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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical properties of a bulk ultrafine grained Al-7Si-0.3Mg alloy produced by thermomechanical consolidation of a nanocrystalline powder
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Microstructure and mechanical properties of a bulk ultrafine grained Al-7Si-0.3Mg alloy produced by thermomechanical consolidation of a nanocrystalline powder

机译：纳米晶粉末热机械固结制备的块状超细晶粒Al-7Si-0.3Mg合金的组织和力学性能

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摘要

A nanocrystalline Al-7Si-0.3Mg (wt%) alloy powder prepared by high energy mechanical milling was consolidated by two powder metallurgy routes to produce a bulk ultrafine grained Al-7Si-0.3Mg Alloy: vacuum hot pressing (VHP) in combination with hot extrusion (HE) and spark plasma sintering (SPS) in combination with HE. Dynamic recrystallization, Al grain growth, Si particle coarsening and formation of GP zones occurred during consolidation. Meanwhile, with increasing the extrusion ratio, the Si particles distribution became more uniform due to the flow of Si particles. With the VHP-HE route, increasing the extrusion ratio from 9:1 to 25:1 improved the tensile strength by 7.8% and elongation to fracture by 51% due to decrease of average grain size, enhancement of interparticle bonding and more uniform Si particle distribution. Similarly, with the same extrusion ratio of 9:1, the use of SPS instead of VHP for the first consolidation step did not change the tensile strength significantly, but improved the elongation to fracture by 90% for the same reasons. Analysis of the various contribution mechanisms to the yield strength shows that grain boundary strengthening and GP zone strengthening make the major contributions.
机译：通过两种粉末冶金方法将通过高能机械研磨制备的纳米晶Al-7Si-0.3Mg（wt％）合金粉末进行固结，以生产块状超细晶粒Al-7Si-0.3Mg合金：真空热压（VHP）与结合使用热挤压（HE）和火花等离子体烧结（SPS）。固结过程中发生了动态再结晶，Al晶粒长大，Si颗粒粗化和GP区的形成。同时，随着挤压比的增加，由于硅颗粒的流动，硅颗粒的分布变得更加均匀。采用VHP-HE路线时，由于平均晶粒尺寸减小，颗粒间键合增强和硅颗粒更加均匀，因此将挤出比从9：1增加到25：1可将拉伸强度提高7.8％，将断裂伸长率提高51％。分配。同样，在9：1的相同挤出比下，在第一步固结步骤中使用SPS代替VHP不会显着改变拉伸强度，但出于相同的原因，断裂伸长率却提高了90％。对屈服强度的各种贡献机制的分析表明，晶界强化和GP区域强化是主要的贡献。

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  • 来源
    《Materials Science and Engineering》 |2016年第21期|192-202|共11页
  • 作者

    J.M. Liang; C. Kong; M.Z. Quadir; Y.F. Zheng; X. Yao; P. Munroe; D.L. Zhang;

  • 作者单位

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW 2052, Australia;

    Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW 2052, Australia;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia;

    State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

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

    Ultrafine grained alloy; Aluminium alloy; Powder metallurgy; Mechanical properties; Microstructure;

    机译：超细晶粒合金;铝合金;粉末冶金;机械性能微观结构;

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