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分析了冷轧体心立方金属中微带的形成原因。基于塑性变形理论,运用Taylor模型和Bishop&Hill最大功原理,计算了变形体心立方晶体中滑移系上的切应变分布计算结果表明,冷轧时当晶粒的轧向平行于晶粒的某些特定取向时,大量的局部切应变将集中产生在一个滑移面上并在此形成微带。这一高度局域性的切应变是形成剪切带的原因。此时,剪切带与轧制方向之间夹角为30°。另外,微带呈片状是双交滑移的结果,透射电子显微镜观察到的剪切带所在晶粒的取向和所在滑移面证实了这一微带的形成机制。
The reasons for the formation of microstrip in the cold-rolled core metal were analyzed. Based on the theory of plastic deformation, the Taylor strain model and Bishop & Hill maximum work principle are used to calculate the shear strain distribution on the slip system in distorted cubic body. The results show that when the rolling direction is parallel to some of the grains during cold rolling, In a particular orientation, a large number of localized shear strains will concentrate on one slip plane and form a microstrip here. This highly localized shear strain is responsible for the formation of shear bands. In this case, the angle between the shear band and the rolling direction is 30 °. In addition, the microstrip flake is the result of double cross-slip. The orientation of the grain where the shear band is observed by the transmission electron microscope and the sliding surface where the shear band is located confirm the formation mechanism of this microstrip.