粗晶和超细晶钛的电塑性效应

V. Stolyarov
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引用次数: 0

摘要

在塑性变形过程中,电流的外部作用的一个众所周知的特征是电塑性效应,表现为流动应力的降低和塑性(变形能力)的增加。了解电塑性效应的本质可以提供有针对性的调节和应用,以提高金属加工过程的效率或改变材料的结构和性能。研究了工业纯钛在临界密度为12 ~ 400 A/mm2的电流作用下的变形行为。研究了粗晶(d = 50 μm)和超细晶(d = 500 nm) VT1-0钛合金在拉伸变形和单脉冲、多脉冲和直流模式下的电塑性效应。结果表明,晶粒尺寸的减小不仅能提高材料的强度特性,还能降低电塑性效应,其作用机制与移动位错密度密切相关。结果表明,钛的电塑性效应的表现受晶粒尺寸的控制,晶粒尺寸的减小导致钛的电塑性降解,最终由于自由位错密度的减小而完全消失在非晶态。
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The electroplastic effect in coarse-grained and ultrafine-grained titanium
One of the well-known features of the external action of the electric current in the process of plastic deformation is the electroplastic effect manifesting in a decrease in flow stresses and an increase in plasticity (deformability). Understanding the nature of the electroplastic effect provides targeted regulation and application of the effect to improve the efficiency of metal working processes or to change the structure and properties of materials. The deformation behavior of commercially pure titanium under the impact of an electric current of critical density from 12 to 400 A/mm2 is considered. The electroplastic effect in coarse-grained (d = 50 μm) and ultrafine-grained (d = 500 nm) VT1-0 titanium has been studied under a combination of tensile deformation and applied current of various modes and regimes, including the single-pulse, multipulse and direct current modes. It is shown that a decrease in the grain size contributes not only to an increase in the strength characteristics, but also to a decrease in the electroplastic effect, the mechanism of which is closely related to the density of mobile dislocations. It has been shown that the manifestation of the electroplastic effect in titanium is controlled by the grain size, and a decrease in the grain size leads to its electroplastic degradation and finally to the complete disappearance in the amorphous state due to a decrease in the density of free dislocations.
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