, hardness, and microhardness of Cu-Al-Ni-Fe alloys
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Aluminum bronze is a complex group of copper-based alloys that may include up to
14% aluminum, but lower amounts of nickel and iron are also added, as they di erently a ect
alloy characteristics such as strength, ductility, and corrosion resistance. The phase transformations
of nickel aluminum–bronze alloys have been the subject of many studies due to the formations
of intermetallics promoted by slow cooling. In the present investigation, quaternary systems of
aluminum bronze alloys, specifically Cu–10wt%Al–5wt%Ni–5wt%Fe (hypoeutectoid bronze) and
Cu–14wt%Al–5wt%Ni–5wi%Fe (hypereutectoid bronze), were directionally solidified upward under
transient heat flow conditions. The experimental parameters measured included solidification thermal
parameters such as the tip growth rate (VL) and cooling rate (TR), optical microscopy, scanning
electron microscopy (SEM) analysis, hardness, and microhardness. We observed that the hardness
and microhardness values vary according to the thermal parameters and solidification. We also
observed that the Cu–14wt%Al–5wt%Ni–5wi%Fe alloy presented higher hardness values and a more
refined structure than the Cu–10wt%Al–5wt%Ni–5wt%Fe alloy. SEM analysis proved the presence of
specific intermetallics for each alloy.
Como referenciar
NASCIMENTO, MAURICIO S.; SANTOS, GIVANILDO A. dos; TERAM, ROGERIO; SANTOS, VINICIUS T. dos; SILVA, MARCIO R. da; COUTO, ANTONIO A. Effects of thermal variables of solidification on the microstructure, hardness, and microhardness of Cu-Al-Ni-Fe alloys. Materials, v. 12, n. 8, p. 1-10, 2019. DOI: 10.3390/ma12081267. Disponível em: http://repositorio.ipen.br/handle/123456789/29978. Acesso em: 30 Dec 2025.
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