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Enhanced grain refinement and mechanical properties of a high-strength Al-Zn-Mg-Cu-Zr alloy induced by TiC nano-particles

机译：增强由TiC纳米粒子诱导的高强度Al-Zn-Mg-Cu-Zr合金的晶粒细化和力学性能

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摘要

Grain refinement of Zr-containing Al alloys has attracted extensive attention for many years in both industry and academia, since "Zr-poisoning" phenomenon always happens when commercial refiner is applied in such alloys. This unrecoverable grain nucleating obstacle finally leads to poor grain refinement efficiency. In this work, a special Al-Ti-C master alloy rich in TiC nano-particles was applied to a high-strength Al-Zn-Mg-Cu-Zr alloy (i. e. 7050 alloy). The effects of TiC nano-particles on the microstructure and mechanical properties of 7050 alloy during solidification, hot extrusion and subsequent heat treatment were systematically investigated. The results show that prominent grain refinement occurs with TiC addition through both the growth restriction effect and heterogeneous nucleation. Meanwhile, TiC nano-particles are more inclined to distribute along grain boundaries than the interior of matrix grains after solidification. After subsequent homogenization and hot extrusion, TiC nano-particles tend to align along extrusion direction. In comparison with 7050 matrix alloy, the tensile properties especially ductility of 1% TiC_p/7050 composite after heat treatment have been improved obviously. Furthermore, it is worth noting that precipitates in the composite have also been obviously refined. Synergetic effects of grain refinement, refined precipitates and increased dislocation density are responsible for the optimized mechanical properties of TiC_p/7050 composite. This work provides new insights for controlling matrix grains of Zr-containing Al alloys and developing low-cost Al matrix composites.
机译：含有Zr的Al合金的晶粒细化在工业和学术界的许多年里都引起了广泛的关注，因为当商业炼油厂在这种合金中应用了商业炼油厂时，由于“Zr-中毒”现象。这种不可恢复的谷物成核障碍率最终导致晶粒细化效率差。在这项工作中，将富含TiC纳米颗粒的特殊Al-Ti-C母母合金应用于高强度Al-Zn-Mg-Cu-Zr合金（即7050合金）。系统研究了TiC纳米颗粒对7050合金在凝固，热挤出和随后的热处理过程中的微观结构和机械性能的影响。结果表明，通过生长限制效应和异质成核来加入突出的晶粒细化。同时，TiC纳米颗粒更倾向于沿着凝固后的基质颗粒内部分布沿晶界。在随后均匀化和热挤出后，TiC纳米颗粒倾向于沿挤出方向对齐。与7050基质合金相比，在热处理后，张力特性尤其是1％TiC_P / 7050复合材料的延展性显而易见。此外，值得注意的是，复合材料中的沉淀也已明显精制。晶粒细化，精制沉淀物和增加的位错密度的协同作用负责TIC_P / 7050复合材料的优化机械性能。这项工作提供了用于控制含Zr的Al合金的基质晶体和开发低成本Al基质复合材料的新见解。

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  • 来源
    《Materials Science and Engineering》 |2021年第4期|140852.1-140852.13|共13页
  • 作者

    Kai Zhao; Tong Gao; Huabing Yang; Kaiqi Hu; Guiliang Liu; Qianqian Sun; Jinfeng Nie; Xiangfa Liu;

  • 作者单位

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China Shandong Al & Mg Melt Tech Co. Ltd Jinan 250061 Shandong China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China Shandong Al & Mg Melt Tech Co. Ltd Jinan 250061 Shandong China;

    Nano and Heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 China;

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  • 正文语种 eng
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  • 关键词

    Grain refinement; Mechanical properties; 7050 alloy; TiC nano-particles; Composites;

    机译：晶粒细化;机械性能;7050合金;Tic纳米粒子;复合材料;

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