Al-Li-Cu-Mg-Sc-Zr铸造合金的高温力学性能:沉淀演变的综合研究

IF 7 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shen Zhang, Guohua Wu, Liang Zhang, Xuanxi Xu, Fangzhou Qi, Xin Tong, Youjie Guo
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引用次数: 0

摘要

具有高锂含量的铸铝锂合金具有优异的减重和增强刚度的效果,在航空航天结构部件中显示出巨大的潜力。然而,它们的应用通常受到服务温度限制的限制。在本研究中,系统地研究了Al-Li-Cu-Mg-Sc-Zr铸造合金在室温至300℃范围内的力学行为和显微组织演变。结果表明,Al3(Sc, Zr, Li)颗粒表现出优异的热稳定性,其显著的强化效果是在200℃下仍能保持300 MPa以上屈服强度的关键。在100°C时,与室温性能相比,合金性能没有明显变化。θ′相的抗粗化性能较差,在200℃时进行了广泛的粗化。拉伸过程中快速粗化和应力集中产生的内应力导致在相交θ′相处形成微裂纹,导致延伸率急剧下降。此外,在一些晶粒内部形成位错带,其特征是动态析出的细小S′相,在穿晶断裂中起主导作用。直到300℃,T1相才表现出明显的粗化,而θ′和S′相在该温度下几乎完全溶解,导致强度显著降低,并表现出延性断裂特征。该研究为铸铝锂合金的成分设计和高温下力学性能的提高提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unraveling the elevated-temperature mechanical properties of a cast Al-Li-Cu-Mg-Sc-Zr alloy: A comprehensive investigation of precipitation evolution
Cast Al-Li alloys with high Li content demonstrate exceptional weight reduction and stiffness enhancement effects, showing significant potential for aerospace structural components. However, their application is often constrained by service temperature limitations. In this study, the mechanical behavior and microstructural evolution of a cast Al-Li-Cu-Mg-Sc-Zr alloy were systematically investigated over a temperature range from room temperature to 300 °C. The results indicate that the Al3(Sc, Zr, Li) particles exhibit superior thermal stability, and their significant strengthening effect is crucial in maintaining yield strength exceeding 300 MPa even at 200 °C. At 100 °C, no significant alterations in alloy properties were observed compared to room temperature performance. The θ′ phase demonstrates poor coarsening resistance and undergoes extensive coarsening at 200 °C. The internal stresses generated by rapid coarsening and stress concentration during tension leads to microcrack formation at intersecting θ′ phases, resulting in a sharp decrease in elongation. Additionally, dislocation bands form within some grains, featuring dynamically precipitated fine S′ phases, which dominate transgranular fracture. The T1 phase does not exhibit significant coarsening until 300 °C, while the θ′ and S′ phases are nearly completely dissolved at this temperature, resulting in significant strength reduction and exhibiting ductile fracture characteristics. This study provides valuable insights for the compositional design of cast Al-Li alloys and the enhancement of their mechanical properties at elevated temperatures.
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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