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Dispersoid characteristics and elevated temperature creep resistance of Al–Si–Mg cast alloy with Zr addition
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2022-01-13 , DOI: 10.1016/j.msea.2021.142570
Huilan Huang 1, 2, 3 , Wang Li 4 , Chuanbo Hu 5 , Lipeng Ding 3, 6 , Zhihong Jia 3, 6 , Nan Zhou 1, 2
Affiliation  

The present work aims to reveal the dispersoids evolution and the valuable role of Zr on the elevated-temperature creep resistance of Al–7Si-0.3Mg alloy. At 300°C and 25 MPa, Al–7Si-0.3Mg-0.15Zr alloy exhibits more than double decrement in the minimum creep rate, and 263 h increment in creep time-to-fracture compared to the Zr-free cast alloy. These effects were owe to the formation of novel nanobelt-like Si2Zr and rectangle-like (Al, Si)3–Zr dispersoids during solutionising at 560°C for 20 h. The Si atoms could substitute for Al sites to form stable L12-Al2Si1Zr structure. The thermally stable dispersoids were semi-coherent/coherent with the Al matrix, which impeded the movement of dislocations during creep deformation at 300°C. It demonstrated that the superior creep resistance (300°C) achieved in the Al–7Si-0.3Mg-0.16Zr alloy was attributed to the introduction of novel Zr-containing dispersoids.



中文翻译:

Zr添加Al-Si-Mg铸造合金的弥散相特性及抗高温蠕变性能

本工作旨在揭示弥散体的演变以及 Zr 对 Al-7Si-0.3Mg 合金高温蠕变抗力的重要作用。在 300°C 和 25 MPa 时,与不含 Zr 的铸造合金相比,Al-7Si-0.3Mg-0.15Zr 合金的最小蠕变速率减少了一倍以上,蠕变断裂时间增加了 263 小时。这些效果是由于在 560°C 溶解 20 小时期间形成了新型纳米带状 Si 2 Zr 和矩形 (Al, Si) 3 -Zr 弥散体。Si原子可以代替Al位点形成稳定的L1 2 -Al 2 Si 1锆结构。热稳定的分散体与 Al 基体是半共格/共格的,这在 300°C 蠕变变形期间阻碍了位错的运动。它证明了在 Al-7Si-0.3Mg-0.16Zr 合金中实现的优异抗蠕变性(300°C)归因于新型含 Zr 分散体的引入。

更新日期:2022-02-01
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