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首页> 外文期刊>Materials Science and Engineering >Processing, multiscale microstructure refinement and mechanical property enhancement of hypoeutectic Al-Si alloys via in situ bimodal-sized TiB_2 particles
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Processing, multiscale microstructure refinement and mechanical property enhancement of hypoeutectic Al-Si alloys via in situ bimodal-sized TiB_2 particles

机译：通过原位双峰TiB_2颗粒处理亚共晶Al-Si合金的工艺，多尺度微结构细化和力学性能增强

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摘要

A comprehensive investigation of the trace additions of in situ novel bimodal-sized (nano and submicron) TiB_2 particles on the solidification behavior, microstructure and mechanical property evolution of Al-7Si-4Cu alloys were carried out through remelting and dilution-assisted ultrasonic vibration. The results showed that both the primary α-Al dendrites and eutectic Si structure were greatly refined in the presence of 0.7 wt% bimodal-sized TiB_2 particles, with a reduction of 79.0% and 53.7% compared to the base alloy, which is far beyond the efficiency of micron-sized TiB_2 particles. Additionally, the average diameter of the θ' precipitates was greatly reduced by 32.7%. Thermal analysis revealed that the bimodal-sized TiB_2 particles sharply shifted the nucleation temperature of primary α-Al from 600.7 ℃ to 607.1 ℃; meanwhile, the corresponding recalescence undercooling decreased by 3.6 ℃. More importantly, in contrast with the common dilemma of strength-ductility trade-off, the yield strength and elongation to fracture of the inoculated Al-7Si-4Cu alloy were simultaneously and significantly improved by 26.3% and 71.1%, respectively. In this work, the mechanisms of multiscale microstructure refinement and mechanical property enhancement by bimodal-sized TiB_2 particles were systematically discussed.
机译：通过重熔和稀释辅助超声振动，对原位新型双峰尺寸（纳米和亚微米）TiB_2颗粒对Al-7Si-4Cu合金的凝固行为，显微组织和力学性能演变的痕量添加物进行了全面研究。结果表明，在存在0.7 wt％双峰尺寸TiB_2颗粒的情况下，α-Al树枝状晶体和共晶Si结构都得到了极大地细化，与基础合金相比分别减少了79.0％和53.7％。微米级TiB_2颗粒的效率。此外，θ'析出物的平均直径大大降低了32.7％。热分析表明，双峰尺寸的TiB_2粒子使原生α-Al的成核温度从600.7℃急剧变化到607.1℃。同时，相应的过冷度降低了3.6℃。更重要的是，与强度-延展性折衷的通常困境相反，接种的Al-7Si-4Cu合金的屈服强度和断裂伸长率分别同时显着提高了26.3％和71.1％。在这项工作中，系统地讨论了双峰大小的TiB_2颗粒的多尺度微结构细化和机械性能增强的机理。

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  • 来源
    《Materials Science and Engineering》 |2020年第10期|139081.1-139081.12|共12页
  • 作者

    Qiang Li; Feng Qiu; Bai-Xin Dong; Xiang Gao; Shi-Li Shu; Hong-Yu Yang; Qi-Chuan Jiang;

  • 作者单位

    State Key Laboratory of Automotive Simulation and Control Jilin University PR China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and Engineering Jilin University Renmin Street NO. 5988 Changchun Jilin Province 130025 PR China;

    State Key Laboratory of Automotive Simulation and Control Jilin University PR China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and Engineering Jilin University Renmin Street NO. 5988 Changchun Jilin Province 130025 PR China Qingdao Automotive Research Institute of Jilin University PR China;

    School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang 212003 Jiangsu China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    In situ bimodal-sized TiB_2 particles; Hypoeutectic Al-Si alloys; Multiscale refinement; Strengthening mechanisms;

    机译：原位双峰TiB_2颗粒;亚共晶Al-Si合金;多尺度细化;加强机制;

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