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首页> 美国卫生研究院文献>Materials >Creep of Polycrystalline Magnesium Aluminate Spinel Studied by an SPS Apparatus
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Creep of Polycrystalline Magnesium Aluminate Spinel Studied by an SPS Apparatus

机译：用SPS装置研究多晶铝酸镁尖晶石的蠕变

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摘要

A spark plasma sintering (SPS) apparatus was used for the first time as an analytical testing tool for studying creep in ceramics at elevated temperatures. Compression creep experiments on a fine-grained (250 nm) polycrystalline magnesium aluminate spinel were successfully performed in the 1100–1200 °C temperature range, under an applied stress of 120–200 MPa. It was found that the stress exponent and activation energy depended on temperature and applied stress, respectively. The deformed samples were characterized by high resolution scanning electron microscope (HRSEM) and high resolution transmission electron microscope (HRTEM). The results indicate that the creep mechanism was related to grain boundary sliding, accommodated by dislocation slip and climb. The experimental results, extrapolated to higher temperatures and lower stresses, were in good agreement with data reported in the literature.
机译：火花等离子体烧结（SPS）设备首次用作分析测试工具，用于研究高温下陶瓷的蠕变。在1100–1200°C的温度范围内，在120–200 MPa的施加应力下，成功进行了细晶粒（250 nm）多晶铝酸镁尖晶石的压缩蠕变实验。发现应力指数和活化能分别取决于温度和施加的应力。通过高分辨率扫描电子显微镜（HRSEM）和高分辨率透射电子显微镜（HRTEM）对变形样品进行表征。结果表明，蠕变机理与晶界滑动有关，由位错滑移和爬升调节。外推到较高温度和较低应力的实验结果与文献报道的数据非常吻合。

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