Origin of Surface Dislocation Density Profile Developed During Cyclic Straining

本研究对阿尔法黄铜近表面区通过循环应变形成的位错结构进行了为期三年的研究。这项基础研究探索了高位错密度阵列的演化以及这些阵列与持久滑移带形成的关系。通过改变锌含量来探讨层错能在这一过程中的作用。包辛格应力和残余应力将作为塑性应变的函数进行研究。这项研究的结果将有助于更好地了解疲劳裂纹的萌生。

This research involves a three years study of dislocation structures developed in the near-surface regions of alpha brass by cyclic straining. This basic research explores the evolution of high dislocation density arrays and the relationship of these arrays to persistent slip band formation. The role of stacking fault energy in this process will be explored by varying the zinc content. Bauschinger and residual stresses will be studied as a function of plastic strain. The results of this research will allow development of a better understanding of fatigue crack initiation.