Analysis of Stored Energy in Cold-Rolled Copper Using Bulk and Microstructure-Based Techniques
Analysis of Stored Energy in Cold-Rolled Copper Using Bulk and Microstructure-Based Techniques
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DOI：
10.1007/s40195-016-0389-y
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发表时间：
2016-02
期刊：
影响因子：
--
通讯作者：
S. Deng;A. Godfrey;Wei Liu
中科院分区：
文献类型：
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作者：
S. Deng;A. Godfrey;Wei Liu
利用差示扫描量热法（DSC）和透射电子显微镜（TEM）的显微结构参数测量，获得了0.42和5.21之间的von Mises应变冷轧铜样品的存储能量。在这两种情况下，发现存储能量随应变呈线性增加。然而，两个测量值之间的比率在一个很大的范围内变化，这表明在确定给定样品中与变形微观结构非均质性相关的能量相对差时需要一些谨慎。存储能量与流动应力的比较表明，基于tem的测量反映了导致流动应力的位错密度含量，但DSC技术还测量了其他对存储能量的贡献，例如平衡内应力的存在。
Measurements of stored energy have been obtained for samples of copper cold-rolled to von Mises strains between 0.42 and 5.21 using both differential scanning calorimetry (DSC), and based on measurements of microstructural parameters in the transmission electron microscope (TEM). In both cases, a linear increase in stored energy with strain is found. The ratio between the two measured values varies, however, over a significant range, indicating that some caution is needed in determining the relative difference in energy associated with deformation microstructure heterogeneities in a given sample. Comparison of the stored energy with the flow stress suggests that the TEM-based measurements reflect the dislocation density content responsible for the flow stress, but that the DSC technique additionally measures other contributions to the stored energy, such as the presence of balanced internal stresses.