首页|Novel Al-Co-Ni-Cu as-cast alloy with high damping and good corrosion resistance
Novel Al-Co-Ni-Cu as-cast alloy with high damping and good corrosion resistance
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NSTL
Elsevier
? 2022 Elsevier B.V.A new multi-principal Al-Co-Ni-Cu alloy with high damping and good corrosion resistance was prepared. The effects of the Al content on the microstructure, damping properties, corrosion behavior, and mechanical properties of AlxCoNi2Cu (x = 0, 0.1, 0.3, and 0.5) alloys were studied. AlxCoNi2Cu (x = 0–0.5) alloys exhibited face-centered cubic (FCC) crystal structures. The Al0.5CoNi2Cu alloy displayed a significant increase in the internal friction (IF) value (Q?1) compared to other AlxCoNi2Cu alloys (x = 0–0.3). The maximum Q?1 of the Al0.5CoNi2Cu alloy was 0.032, which was twice that of AlxCoNi2Cu (x = 0–0.3) alloys and almost equal to that of the traditional Mn-Cu damping alloy. The mechanism for the sudden increase in the damping property of the alloys was explained by the interaction between the precipitated Ni3Al phase and the dislocations generated during the nucleation process. Moreover, the Al0.5CoNi2Cu alloy exhibited a lower corrosion current and rate in electrochemical and immersion tests in a 3.5 wt% NaCl solution compared to AlxCoNi2Cu (x = 0–0.3) alloys. Supersaturated Al solubilized in the matrix, resulting in the formation of Al2O3 protective films which effectively delayed the corrosion process. In addition, the Al0.5CoNi2Cu alloy exhibited good corrosion resistance, comparable to that of ferritic stainless steel, making it a promising candidate for marine applications.
NSTL
Elsevier
