Al-Cu-Mg合金的预变形、位错密度与位错强化的定量研究.pdf

Material Sciences 材料科学, 2015, 5, 126-133 Published Online May 2015 in Hans. /journal/ms /10.12677/ms.2015.53018 The Quantitative Research of Deformation, Dislocation Density and Dislocation Strengthening in Al-Cu-Mg Alloy 1 2,3 1,3* 1 Chenqi Lei , Jin Zhang , Yunlai Deng , Ming’an Chen 1 School of Materials Science and Engineering, Central South University, Changsha Hunan 2 Light Alloy Research Institute, Central South University, Changsha Hunan 3 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha Hunan * Email: luckdeng@ th th th Received: May 4 , 2015; accepted: May 20 , 2015; published: May 27 , 2015 Copyright © 2015 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract The quantitative research of deformation, dislocation density and aging strengthening in Al-Cu-Mg alloy during artificial aging was studied by tensile test, X-ray diffractometry (XRD) and transmis- sion electron microscopy (TEM). The results indicate that the pre-deformation increased the dis- location density of the alloy hot-rolled plate, refined the size of precipitated phase, improved the strength of alloy and reduced the time of peak aging. The dislocation density measured by TEM line intersection method and XRD profile method becomes higher with the increase of predefor- mation and the increase rate is gradually decreased. Finally it tends to saturation, and the function model of dislocation density