EVOLUTION OF DISLOCATION-STRUCTURES AND DEFORMATION-BEHAVIOR OF IRON AT DIFFERENT TEMPERATURES .2. DISLOCATION DENSITY AND THEORETICAL-ANALYSIS
EVOLUTION OF DISLOCATION-STRUCTURES AND DEFORMATION-BEHAVIOR OF IRON AT DIFFERENT TEMPERATURES .2. DISLOCATION DENSITY AND THEORETICAL-ANALYSIS
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DOI：
10.1007/bf02801172
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发表时间：
1992-02-01
期刊：
影响因子：
--
通讯作者：
DAHL, W
中科院分区：
文献类型：
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作者：
LAN, Y;KLAAR, HJ;DAHL, W
通过透射电子显微镜 (TEM) 检查了在 173 K 和室温下变形的铁中位错密度的演变。 在室温下，随着变形进展到大应变，细胞壁中的位错密度增加，而在细胞内部，密度逐渐趋向饱和值。 在 173 K 和室温下，流变应力与总位错密度的平方根之间都存在线性关系。 根据考虑变形过程中位错分布的模型讨论了变形行为对位错结构演化的依赖性。 使用该模型的计算结果与室温下的实验曲线的比较显示出良好的一致性。 不同温度下变形行为的变化可以通过温度对位错分布演化的影响来描述。
The evolution of dislocation density in iron deformed at 173 K and at room temperature has been examined by transmission electron microscopy (TEM). At room temperature, the dislocation density in the cell walls increases as the deformation progresses up to large strains, whereas in cell interiors, the density evolves toward a saturation value. A linear relationship exists between the flow stress and the square root of total dislocation density both at 173 K and room temperature. The dependence of deformation behavior on the evolution of dislocation structures is discussed in terms of a model considering the dislocation distribution during deformation. Comparison of the calculated result using this model with the experimental curve at room temperature gives excellent agreement. The changes of deformation behaviors at different temperatures can be described by the effect of temperature on the evolution of dislocation distribution.