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Twinning activity of pure titanium during rolling at room and cryogenic temperatures was investigated by electron backscattered diffraction (EBSD) technology. Because cryogenic temperature facilitates twin formation, cryogenically processed samples exhibited greater hardness than those processed at room temperature. Schmid factor (SF) analysis of twin variant selection behavior revealed that the variant selection was insensitive to temperature. Both moderate and low SF variants formed, which led to multiple variants within the grain. Furthermore, twin-twin intersections were more likely to occur at cryogenic temperatures due to the coexistence of multiple variants and twin types within a grain. At a strain of 20%, higher-order sequential twinning was common during rolling at cryogenic temperature, indeed, a twinning sequence of CTW-ETW-CTW-ETW by lattice rotation was observed. The formation of low SF and anomalous variants during rolling can be explained by displacement gradient tensors and geometric compatibility factors.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN: 0921-5093
Year: 2021
Volume: 803
6 . 0 4 4
JCR@2021
6 . 1 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:142
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 40
SCOPUS Cited Count: 37
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0