期刊
MATERIALS CHARACTERIZATION
卷 155, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2019.109834
关键词
Fine grains; Dynamic recrystallization; Dislocation slip; Grain boundary sliding; TiB2 particles
类别
资金
- National Key Research and Development Program of China [2016YFB1100103]
- Conseil Regional du Nord-Pas de Calais
- European Regional Development Fund (ERDF)
The microstructure evolution near the central axis during hot extrusion for the fine-grained TiB2/Al-Zn-Mg-Cu composites fabricated by powder metallurgy is studied by experimental observation at different locations in the remaining die. The significant increase of the fraction of ultrafine grains and texture evolution indicates the extensive dynamic recrystallization at the narrowest position of the die. The deformed grains are distinguished from the undeformed grains with the parameter of grain orientation spread (GOS). And the deformed grains are generally rotated around the extrusion direction. Additionally, the introduced submicron TiB2 particles have the potential to stimulate the dynamic recrystallization associated with progressively increased misorientation of subgrain boundaries, and even change the spatial distribution of the low angle grain boundaries. The preferential activation of {111} < 1-10 > system and non-octahedral (NOC) slip system {001} < 110 > contributes to the formation of strong deformation fiber texture according to the analysis of the Schmid factor. It is supposed that grain boundary sliding accommodated dislocation slip mechanism controls the microstructure evolution.
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