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Effect of simulated combustion atmospheres on oxidation and microstructure evolution of aluminum alloy 5052

机译：模拟燃烧气氛对铝合金5052氧化和组织演变的影响

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摘要

Among the common materials, metals can be hardly destroyed by flame or the heat emanating from a normal fire. Consequently, investigation on the thermal patterns produced on metallic objects after fire exposure can provide important physical evidence for fire cause/origin determination. Aluminum alloy is widely used in our daily life and the industry; hence, it can be easily found on a domestic or industrial fire scene. In this paper, the aluminum alloy 5052 was exposed in the simulated combustion gases with and without kerosene in the range of 300 to 500 degrees C. Mass change, morphologies, and microstructures of each sample were carefully characterized by thermogravimetric analysis, morphologic observation, and electron microscopy observation with energy-dispersive spectroscopy analysis after exposure. As expected, the microstructure of alloy changed during high temperature exposure. At the same time, an oxide scale formed and was thickened on the surface of alloy. The results reveal that the temperature can significantly affect the growth of oxide scale and the metallurgical microstructure of alloy. It is noteworthy that the presence of kerosene in the combustion gas accelerated oxidation rate and produced oxide scales different from those formed in air. These feature evolutions in surface oxide are expected to offer complementary insight on determining the fire characteristics, such as the exposure temperature, period and whether liquid accelerant is involved.
机译：在普通材料中，金属几乎不会被火焰或正常火势散发的热量破坏。因此，对着火后金属物体上产生的热模式的研究可以为确定起火原因/起源提供重要的物理证据。铝合金广泛应用于我们的日常生活和工业中；因此，可以在家庭或工业火灾现场很容易找到它。在本文中，将铝合金5052暴露在300到500摄氏度范围内的有或没有煤油的模拟燃烧气体中。通过热重分析，形态观察和热重分析来仔细表征每个样品的质量变化，形貌和微观结构。曝光后用能量色散光谱分析进行电子显微镜观察。不出所料，合金的微观结构在高温下会发生变化。同时，在合金表面上形成氧化皮并使其增厚。结果表明，温度可以显着影响氧化皮的生长和合金的金相组织。值得注意的是，燃烧气体中煤油的存在加速了氧化速度，产生的氧化皮与空气中形成的氧化皮不同。预期表面氧化物的这些特征演变将为确定燃烧特性提供补充见解，例如暴露温度，暴露时间以及是否涉及液体促进剂。

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  • 来源
    《Fire and materials》 |2018年第3期|278-285|共8页
  • 作者

    Xie Dongbai; Wang Wen; Lv Shilei; Shan Guo;

  • 作者单位

    Xinjiang Police Coll, Urumqi 830013, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China;

    Xinjiang Police Coll, Urumqi 830013, Peoples R China;

    Xinjiang Police Coll, Urumqi 830013, Peoples R 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    aluminum alloy; fire investigation; metallographic analysis; oxidation;

    机译：铝合金;火灾调查;金相分析;氧化;

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