期刊
MATERIALS CHARACTERIZATION
卷 107, 期 -, 页码 167-173出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.07.009
关键词
Microstructural stability; AZ91 magnesium alloy; Equal channel angular pressing (ECAP); Kernel average misorientation (KAM); Electron backscatter diffraction (EBSD)
类别
资金
- European Regional Development Fund in the framework of the research project NETME Centre under the Operational Program Research and Development for Innovation [CZ.1.5/2.1.00/01.002]
- [FSI-S-11-14]
- [22172]
The changes in microstructure of equal channel angular pressing (ECAP) processed magnesium alloy AZ91 during thermal exposure were studied in this paper. The microstructure stability was investigated by means of electron backscatter diffraction (EBSD), which allowed to measure the changes in grain size, mutual ratio of low-angle boundaries (LABs) to high-angle ones (HABs) and local lattice distortion evaluated by the kernel average misorientation (KAM) parameter. It was found experimentally that the threshold temperature at which significant grain coarsening takes place is 350 degrees C. No modification to mean grain diameter occurs below this temperature, nonetheless, some changes in LAB and HAB fraction, as well as in local lattice distortion, can be observed. (C) 2015 Elsevier Inc. All rights reserved.
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