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首页> 外文期刊>Materials Science and Engineering >Mechanical properties and thermal stability of Al-Fe-Ni alloys prepared by centrifugal atomisation and hot extrusion
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Mechanical properties and thermal stability of Al-Fe-Ni alloys prepared by centrifugal atomisation and hot extrusion

机译：离心雾化和热挤压制备的Al-Fe-Ni合金的机械性能和热稳定性

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摘要

In this work, Al-12Fe and Al-7Fe-5Ni (wt%) alloys prepared by a novel technique including centrifugal atomisation and hot extrusion were studied. The microstructures were investigated using light microscopy, electron scanning microscopy, transmission electron microscopy and X-ray diffraction. The mechanical properties were determined by Vickers hardness measurements and compressive stress-strain tests. To study the thermal stability, the mechanical properties were also measured after 100 h of annealing at 300 ℃ and 400 ℃. In addition, creep tests at a stress of 120 MPa and a temperature of 300 ℃ were performed. The investigated materials were composed of fine-grained α-Al and intermetallic phases identified as Al_(13)Fe_4 and Al_9FeNi. The Vickers hardness and compressive yield strength were 68 HV5 and 183 MPa, respectively, for the Al-12Fe alloy and 73 HV5 and 226 MPa, respectively, for the Al-7Fe-5Ni alloy. After long-term annealing, the change in the mechanical properties was negligible, indicating the excellent thermal stability of both materials. The creep tests confirmed the highest thermal stability of the Al-7Fe-5Ni alloy with a total compressive creep strain of 15%. The "thermally stable" casting Al-12Si-1Cu-1Mg-1Ni alloy treated by the T6 regime was used as a reference material. The casting alloy exhibited sufficient mechanical properties (hardness and compressive yield strength) at room temperature. However, annealing remarkably softened and reduced its compressive yield strength to almost 50% of the initial values. Additionally, the total creep strain of the casting reference material was almost three times higher than that of the Al-7Fe-5Ni alloy. It has been proven that centrifugally atomised materials quickly compacted via hot extrusion can compete or even exceed the properties of common casting aluminium alloys that are used in automotive industry.
机译：在这项工作中，研究了通过包括离心雾化和热挤压在内的新技术制备的Al-12Fe和Al-7Fe-5Ni（wt％）合金。使用光学显微镜，电子扫描显微镜，透射电子显微镜和X射线衍射研究了显微结构。机械性能通过维氏硬度测量和压缩应力-应变测试确定。为了研究热稳定性，还在300℃和400℃退火100 h后测量了机械性能。另外，在120 MPa的应力和300℃的温度下进行了蠕变测试。所研究的材料由细晶粒的α-Al和金属间相组成，分别为Al_（13）Fe_4和Al_9FeNi。对于Al-12Fe合金，维氏硬度和压缩屈服强度分别为68 HV5和183 MPa，对于Al-7Fe-5Ni合金，分别为73 HV5和226 MPa。长期退火后，机械性能的变化可忽略不计，表明两种材料均具有出色的热稳定性。蠕变测试证实了Al-7Fe-5Ni合金具有最高的热稳定性，其总压缩蠕变应变为15％。通过T6方式处理的“热稳定”铸造Al-12Si-1Cu-1Mg-1Ni合金用作参考材料。铸造合金在室温下表现出足够的机械性能（硬度和压缩屈服强度）。然而，退火显着软化并将其压缩屈服强度降低至初始值的近50％。另外，铸造参考材料的总蠕变应变几乎是Al-7Fe-5Ni合金的三倍。已经证明，通过热挤压快速压实的离心雾化材料可以与甚至超过汽车行业中常用的铸造铝合金性能相媲美。

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  • 来源
    《Materials Science and Engineering》 |2014年第6期|141-149|共9页
  • 作者

    F. Prusa; D. Vojtech; A. Michalcova; I. Marek;

  • 作者单位

    Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Prague, Technicka 5, 166 28 Prague 6, Czech Republic;

    Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Prague, Technicka 5, 166 28 Prague 6, Czech Republic;

    Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Prague, Technicka 5, 166 28 Prague 6, Czech Republic;

    Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Prague, Technicka 5, 166 28 Prague 6, Czech Republic;

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  • 正文语种 eng
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  • 关键词

    Aluminium; Rapid solidification; Centrifugal atomisation; Hardness; Thermal stability; Creep;

    机译：铝;快速凝固;离心雾化硬度;热稳定性;蠕变;

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