Application of a macroscopic model to predict the band segregation induced by shear deformation of semisolid
Application of a macroscopic model to predict the band segregation induced by shear deformation of semisolid
复制标题
应用宏观模型预测半固体剪切变形引起的能带偏析
DOI：
10.1088/1757-899x/84/1/012011
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Morita S
中科院分区：
文献类型：
--
作者：
Morita S
铸造过程中的半固态变形会导致铸件出现带状偏析等缺陷。由于缺陷的形成源于半固态的性质，因此建立一个包含缺陷性质的模型并对缺陷的形成进行预测是很有意义的。原位和时间分辨X射线成像证明，半固态中固体颗粒的重排控制变形，剪切应变局部化导致带状偏析。在此基础上，提出了一个显式考虑重排的宏观模型。该模型采用两相流模型，并引入静水应力来表示重排过程。将该模型应用于半固态材料的简单剪切，以确定其抗剪切不稳定性。固相分数波动逐渐增大，剪切变形局部化。该模型也适用于剪切室中的拟二维变形，其尺寸与X射线成像中使用的尺寸相同。计算结果与实验结果定性吻合。结果表明，该模型具有较好的模拟剪切局部化和带状偏析的潜力。为了进一步改进，需要测量与重排密切相关的一些物理性质。
Semisolid deformation during solicitation can cause some casting defects such as the band segregation. Since the defect formation originates in nature of semisolid, it is of interest to build a model including the nature and to predict the defect formation. In-situ and time-resolve X-ray imaging has proved that rearrangement of solid grains in semisolid dominantly controls deformation and localization of shear strain leads to the band segregation. On the basis of the observations, a macroscopic model, which explicitly includes the rearrangement, is proposed. The model uses two-phase flow model and introduces hydrostatic stresses to express the rearrangement. The model was applied to simple shear of semisolid to confirm instability against shear. Fluctuation of solid fraction gradually increased and consequently shear deformation was localized. The model is also applied to pseudo 2D deformation in a shear cell, of which dimension was the same as that used in the X-ray imaging. The calculation result qualitatively agreed with the experimental results. It was concluded that the model has a potential to simulate the localization of shear and the band segregation. For further improvement, to measure some physical properties, which are closely related to the rearrangement, is required.
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半固态铝合金和钢剪切诱发膨胀的同步辐射照相研究
影响因子：
2.6
作者：
Gourlay C
通讯作者：
Gourlay C
DOI：
10.1007/s11661-014-2489-5
发表时间：
2014-08
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
T. Nagira;S. Morita;Hiroyoshi Yokota;H. Yasuda;C. Gourlay;M. Yoshiya;A. Sugiyama;K. Uesugi;A. Takeuchi;Yoshio Suzuki
通讯作者：
T. Nagira;S. Morita;Hiroyoshi Yokota;H. Yasuda;C. Gourlay;M. Yoshiya;A. Sugiyama;K. Uesugi;A. Takeuchi;Yoshio Suzuki
影响因子：
3.7
作者：
Hunt, ML;Zenit, R;Brennen, CE
通讯作者：
Brennen, CE
影响因子：
9.4
作者：
Gourlay, C. M.;Dahle, A. K.;Yasuda, H.
通讯作者：
Yasuda, H.
影响因子：
1.8
作者：
Koreaki Suzuki;Takehiro Miyamoto
通讯作者：
Takehiro Miyamoto