The Effect of minor addition of Ni on the microstructural evolution and mechanical properties of suction cast Al-0.14 at. pct Sc binary alloy

P Nandi, S Suwas, S Kumar… - Metallurgical and Materials …, 2013 - Springer
Metallurgical and Materials Transactions A, 2013Springer
Aluminum scandium binary alloys represent a promising precipitation-hardening alloy
system. However, the hardness of the binary alloys decreases with the rapid coarsening of
Al 3 Sc precipitate during high-temperature aging. In the current study, we report a new
approach to compensate for the loss of mechanical properties by combining rapid
solidification with very small ternary addition of transition metal Ni. This addition yields
dispersion, and at a critical concentration improves the mechanical properties. We explore …
Abstract
Aluminum scandium binary alloys represent a promising precipitation-hardening alloy system. However, the hardness of the binary alloys decreases with the rapid coarsening of Al3Sc precipitate during high-temperature aging. In the current study, we report a new approach to compensate for the loss of mechanical properties by combining rapid solidification with very small ternary addition of transition metal Ni. This addition yields dispersion, and at a critical concentration improves the mechanical properties. We explore additions of a maximum of 0.06 at. pct of Nickel to a binary Al-0.14 at. pct Sc alloy, which yield nickel-rich dispersions. We report two kinds of biphasic dispersions containing AlNi2Sc/Al9Ni2 and α-Al/Al9Ni2 phase combinations. The maximum improvement in mechanical properties occurs with the addition of 0.045 at. pct Ni with a yield strength of 239 ± 7 MPa for an aging treatment at 583 K (310 °C) for 15 hours.
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