物理学报2017，Vol.66Issue(8)：263-272,10.DOI:10.7498/aps.66.086201
基于数字图像相关法的Mg含量对Al合金 Protein-Le Chatelier效应影响的实验研究
Exp erimental investigation on the influence of Mg content on Portevin-Le Chatelier effect in Al-based alloys by using digital image correlation
摘要
Abstract
The Protein-Le Chatelier (PLC) effects are investigated by using digital image correlation at a constant applied strain rate of 5.00×10?3 s?1 and room temperature in Al-Mg alloys with Mg content values (wt.%) of 2.30, 4.57, 6.10 and 6.91 respectively in this study. Both the yield strength and the ultimate strength increase with increasing Mg content, which is generally called solution strengthening. Type of PLC band changes from A to B with increasing Mg content. In low Mg content (2.30%) alloy, the serration amplitude almost remains 1 MPa, while in each of high Mg content (4.57%, 6.10%, 6.91%) alloys it linearly increases with the strain increasing. The serration amplitude is found to increase with increasing Mg content and gradually reaches a saturated state. With the increase of Mg content, the period of PLC band for continuous propagation gradually reduces and the time when the PLC band location sudden jumps increases in the process of propagation. When the strain is small, the out-of-band deformation of alloy is inhomogeneous obviously. And the deformation inhomogeneity slightly decreases with increasing Mg content. DIC results indicate that the PLC bandwidth does not change with Mg content, while the maximum strain increment in the PLC band increases with increasing both Mg content and strain. Additionally, special periodic damped serrations are observed in the stress-time curve of the low Mg content (2.30%), the corresponding PLC band shows that the periodic changed serrations in the stress-time curve correspond to the transformation of the PLC band orientation. Besides, the PLC band propagates upward continuously both before and after the shift.关键词
Portevin-Le Chatelier效应/数字图像相关法/Mg含量/动态应变时效Key words
Portevin-Le Chatelier/digital image correlation/Mg content/dynamic strain ageing引用本文复制引用
杨素丽,符师桦,蔡玉龙,张迪,张青川..基于数字图像相关法的Mg含量对Al合金 Protein-Le Chatelier效应影响的实验研究[J].物理学报,2017,66(8):263-272,10.基金项目
国家自然科学基金(批准号:11332010,11627803,11472266,11428206,51571013)和中国科学院战略性研究计划(批准号:DB22040502)资助的课题. Project supported by the National Natural Science Foundation of China (Grant Nos.11332010,11627803,11472266,11428206,51571013) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.DB22040502). （批准号:11332010,11627803,11472266,11428206,51571013）
