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Effect of double-step homogenization treatments on the microstructure and mechanical properties of Al-Cu-Li-Zr alloy

机译：双层均质化处理对铝 - Li-ZR合金微观结构和力学性能的影响

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摘要

The Al_3Zr particles formed in the Al-Cu-Li-Zr alloy during single and double-step homogenization treatments contributed to various microstructures and mechanical properties during the subsequent thermomechanical treatment. Compared with the single-step homogenization treatment (ST), the double-step homogenization treatment (DT) generated higher density and more uniform distribution of β' (Al_3Zr) phases, which makes the alloy retain more substructures and improve the initial strength of solid solution. During the ageing process, Al_3Zr particles induced the T_1 precipitation in grain interior and the width of PFZ get narrowed. Therefore, the strength and toughness of the DT sample improved in peak aged state compared with that of the ST sample. The peak hardness value of DT sample is 167.8 HV, which is higher than that of ST sample with 153.1 HV. Furthermore, the tensile strength and elongation of the DT sample at peak aged state (521 MPa, 556 MPa and 8.8 %, respectively) are higher than those of the STA sample (492 MPa, 535 MPa and 6.7 %, respectively), and the impact toughness of the DTA sample (13.2 J cm~(-2)) is also higher than those of STA sample (9.1 J cm-2). Strength model showed that more uniform distribution of Al_3Zr phases and substructures improve the initial strength of solid solution state, which increased by 16 MPa in the DT sample compared with the ST sample. The promotion of T_1 precipitation inducing the strength increased by 18 MPa in the DT sample at the peak aged state compared with that of the ST sample. The increase of elongation and toughness contributed from the oriented grains with finer distribution and higher Schmid factor, less grain boundaries precipitates and narrower PFZ width.
机译：在单步和双步均化处理期间在Al-Cu-Li-Zr合金中形成的Al_3Zr颗粒有助于在随后的热机械处理过程中有助于各种微观结构和机械性能。与单步均质化处理（ST）相比，双步均质化处理（DT）产生较高的密度和更均匀的β'（AL_3ZR）相分布，这使得合金保持更多的子结构并提高固体的初始强度解决方案。在老化过程中，Al_3ZR颗粒诱导晶粒内部的T_1沉淀，PFZ的宽度变窄。因此，与ST样品相比，DT样品的强度和韧性改善了峰值老化状态。 DT样品的峰值硬度值为167.8HV，其高于153.1HV的ST样品高。此外，DT样品在峰老化状态（521MPa，556MPa和8.8％）的拉伸强度和伸长率高于STA样品（492MPa，535MPa和6.7％），以及DTA样品的冲击韧性（13.2J厘米〜（-2））也高于STA样品（9.1J cm-2）。强度模型表明，与ST样品相比，Al_3ZR相和次结构的分布更均匀地改善了固溶液的初始强度，其在DT样品中增加了16MPa。与ST样品相比，在峰值老化状态下，促进T_1沉淀诱导强度在DT样品中增加了18MPa。伸长率和韧性的增加与具有细粒分布和更高的施密因子的导向晶粒有关，较少的晶界沉淀和较窄的PFZ宽度。

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  • 来源
    《Materials Science and Engineering》 |2020年第23期|139975.1-139975.12|共12页
  • 作者

    Yunlai Deng; Jinjun Xu; Jiqiang Chen; Xiaobin Guo;

  • 作者单位

    Light Alloy Research Institute Central South University Changsha China State Key Laboratory of High Performance and Complex Mmufacturing Central South University Changsha China School of Materials Science and Engineering Central South University Changsha China;

    Light Alloy Research Institute Central South University Changsha China State Key Laboratory of High Performance and Complex Mmufacturing Central South University Changsha China;

    School of Material Science and Engineering Jiangxi University of Science and Technology Ganzhou China Dongguan Eontec Co. Ltd. Dongguan 523662 China;

    School of Materials Science and Engineering Central South University Changsha China;

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  • 正文语种 eng
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  • 关键词

    Al-Cu-Li-Zr alloy; Homogenization; β' phase; Mechanical properties; Microstructures;

    机译：Al-Cu-Li-ZR合金;均匀化;β'阶段;机械性能;微观结构;

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