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The LM25 aluminum alloy was obtained using the spray deposition method at an
optimum pressure of approximately 10 bar, a deposition distance of approximately 41 cm. and
an inclination angle of 0.. The central portion of the spray deposit was warm rolled to obtain
various thickness reductions, i.e., 0%, 20%, 40%, 60%, and 80% at 100.C; it was found that
the number of pores decreased as the thickness reduction increased. It was observed that the
fine microstructure and secondary phase in the samples with a larger percentage of thickness
reduction was due to the expediting cooling and freezing rate of the molten metal. The
porosity and mechanical properties were better in the spray deposited and warmed rolled
LM 25 substrate than the cast LM25 alloy.
Keywords: spray forming, warm rolling, microstructure, porosity, hardness |
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