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首页> 外文期刊>Materials Science and Engineering >Concurrent enhancement of strength and ductility for Al-Si binary alloy by refining Si phase to nanoscale
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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阶段纳入纳米级，同时增强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：本研究表明，通过通过高压溶液处理（HPST）和随后的老化处理来定制Si相的沉淀，同时提高Al-7wt％Si二元合金的强度和延展性的新方法。由于在HPST下的高度增强的溶解度，并且在老化处理期间，由于在HPST下的高度增强，并且大量纳米级Si颗粒被重新沉淀出来，将粗SI薄片完全溶解在Al基质中。巨大的球形和板状Si沉淀物有效地提高了根据orowan机制的屈服强度，然后进行包括棱柱形冲孔和颗粒旋转的塑性松弛。靠近球形沉淀物的棱柱冲击导致快速脱位积累，而板状沉淀物的旋转导致界面处的位错湮灭。当两种类型的沉淀物的比例合理时，位错密度将是平衡的，然后实现高均匀的伸长率。因此，引入两种不同类型的颗粒作用作为位错源的颗粒，并沉入粗粒合金中，这对于平衡位错密度来说至关重要并实现优异的机械性能。

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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：Al-Si合金;纳米粒子;塑料松弛;强度;延展性;

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