Coherent strain of Guinier-Preston II zone in an Al-Zn-Mg-Cu alloy

Xiaohu Hou; Jijun Li; Fei Liu; Liangming Yan; Pucun Bai

doi:10.1016/j.micron.2019.102711

Coherent strain of Guinier-Preston II zone in an Al-Zn-Mg-Cu alloy

Micron. 2019 Sep:124:102711. doi: 10.1016/j.micron.2019.102711. Epub 2019 Jul 2.

Authors

Xiaohu Hou¹, Jijun Li², Fei Liu¹, Liangming Yan¹, Pucun Bai³

Affiliations

¹ College of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.
² College of Science, Inner Mongolia University of Technology, Hohhot, 010051, China.
³ College of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China. Electronic address: pcbai@163.com.

PMID: 31280006
DOI: 10.1016/j.micron.2019.102711

Abstract

The Guinier-Preston (GP) II zone in an Al-Zn-Mg-Cu alloy was investigated by using a high-resolution electron microscopy (HREM). We used Geometric Phase Analysis (GPA) technique to measure the experimental HREM image and the simulated HREM image to obtain the strain distribution maps. The results show converging strain fields in the GP II zone, and the maximum compressive strain can reach -7.2% and -6.7%, respectively. The distribution of the experimental strain field was in consistence with that of the simulation result. The average strain of the alloy measured using XRD is 0.191%.

Keywords: Aluminum alloys; High-resolution electron microscopy (HREM); Micromechanical modeling; Strain field.