Diffusion creep of anorthite‐quartz aggregates
Diffusion creep of anorthite‐quartz aggregates
复制标题
钙长石-石英聚集体的扩散蠕变
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Dresen
中科院分区：
文献类型：
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作者：
X. Xiao;R. Wirth;G. Dresen
[1]我们研究了由钙长石和0-75wt%石英组成的合成两相骨料的塑性流动。在温度为1173-1473K，应变速率为10−7-10−4 S−1，围压为0.1Mpa和300Mpa时，骨料以晶界扩散蠕变为主。集合体的强度随着石英颗粒含量的增加而增加，石英颗粒表现为几乎刚性的包裹体。变形压力为0.1Mpa的试件比围压为300 Mpa的试件具有更明显的强化作用。基于自洽连续介质模型的复合材料强度预测值与石英分数为5000 H/106Si、围压为300 Mpa的单轴实验数据符合得很好，并与观察到的微观结构相一致。透射电子显微镜观察表明，石英颗粒周围的局部变形梯度主要发生在大气压下变形的样品中。
[1] We investigated plastic flow of synthetic two-phase aggregates composed of anorthite and 0–75 wt % quartz. The aggregates deform predominantly by grain boundary diffusion creep at temperatures of 1173–1473 K, strain rates of 10−7–10−4 s−1, and at confining pressure of 0.1 and 300 MPa. Strength of the aggregates increases with increasing content of quartz particles that behave as almost rigid inclusions. Strengthening is more pronounced for samples deformed at 0.1 MPa than at 300 MPa confining pressure. Predictions of composite strength based on self-consistent continuum models are in good agreement with the experimental data from uniaxial experiments at quartz fractions 5000 H/106Si at 300 MPa confining pressure in agreement with observed microstructures. Transmission electron microscope observations indicate local gradients in deformation around quartz particles dominantly in samples deformed at atmospheric pressure.