Samuel Ehab, Nabawy Ahmed M, Samuel Agnes M, Doty Herbert W, Songmene Victor, Samuel Fawzy H
Département des Sciences Appliquées, Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada.
Materials Technology, General Motors Global Technology Center, Warren, MI 48093-2350, USA.
Materials (Basel). 2022 Jun 27;15(13):4511. doi: 10.3390/ma15134511.
The present work investigated the effect of aging treatment on the microstructure and tensile properties of an Al-2%Cu base alloy containing various additions of Zr and other alloying elements. Aging was carried out at temperatures of 180-300 °C for different aging times at each temperature. The tensile properties indicated that Zr additions improved the strength of the base alloy, especially at high Zr levels at 180 °C. At the 220 °C aging temperature, however, while Zr addition did not have a beneficial effect on the alloy strength, the ductility was found to improve. Zr-Ti combined additions had a significant effect on the microstructure of the base alloy, as the morphology of the α-Al grains transformed into a non-dendritic morphology, and the grain size decreased sharply. These effects were at their maximum at 180 °C and 0.5 wt% Zr addition. Moreover, the Zr-containing alloys aged at higher temperatures, such as 220 °C and 240 °C, maintained a noticeably higher level of strength over the base alloy aged at the same temperatures. Quality index charts based on the tensile test data also reflected an improvement in alloy quality and strength with Zr-Ti combined additions.
本研究调查了时效处理对含不同添加量Zr及其他合金元素的Al-2%Cu基合金微观结构和拉伸性能的影响。在180-300°C的温度下进行时效处理，每个温度下设置不同的时效时间。拉伸性能表明，添加Zr提高了基合金的强度，尤其是在180°C下高Zr含量时。然而，在220°C时效温度下，虽然添加Zr对合金强度没有有益影响，但发现其延展性有所提高。Zr-Ti复合添加对基合金的微观结构有显著影响，α-Al晶粒的形态转变为非枝晶形态，且晶粒尺寸急剧减小。这些影响在180°C和添加0.5 wt%Zr时最为明显。此外，在较高温度（如220°C和240°C）下时效的含Zr合金，与在相同温度下时效的基合金相比，强度明显更高。基于拉伸试验数据的质量指标图也反映出Zr-Ti复合添加提高了合金质量和强度。
