Aging characteristics of the Al-Si-Cu-Mg cast alloy modified with transition metals Zr, V and Ti

[摘要] The hypoeutectic Al-7Si-1Cu-0.5Mg base alloy was modified with different contents of Zr, V and Ti. The wedge-shape samples with varying solidification rates during casting were subjected to isochronal aging at temperatures up to 500 °C. Moreover, as-cast and solution treated alloys were subjected to long-term isothermal aging at 150°C. As a reference, the A380 alloy, seen as commercial standard for the automotive application target, was used. The modified alloys exerted different aging characteristics than the A380 grade with higher peak hardness and lower temperature of alloy softening. Besides, the influence of the applied solidification rates on hardness after aging was less pronounced in modified alloys than in the A380 grade. For three combinations of Zr, V and Ti tested with contents of individual elements ranging from 0.14 to 0.47%, no essential differences in aging characteristics were recorded. The results are discussed in terms of the role of chemistry and heat treatment in generating precipitates contributing to the thermal stability of Al based alloys.

[发布机构] CanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton; ON; L8P 0A5, Canada^1;Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto; ON; M5B 2K3, Canada^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Aging characteristics;Al-based alloys;Automotive applications;Commercial standards;Isothermal aging;Lower temperatures;Solidification rate;Solution-treated alloys