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Concurrent enhancement of strength and ductility for Al-Si binary alloy by refining Si phase to nanoscale

机译：通过将Si相细化为纳米级同时提高Al-Si二元合金的强度和延展性

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摘要

The present study suggests a novel method of simultaneous improvement of strength and ductility for Al-7 wt% Si binary alloy by tailoring the precipitation of Si phase via high pressure solution treatment (HPST) and subsequent aging treatment. The coarse Si flakes are fully dissolved into Al matrix owing to highly enhanced solubility under HPST, and plenty of nanoscale Si particles re-precipitate during aging treatment. The massive spherical and plate-like Si precipitates effectively improve the yield strength as per Orowan mechanism, and then plastic relaxation including prismatic punching and particle rotation takes place. The prismatic punching near spherical precipitates results in rapid dislocation accumulation, while the rotation of plate-like precipitates leads to dislocation annihilation at interfaces. The dislocation density would be balanced when the proportion of two types of precipitates is reasonable, and then high uniform elongation is achieved. Therefore, introducing two different types of particles acting as dislocation sources and sinks into coarse-grained alloys is crucial to balance dislocation density and achieve excellent mechanical properties.
机译：本研究提出了一种新的同时提高Al-7 wt％Si二元合金强度和延展性的新方法，方法是通过高压固溶处理（HPST）和随后的时效处理来调整Si相的沉淀。由于在HPST下的溶解度大大提高，粗大的硅片完全溶解在Al基体中，并且在时效处理过程中大量纳米级的硅颗粒会重新沉淀。根据Orowan机理，大量的球形和片状Si析出物有效地提高了屈服强度，然后发生了包括棱柱形冲压和颗粒旋转在内的塑性松弛。球形沉淀物附近的棱柱形冲孔导致位错快速积累，而板状沉淀物的旋转导致界面处的位错an没。当两种类型的析出物的比例合理时，位错密度将达到平衡，从而获得较高的均匀伸长率。因此，在粗晶粒合金中引入两种不同类型的颗粒作为位错源和位沉对于平衡位错密度和获得优异的机械性能至关重要。

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  • 来源
    《Materials Science and Engineering》 |2019年第28期|303-310|共8页
  • 作者

    Liu Maowen; Zheng Ruixiao; Xiao Wenlong; Yu Xiaohui; Peng Qiuming; Ma Chaoli;

  • 作者单位

    Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China;

    Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China;

    Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China;

    Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China;

    Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China;

    Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China;

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

    Al-Si alloys; Nanoparticles; Plastic relaxation; Strength; Ductility;

    机译：铝硅合金;纳米粒子;塑性松弛;强度;延展性;

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