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Effects of Ti addition on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr alloy

机译：Ti添加对Al-Zn-Mg-Cu-Zr合金微观结构和力学性能的影响

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摘要

The effects of Ti addition (0.1 wt%) on the microstructure evolution and mechanical properties of an Al-7.6Zn-2.6Mg-2.0Cu-0.1Zr alloy were investigated during solidification, extrusion, solution treatment, and aging. The addition of Ti reduces the grain size and degree of phase agglomeration during solidification, thereby improving the strength and ductility of the as-cast alloy. The extrusion forms a bimodal structure consisting of fine dynamically recrystallized (DRXed) grains and coarse elongated unDRXed grains. Ti induces the refinement of the η-phases that enhances dynamic recrystallization (DRX) by particle-stimulated nucleation, resulting in reduced strength of the as-extruded alloy. The dissolution of the n-phase occurs in the initial stages of the solution treatment, followed by coarsening of the η-phase. The solution treatment causes static recrystallization and grain growth, increasing the grain size. The addition of Ti decreases the size and increases the number density of the Ll_2 precipitate by modifying the chemical composition of (Al,Zn)_3Zr into (Al,Zn)_3(Zr,Ti), and causes the formation of an Al_(18)Mg_3Ti_2 phase during the solution treatment. The addition of Ti also enhances heterogeneous nucleation of η-Mg(Zn,Cu,Al)_2 at the Al_18Mg3T_2 interface and grain boundary but has a negligible effect on the formation of nanoprecipitates (GPII zone, η') in the matrix. The improved strength and ductility of the solution-treated and aged alloys are attributed to the higher number density of the fine Ll_2-(Al,Zn)3(Zr,Ti) precipitates and grain refinement, as well as the finer q-phases acting as cracking sites.
机译：在凝固，挤出，溶液处理和老化期间，研究了Ti添加（0.1wt％）对Al-7.6Zn-2.6mg-2.0cu-0.1Zr合金的微观结构演化和机械性能的影响。加入Ti降低凝固过程中的晶粒尺寸和相块度的程度，从而提高了铸造合金的强度和延展性。挤出形成一种双峰结构，其由精细的动态再结晶（Drxed）颗粒和粗细长的未经细长的未经控制的晶粒组成。 Ti诱导通过颗粒刺激的成核增强动态再结晶（DRX）的η-相的细化，导致挤出合金的强度降低。 N相的溶解发生在溶液处理的初始阶段，然后粗化η-阶段。溶液处理导致静态重结晶和晶粒生长，增加晶粒尺寸。通过将（Al，Zn）_3-3（Zr，Ti）的化学组成改性（Al，Zn）_3（Zr，Ti）的化学组成，增加LL_2沉淀物的尺寸并增加LL_2沉淀物的数量密度，并导致形成AL_（18 ）溶液处理期间Mg_3Ti_2相。 Ti的添加还增强了Al_18MG3T_2界面和晶界处的η-mg（Zn，Cu，Al）_2的异质成核，但对基质中纳米沉淀物（GPII区，η'）的形成具有可忽略的影响。溶液处理和老化合金的改善的强度和延展性归因于细Ll_2-（Al，Zn）3（Zr，Ti）沉淀物和晶粒细化的较高数密度，以及较好的Q阶段作用作为破解网站。

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  • 来源
    《Materials Science and Engineering》 |2021年第13期|140437.1-140437.11|共11页
  • 作者

    Sang-Hwa Lee; Jae-Gil Jung; Sung-Il Baik; Sung Hyuk Park; Min-Seok Kim; Young-Kook Lee; Kwangjun Euh;

  • 作者单位

    Metallic Materials Division Korea Institute of Materials Science Changwon 51508 Republic of Korea Department of Materials Science and Engineering Yonsei University Seoul 03722 Republic of Korea;

    Metallic Materials Division Korea Institute of Materials Science Changwon 51508 Republic of Korea;

    Department of Materials Science and Engineering Northwestern University Evanston TL 60208 USA;

    School of Materials Science and Engineering Kyungpook National University Daegu 41566 Republic of Korea;

    Metallic Materials Division Korea Institute of Materials Science Changwon 51508 Republic of Korea;

    Department of Materials Science and Engineering Yonsei University Seoul 03722 Republic of Korea;

    Metallic Materials Division Korea Institute of Materials Science Changwon 51508 Republic of Korea Advanced Materials Engineering Korea University of Science and Technology (UST) Daejeon 34113 Republic of Korea;

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  • 关键词

    Aluminum alloys; Precipitation; Mechanical properties; Electron microscopy; Atom probe tomography;

    机译：铝合金;沉淀;机械性能;电子显微镜;原子探测断层扫描;

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