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Regulation mechanism of aging behavior and mechanical properties of 2195-T34 Al-Li alloy at different stress levels

不同应力水平对2195-T34 Al−Li合金时效行为的影响机制研究

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Abstract

The effect of aging on the mechanical properties of the 2195-T34 Al−Li alloy at different stress levels was investigated. When the stress was below the high-temperature yield strength (YS), the YS and elongation (EL) of the low-stress aged (LSA) and stress-free aged (SFA) specimens were similar. When the stress exceeded the high-temperature YS, the ultimate tensile stress (UTS) and EL of the specimens (HSA specimens) decreased significantly. This decrease suggested that an increase in stress reduced the damage resistance of the material. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) observations showed that variations in the effect of stress on the material properties were attributed to the combined effect of internal precipitate characteristics and Cu-rich precipitates at the grain boundary. The increase in stress induced the segregation of Cu atoms at the grain boundaries to form Cu-rich precipitates, facilitating the formation of precipitation-free zones (PFZ) at the grain boundaries. In addition, Cu-rich precipitates could act as damage nucleation sites, reducing the ductility of the material.

摘要

研究了不同应力水平下2195-T34 Al−Li合金的时效特性变化。当应力低于材料的高温屈服强度(YS)时,低应力时效(LSA)和无应力时效(SFA)试样的屈服强度和延伸率(EL)相近。当应力超过材料的高温屈服强度时,试样的极限拉伸强度(UTS)和伸长率显著下降,表明应力的增加降低了材料的抗破坏性。透射电子显微镜(TEM)和扫描电子显微镜(SEM)的观察结果表明:应力对材料时效性能的影响归因于内部析出物特征和晶界富铜析出物的共同作用。应力的增加促使铜原子在晶界发生偏析形成富铜析出物,同时促进了晶界无沉淀区(PFZ)的形成,而富铜析出物是脆性相,可作为损伤的起始位置,容易导致裂纹萌生和发展,降低材料的延展性。

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Authors and Affiliations

  1. Light Alloy Research Institute of Central South University, Changsha, 410083, China

    Fei Chen  (陈非), Li-hua Zhan  (湛利华), Yong-qian Xu  (徐永谦), Chun-hui Liu  (刘春辉), Bo-lin Ma  (马博林), Quan-qing Zeng  (曾泉清) & Zheng-gen Hu  (胡正根)

  2. School of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Li-hua Zhan  (湛利华)

  3. State Key Laboratory of High-performance Complex Manufacturing, Central South University, Changsha, 410083, China

    Li-hua Zhan  (湛利华), Yong-qian Xu  (徐永谦) & Chun-hui Liu  (刘春辉)

  4. Beijing Institute of Astronautical Systems Engineering, Beijing, 100176, China

    Zheng-gen Hu  (胡正根), Wen-li Zhu  (朱文俐) & Dong-yang Yan  (鄢东洋)

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  1. Fei Chen  (陈非)
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Contributions

The overarching research goals were developed by ZHAN Li-hua and XU Yong-qian. ZHAN Li-hua provided the fund supports. LIU Chun-hui and MA Bo-lin conducted the literature review. CHEN Fei analyzed the measured data and edited the draft of manuscript. ZHAN Li-hua, ZENG Quan-qing, HU Zheng-gen, ZHU Wen-li, and YAN Dong-yang edited the manuscript.

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Correspondence to Li-hua Zhan  (湛利华).

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No potential conflict of interest was reported by the authors.

Additional information

Foundation item: Projects(U22A20190, 52175373, 52005516) supported by the National Natural Science Foundation of China; Project (ZZYJKT2021-03) supported by the State Key Laboratory of High Performance Complex Manufacturing, Central South University, China; Project(2020RC4001) supported by the Science and Technology Innovation Program of Hunan Province, China

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Chen, F., Zhan, Lh., Xu, Yq. et al. Regulation mechanism of aging behavior and mechanical properties of 2195-T34 Al-Li alloy at different stress levels. J. Cent. South Univ. 31, 11–24 (2024). https://doi.org/10.1007/s11771-023-5526-y

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