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首页> 外文期刊>Journal of Materials Research >Effects of Cu content on the microstructure, mechanical property, and hot tearing susceptibility of die casting hypereutectic Al-22Si-0.4Mg alloy
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Effects of Cu content on the microstructure, mechanical property, and hot tearing susceptibility of die casting hypereutectic Al-22Si-0.4Mg alloy

机译：Cu含量对压铸过共晶Al-22Si-0.4Mg合金的组织，力学性能和热撕裂敏感性的影响

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摘要

The effects of Cu content on the microstructure, mechanical property, and hot tearing susceptibility of die casting Al-22Si-0.4Mg alloy have been investigated. Different Cu contents (1.5, 2.5, 3.5, 4.5 wt%) were added in Al-22Si-0.4Mg alloy. In the as-cast microstructure, the amount, volume fraction, and average size of Al_2Cu phase increase with more Cu addition. The morphology of grain boundary white Al_2Cu phase turns from particle to lump. The UTS (ultimate tensile strength) of Al-22Si-xCu-0.4Mg alloy improves with Cu added, which is mainly caused by the strengthening effect of intergranular Al_2Cu. The hot tearing susceptibility apparently rises with Cu content increased, which is due to longer quaternary eutectic reaction time, larger amount of residual intergranular Cu-rich liquid film spreading out over α-Al grain boundary, and higher quaternary eutectic reaction temperature. Considering both the mechanical property and hot tearing susceptibility, optimal Cu content for die casting Al-22Si-0.4Mg alloy found in this paper is 2.5 wt%.
机译：研究了铜含量对压铸Al-22Si-0.4Mg合金的组织，力学性能和热撕裂敏感性的影响。在Al-22Si-0.4Mg合金中添加不同的Cu含量（1.5、2.5、3.5、4.5 wt％）。在铸态组织中，Al_2Cu相的含量，体积分数和平均尺寸随着Cu的添加而增加。晶界白色Al_2Cu相的形貌由颗粒变为块状。添加Cu可以改善Al-22Si-xCu-0.4Mg合金的UTS（最终拉伸强度），这主要是由于晶间Al_2Cu的强化作用。 Cu含量的增加，热撕裂敏感性明显增加，这是由于较长的季共晶反应时间，大量残留的晶间富Cu液膜分布在α-Al晶界上以及较高的季共晶反应温度所致。考虑到机械性能和热撕裂敏感性，本文中发现的压铸Al-22Si-0.4Mg合金的最佳Cu含量为2.5 wt％。

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  • 来源
    《Journal of Materials Research》 |2016年第22期|3629-3637|共9页
  • 作者

    Daqiang Cheng; Liang Zhang; Guohua Wu; Jimei Mao; Wencai Liu;

  • 作者单位

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

    National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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