In Situ Observation of Deformation in Semi-solid Fe-C Alloys at High Shear Rate
In Situ Observation of Deformation in Semi-solid Fe-C Alloys at High Shear Rate
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DOI：
10.1007/s11661-014-2489-5
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
T. Nagira;S. Morita;Hiroyoshi Yokota;H. Yasuda;C. Gourlay;M. Yoshiya;A. Sugiyama;K. Uesugi;A. Takeuchi;Yoshio Suzuki
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文献类型：
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作者：
T. Nagira;S. Morita;Hiroyoshi Yokota;H. Yasuda;C. Gourlay;M. Yoshiya;A. Sugiyama;K. Uesugi;A. Takeuchi;Yoshio Suzuki
同步加速器X射线照相术以每秒125帧的速度用于研究半固态Fe-C合金在高固体分数和10−1/s剪切应变速率下的变形机制。图像相关的方法也被用来量化的剪切应变场和研究剪切引起的膨胀和剪切开裂的起源。结果表明，在高固体分数（90至93%固体），重排，包括旋转和平移的固体颗粒成为限制和剪切应变局部化到狭窄的液体填充的通道/裂缝。剪切开裂被证明是源于不充分的液体流入膨胀的固体颗粒之间的空间所造成的剪切诱导膨胀。在较低的固体分数（~ 85%固体），固体颗粒重排的旋转导致更多的剪切诱导的扩张和更宽的剪切带的显着更高的组件。
Synchrotron X-ray radiography at 125 frames per second was used to study deformation mechanisms in semi-solid Fe-C alloys at high solid fraction and shear strain rates of 10−1/s. An image correlation approach was also used to quantify the shear strain fields and study shear-induced dilation and the origin of shear cracking. It was shown that, at high solid fraction (90 to 93 pct solid), rearrangement including rotation and translation of solid particles became restricted and shear strain localized into narrow liquid-filled channels/fissures. Shear cracking was shown to originate from inadequate liquid flow into the expanding spaces between solid particles caused by shear-induced dilation. At lower solid fraction (~85 pct solid), solid particles rearranged with a significantly higher component of rotation leading to more shear-induced dilation and a wider shear band.