Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 688, Issue -, Pages 280-288Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.02.008
Keywords
Mg-Gd-Y-Zr alloy; New fine grains (NFGs); Hot deformation; Annealing; Grain growth; Texture
Categories
Funding
- National Science Foundation of China [51474241]
- National Key Basic Research Program of China [2013CB632204]
Ask authors/readers for more resources
The microstructure and texture development of a cast Mg-Gd-Y-Zr alloy during hot deformation and subsequent annealing were investigated by optical microscopy (OM) and electron backscattered diffraction (EBSD) technology. Initial microstructures with partially and fully developed new fine grains (NFGs), separately attended by continuous or interrupted hot forging, were various mixed grain structures composed of NFGs in necklace and retained coarse grains. It is shown that, during annealing, the development of grain size can be divided into three stages: i.e. an incubation of grain growth, a rapid coarsening and a normal grain growth. After a long time annealing of over 10(4) ks at 693 K, the average grain size for samples continuous compressed to epsilon=1.2 and those interrupted compressed to epsilon=1.6 were close. Moreover, orientations of such strain -induced fine grains were relatively randomly distributed, leading to a weakened basal texture, while the basal plane of retained coarse grains were perpendicular to the forging direction. Such texture even became weaker during subsequent annealing. The results show that the development of necklace NFGs during hot deformation can be effective for homogeneous grain refinement under subsequent annealing.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available