空气加热铝铬粉末压坯的结构转变

G. A. Pribytkov, V. Korzhova, E. Korosteleva
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引用次数: 1

摘要

在本研究中,考虑了铝铬粉末在500°C空气中暴露时的结构变化。样品是由铝和铬粉的混合物压制而成的。利用x射线衍射和金相分析以及测量样品的增重进行了研究。结果表明,由于粉末混合物中的相变,Al-Cr压坯的初始孔隙率与比质量增益的关系是复杂而模糊的。在短期内(最多30分钟)500°C的空气加热多孔压坯不会发生明显的氧化。然而,在500℃下长期暴露,铝和铬之间发生反应扩散,导致Al13Cr2金属间形成和致密物膨胀。在本研究中,考虑了铝铬粉末在500°C空气中暴露时的结构变化。样品是由铝和铬粉的混合物压制而成的。利用x射线衍射和金相分析以及测量样品的增重进行了研究。结果表明,由于粉末混合物中的相变,Al-Cr压坯的初始孔隙率与比质量增益的关系是复杂而模糊的。在短期内(最多30分钟)500°C的空气加热多孔压坯不会发生明显的氧化。然而,在500℃下长期暴露,铝和铬之间发生反应扩散,导致Al13Cr2金属间形成和致密物膨胀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural transformations in air heated Al-Cr powder compacts
In this study, structural changes in aluminum-chromium powder compacts were considered during exposure in the air at 500 °C. The samples were obtained by pressing the mixture of aluminum and chromium powders. The studies were carried out with using the X-ray diffraction and the metallographic analysis and by measuring the weight gain of the samples. It was established that the value of the specific mass gain has a complex and ambiguous dependence on the initial porosity of Al-Cr compacts due to phase transformations in powder mixtures. At short-term (up to 30 minutes) 500 °C air heating of the porous compacts significant oxidation does not occur. However, at the long-term exposure at 500 °C the reaction diffusion between aluminum and chromium occurs resulting in Al13Cr2 intermetallic formation and compacts swelling.In this study, structural changes in aluminum-chromium powder compacts were considered during exposure in the air at 500 °C. The samples were obtained by pressing the mixture of aluminum and chromium powders. The studies were carried out with using the X-ray diffraction and the metallographic analysis and by measuring the weight gain of the samples. It was established that the value of the specific mass gain has a complex and ambiguous dependence on the initial porosity of Al-Cr compacts due to phase transformations in powder mixtures. At short-term (up to 30 minutes) 500 °C air heating of the porous compacts significant oxidation does not occur. However, at the long-term exposure at 500 °C the reaction diffusion between aluminum and chromium occurs resulting in Al13Cr2 intermetallic formation and compacts swelling.
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