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首页> 外文期刊>Materials Science and Engineering >High-temperature properties and microstructural evolution of Al-Cu-Mn-RE (La/Ce) alloy designed through thermodynamic calculation
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High-temperature properties and microstructural evolution of Al-Cu-Mn-RE (La/Ce) alloy designed through thermodynamic calculation

机译：通过热力学计算设计的Al-Cu-Mn-RE（La / Ce）合金的高温性能和组织演变

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摘要

A theory guide method based on thermodynamic calculation and experimental verification is performed on the composition optimization and heat treatment process of heat-resistant Al-Cu-Mn-RE(La/Ce) alloys. Al-5.0Cu-0.6Mn-1.5RE(La/Ce) is obtained to be the reasonable alloy composition for further investigation. The strength of heat treatment state alloy decreases 20-33 MPa as the temperature rises every 50 degrees C in the high temperature tensile experiments. The alloy has good heat resistance, with high temperature (300 degrees C) strength of 102.4 MPa. The high temperature fracture mode is a mixed forms of brittle and ductile fracture. Heat exposure temperature has a significant effect on both thermal and electrical conductivity, by influencing the morphology and distribution of heat-resistant phases. With the increase of heat exposure temperature, the tensile strength of the alloy firstly increases and then decreases. With heat exposure at 200 degrees C or 350 degrees C for 100 h, the room temperature tensile strength values are 232.77 MPa or 190.52 MPa, respectively, which indicates that the alloy has good high-temperature durable performance. The nano-sized Al2Cu phase, T phase and Al3Zr phase exist in the heat treatment state alloy, and result in good heat resistance. Heat exposure at 300 degrees C for 100 h leads to the growth of Al2Cu phase and close distribution of heat-resistant phase Al3Zr around the Al2Cu phase. Presence of eutectic phase hinders the dislocation movement and thus improves the resistance to deformation at high temperature.
机译：对耐热Al-Cu-Mn-RE（La / Ce）合金的成分优化和热处理工艺进行了基于热力学计算和实验验证的理论指导方法。 Al-5.0Cu-0.6Mn-1.5RE（La / Ce）是合理的合金成分，需要进一步研究。在高温拉伸实验中，随着温度每升高50℃，热处理态合金的强度降低20-33 MPa。该合金具有良好的耐热性，高温（300摄氏度）强度为102.4 MPa。高温断裂模式是脆性断裂和延性断裂的混合形式。暴露在外的温度通过影响耐热相的形态和分布，对导热率和电导率都有重要影响。随着暴露温度的升高，合金的拉伸强度先升高后降低。在200℃或350℃下暴露100小时后，室温拉伸强度值分别为232.77 MPa或190.52 MPa，这表明该合金具有良好的高温耐久性能。热处理状态合金中存在纳米级的Al2Cu相，T相和Al3Zr相，并具有良好的耐热性。在300摄氏度下暴露100小时会导致Al2Cu相的生长，并导致耐热相Al3Zr在Al2Cu相周围紧密分布。共晶相的存在阻碍了位错运动，从而提高了高温下的抗变形能力。

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  • 来源
    《Materials Science and Engineering》 |2019年第5期|7-18|共12页
  • 作者

    Zhao Binbin; Zhan Yongzhong; Tang Hongqun;

  • 作者单位

    Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Guangxi, Peoples R China|Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, Nanning 530004, Guangxi, Peoples R China;

    Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Guangxi, Peoples R China|Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, Nanning 530004, Guangxi, Peoples R China;

    Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Guangxi, Peoples R China|Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, Nanning 530004, Guangxi, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Al-Cu-Mn-RE alloy; CALPHAD; High-temperature properties; Microstructural evolution; Heat resistance;

    机译：Al-Cu-Mn-RE合金;CALPHAD;高温性能;组织演变;耐热性;

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