Effect of rare-earth La on microstructure and mechanical properties of Al7Si4CuMg alloys prepared by squeeze casting

Zhao, Biwei; Xing, Shuming; Sun, Hongji; Yan, Guangyuan; Gao, Wenjing; Ou, Liming

doi:10.1007/s10853-022-07358-7

Cited by 13 publications

(1 citation statement)

References 49 publications

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“…The average contact angle was calculated from the DSC experiments, as shown in Figure 3 and summarized in Table 3 . Through the contact angle, the addition of La causes lower supercooling during nucleation, resulting in the low area fraction [ 25 , 26 , 27 ]. The calculated average contact angle values were analyzed to be 20.3, 17.2, and 20.9 for La contents of 0, 0.5, and 1 wt%, respectively, and the lowest angle was observed at 0.5 wt%.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the Corrosion Properties of Al–10%Si–2%Cu Alloys with La Addition

Kim,

Heo,

Yang

et al. 2024

Materials

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Al–10%Si–2%Cu alloys have been widely used in high-value industries (e.g., aerospace and automobiles) because of their lower specific gravity; however, galvanic corrosion rendered these alloys to have poor corrosion resistance. Therefore, the microstructure and corrosion properties of Al–10%Si–2%Cu alloys were investigated with respect to the lanthanum (La) content. All Al alloy samples were synthesized using gravity casting, with added La contents of 0.00, 0.25, 0.50, 0.75, and 1.00 wt%, and were characterized using microstructural characteristics analysis and electrochemical tests. Adding 0.5 wt% La (xLa-0.5) indicated the finest structure, which had a 4% lower α-Al area fraction than the La-free alloy (xLa-0). However, the area fraction of a 1 wt% La-added (xLa-1) alloy was 2.4% higher than that of xLa-0. The corrosion current density (Icorr) of the xLa-0.5 was 1.09 μA/cm2, representing a 68% decrease as compared to that of xLa-0, and xLa-0.5 reached the highest polarization resistance value (7.32 × 103 Ω·cm2). The improvement in corrosion resistance of xLa-0.5 was due to the rapid and dense formation of a passivation layer induced by its fine structure, as well as the precipitated phase by enhancing the dispersibility of Cu.

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Section: Resultsmentioning

confidence: 99%