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首页> 美国卫生研究院文献>Materials >Effect of TiB Orientation on Near-Threshold Fatigue Crack Propagation in TiB-Reinforced Ti-3Al-2.5V Matrix Composites Treated with Heat Extrusion
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Effect of TiB Orientation on Near-Threshold Fatigue Crack Propagation in TiB-Reinforced Ti-3Al-2.5V Matrix Composites Treated with Heat Extrusion

机译：TiB取向对热挤压处理的TiB增强Ti-3Al-2.5V基体复合材料近阈疲劳裂纹扩展的影响

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摘要

TiB-reinforced Ti-3Al-2.5V matrix composites, in which TiB whiskers are oriented parallel to the direction of heat extrusion, were fabricated via mechanical alloying and hot isostatic pressing (HIP). To investigate the near-threshold fatigue crack propagation in TiB-reinforced Ti-3Al-2.5V matrix composites, stress intensity factor -decreasing tests were conducted for disk-shaped compact specimens having two different orientations of TiB whiskers at force ratios from 0.1 to 0.8 under ambient conditions. The crack growth rates, d /d , for the composites incorporating TiB whiskers oriented perpendicular to the direction of crack growth were constantly lower than those obtained in the case where the orientation was parallel at the same stress intensity range Δ , while the threshold stress intensity range, Δ , was higher. This effect can be explained by the increase in the degree of roughness-induced crack closure resulting from the perpendicular TiB, because fatigue cracks preferentially propagated across the boundaries between the matrix and the TiB in certain regions. In contrast, the effective threshold stress intensity range, Δ , for composites was unaffected by the TiB orientation at low force ratios.
机译：通过机械合金化和热等静压（HIP）制备了TiB增强的Ti-3Al-2.5V基复合材料，其中TiB晶须的取向平行于热挤压的方向。为了研究TiB增强的Ti-3Al-2.5V基复合材料的近阈疲劳裂纹扩展，对具有两种不同取向的TiB晶须的圆盘形致密样品进行了应力强度因子降低测试，力比范围为0.1至0.8在环境条件下。垂直于裂纹扩展方向取向的掺有TiB晶须的复合材料的裂纹扩展速率d / d始终低于在相同应力强度范围Δ取向平行的情况下获得的裂纹扩展速率d / d，而阈值应力强度范围Δ较高。可以用垂直TiB引起的粗糙度引起的裂纹闭合程度的增加来解释这种影响，因为疲劳裂纹优先在某些区域内穿过基体和TiB之间的边界传播。相反，复合材料的有效阈值应力强度范围Δ在低力比下不受TiB取向的影响。

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