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首页> 外文期刊>Materials Science and Engineering >Enhanced strength and ductility of A356 alloy due to composite effect of near-rapid solidification and thermo-mechanical treatment
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Enhanced strength and ductility of A356 alloy due to composite effect of near-rapid solidification and thermo-mechanical treatment

机译：由于近快速凝固和热机械处理的复合效应，增强了A356合金的强度和延展性

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摘要

The coarse dendritic microstructure with non-uniform distribution of eutectic Si particles leads to poor ductility of A356 alloy, thus challenging the enhancement of mechanical properties through deformation at room temperature. Here, a new processing protocol was proposed by combining near-rapid solidification with two-step thermo-mechanical treatment (TMT). To significantly improve the ductility of the alloy, near-rapid solidification, in combination with first-step TMT including equal channel angular pressing (ECAP) and intermediate heat treatment, was applied to refine eutectic Si particles and make them evenly distributed in the matrix. On this basis, a high ultimate tensile strength similar to 483 MPa, with relatively good elongation to failure similar to 8.1% can be achieved by the subsequent ageing treatment and composite deformation (ECAP + cryorolling) of second-step TMT. The excellent combination of strength and ductility was mainly attributed to the synergistic effect of high density of dislocations, refined nanoscale Si particles and uniform distributed eutectic Si particles arising from this fabrication processing. This work provides a new idea for the preparation of high strength Al-Si cast aluminum alloy, so that the application of Al-Si cast alloy is promisingly expected to expand.
机译：具有非均匀分布的共晶Si颗粒的粗树枝状微观结构导致A356合金的延展性差，从而通过室温变形来挑战机械性能的增强。这里，通过将近快速凝固与两步热机械处理（TMT）相结合，提出了一种新的加工方案。为了显着改善合金的延展性，近快速凝固，与第一步骤TMT的组合，包括等沟道角压（ECAP）和中间热处理，用于细化共晶Si颗粒，使它们均匀地分布在基质中。在此基础上，通过随后的老化处理和第二步TMT的复合变形（ECAP + Cryoroling）可以实现与483MPa相似的高极其拉伸强度，其具有相对较好的失效伸长率与8.1％相似。强度和延展性的优异组合主要归因于高密度的位错，精制纳米级Si颗粒和由该制造处理产生的均匀分布共晶Si颗粒的协同效应。这项工作为制备高强度Al-Si铸铝合金提供了新的思路，因此施用Al-Si铸造合金的应用预计将扩大。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|168-178|共11页
  • 作者

    Zhang X.; Huang L. K.; Zhang B.; Chen Y. Z.; Duan S. Y.; Liu G.; Yang C. L.; Liu F.;

  • 作者单位

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

    Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China;

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

    A356 alloy; Near-rapid solidification; Two-step TMT; Strength; Ductility;

    机译：A356合金;近快速凝固;两步TMT;强度;延展性;

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