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首页> 外文期刊>Materials Science and Engineering >The complex interaction between microstructural features and crack evolution during cyclic testing in heat-treated Al-Si-Mg-Cu cast alloys
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The complex interaction between microstructural features and crack evolution during cyclic testing in heat-treated Al-Si-Mg-Cu cast alloys

机译：热处理中循环试验期间微结构特征与裂纹演化的复杂相互作用

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摘要

The study aimed to investigate crack initiation and propagation at the micro-scale in heat-treated Al-7Si-Mg cast alloys with different copper (Cu) contents. In-situ cyclic testing in a scanning electron microscope coupled with electron back-scattered diffraction and digital image correlation was used to evaluate the complex interaction between the crack path and the microstructural features. The three-nearest-neighbour distance of secondary particles was a new tool to describe the crack propagation in the alloys. The amount of Cu retained in the α-Al matrix after heat treatment increased with the Cu content in the alloy and enhanced the strength with a slight decrease in elongation. During cyclic testing, the two-dimensional (2D) crack path appeared with a mixed propagation, both trans- and inter-granular, regardless of the Cu content of the alloy. On fracture surfaces, multiple crack initiation points were detected along the thickness of the samples. The debonding of silicon (Si) particles took place during crack propagation in the Cu-free alloy, while cracking of Si particles and intermetallic phases occurred in the alloy with 3.2 wt% Cu. Three-dimensional tomography using focused ion beam revealed that the improved strength of the α-Al matrix changes the number of cracked particles ahead of the propagating crack with Cu concentration above 1.5 wt%.
机译：该研究旨在研究具有不同铜（Cu）含量的热处理的Al-7Si-Mg铸造合金中微刻度的裂纹引发和繁殖。在扫描电子显微镜中的原位循环测试与电子背散射衍射和数字图像相关性相结合，用于评估裂纹路径和微结构特征之间的复杂相互作用。二次粒子的三个最接近邻距离是一种描述合金中裂纹繁殖的新工具。热处理后，在α-Al基质中保留在α-Al基质中的Cu的量随合金中的Cu含量而增加，并提高了伸长率略微降低的强度。在循环测试期间，无论合金的Cu含量如何，二维（2D）裂纹路径出现混合繁殖，两种晶体和颗粒状。在断裂表面上，沿着样品的厚度检测多裂纹引发点。在无铜合金中的裂纹繁殖期间发生硅（Si）颗粒的剥离，同时在具有3.2wt％Cu的合金中发生Si颗粒和金属间相的破裂。使用聚焦离子束的三维断层扫描显示，α-Al基质的改善强度改变了在传播裂缝之前的裂化颗粒的数量，Cu浓度高于1.5wt％。

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  • 来源
    《Materials Science and Engineering》 |2021年第21期|141930.1-141930.10|共10页
  • 作者

    Toni Bogdanoff; Lucia Lattanzi; Mattia Merlin; Ehsan Ghassemali; Anders E.W. Jarfors; Salem Seifeddine;

  • 作者单位

    Department of Materinb and Manufacturing Jonkoping University Box 1026 55312 Jonkoping Sweden;

    Department of Materinb and Manufacturing Jonkoping University Box 1026 55312 Jonkoping Sweden Department of Engineering University of Ferrara Via Giuseppe Saragat 1 44122 Ferrara Italy;

    Department of Engineering University of Ferrara Via Giuseppe Saragat 1 44122 Ferrara Italy;

    Department of Materinb and Manufacturing Jonkoping University Box 1026 55312 Jonkoping Sweden;

    Department of Materinb and Manufacturing Jonkoping University Box 1026 55312 Jonkoping Sweden;

    Department of Materinb and Manufacturing Jonkoping University Box 1026 55312 Jonkoping Sweden;

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

    Aluminium alloys; Electron microscopy; Characterisation; Casting methods; Fatigue;

    机译：铝合金;电子显微镜;特征;铸造方法;疲劳;

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