Residual elastic stress strain field and geometrically necessary dislocation density distribution around nano-indentation in TA15 titanium alloy

作     者：何东 朱景川 来忠红 刘勇 杨夏炜 农智升 Dong HE;Jing-chuan ZHU;Zhong-hong LAI;Yong LIU;Xia-wei YANG;Zhi-sheng NONG

作者机构：哈尔滨工业大学材料科学与工程学院哈尔滨150001 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2013年第23卷第1期

页      面：7-13页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：nano-hardness stress strain fields geometrically necessary dislocation nanoindentation electron backscatter diffraction TA15 titanium alloy 

摘      要：Nanoindentation and high resolution electron backscatter diffraction（EBSD） were combined to examine the elastic modulus and hardness of α and β phases,anisotropy in residual elastic stress strain fields and distributions of geometrically necessary dislocation（GND） density around the indentations within TA15 titanium *** nano-indention tests were conducted on α and β phases,*** residual stress strain fields surrounding the indentation were calculated through crosscorrelation method from recorded *** GND density distribution around the indentation was calculated based on the strain gradient theories to reveal the micro-mechanism of plastic *** results indicate that the elastic modulus and hardness for α p hase are 129.05 GPas and 6.44 GPa,while for β phase,their values are 109.80 GPa and 4.29 GPa,*** residual Mises stress distribution around the indentation is relatively heterogeneous and significantly influenced by neighboring soft β *** region with low residual stress around the indentation is accompanied with markedly high a type and prismatic-GND density.