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首页> 外文期刊>Materials Science and Engineering >A comprehensive analysis of a pseudo-brittle fracture at the interface of intermetallic of η and steel in aluminum/steel joints made by FSW: Microstructure and fracture behavior
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A comprehensive analysis of a pseudo-brittle fracture at the interface of intermetallic of η and steel in aluminum/steel joints made by FSW: Microstructure and fracture behavior

机译：FSW：微观结构和骨折行为综合分析η与钢制η与钢的界面界面

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摘要

Intermetallic compounds (IMCs) formation during friction stir welding (FSW) of dissimilar metals such as aluminum (Al) and steel (St) is known to cause a reduction in the joint strength. IMCs are brittle and act as the preferential sites for fracture propagation. In the present study, a modified FSW was used to join a commercially pure Al to a mild carbon St. Several characterization techniques were performed to analyze the joint interface and the results revealed that a nanostructured IMC layer made of Fe_4Al_(13) (θ) and a micrometer IMC layer made of Fe_2Al_5 (η) were formed adjacent to the Al side and St side, respectively. During the tensile test, the crack propagated through the interface of η-St and not through the IMCs layer. It was shown that the interface of n-St was prone to brittle debonding under normal load, but it showed a slight plastic deformation at the triple junctions with the q grain boundaries. At the triple junctions of boundaries, the loading state was shear and no debonding occurred during the tensile test. This promoted a pseudo-brittle fracture surface. The results of the present study showed that the grain refinement of the IMCs can improve the joint strength of the dissimilar materials through increasing the fracture toughness of the IMC and increasing the number of triple junctions at the interface of metal-IMC.
机译：已知诸如铝（Al）和钢（ST）的摩擦搅拌焊接（FSW）期间形成的金属间化合物（IMC）形成，例如铝（Al）和钢（ST），导致关节强度的降低。 IMCs是脆性的，并充当断裂繁殖的优先网站。在本研究中，修饰的FSW用于将商业纯的A1连接到轻度碳ST.进行几种表征技术以分析联合界面，结果显示由Fe_4Al_（13）（θ）制成的纳米结构IMC层并且分别与Fe_2Al_5（η）制成的千分尺IMC层分别与Al侧和ST侧相邻形成。在拉伸试验期间，裂缝通过η-st的界面传播而不是通过IMCS层。结果表明，N-ST的界面在正常负载下易于脆弱，但它在具有Q晶界的三交界处显示出轻微的塑性变形。在边界的三交界处，加载状态是剪切，在拉伸试验期间没有发生剥离。这促进了伪脆性骨折表面。本研究的结果表明，IMC的晶粒细化可以通过增加IMC的断裂韧性并增加金属-IMC界面处的三重连接数量来改善异种材料的关节强度。

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  • 来源
    《Materials Science and Engineering》 |2021年第8期|141812.1-141812.12|共12页
  • 作者

    R. Beygi; R.J.C Carbas; A.Q. Barbosa; E.A.S. Marques; L.F.M. da Silva;

  • 作者单位

    Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI) Rua Dr. Roberto Frias 4200-465 Porto Portugal;

    Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI) Rua Dr. Roberto Frias 4200-465 Porto Portugal;

    Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI) Rua Dr. Roberto Frias 4200-465 Porto Portugal;

    Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI) Rua Dr. Roberto Frias 4200-465 Porto Portugal;

    Department of Mechanical Engineering Faculty of Engineering of the University of Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal;

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  • 正文语种 eng
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  • 关键词

    Dissimilar joint; Intermetallic compounds; Interface; Nano structure; Fracture; Interface strength;

    机译：不同的关节;金属间化合物;界面;纳米结构;断裂;界面力量;

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