TY - JOUR
T1 - Crystallographic characters of {11¯22} twin-twin junctions in titanium
AU - Xu, Shun
AU - Gong, Mingyu
AU - Xie, Xinyan
AU - Liu, Yue
AU - Schuman, Christophe
AU - Lecomte, Jean Sébastien
AU - Wang, Jian
N1 - Publisher Copyright:
© 2017 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2017/11/2
Y1 - 2017/11/2
N2 - (Formula presented.) contraction twins that are commonly activated in α-titanium interact to each other and form three types of twin–twin junctions (CI i,i+1, CI i,i+2, CI i,i+3 TTJs) corresponding to the crystallography of six twin variants CI i (i = 1,2, …, 6). We detected 243 (Formula presented.) TTJs in rolled pure α-titanium sheets. Electron backscatter diffraction analysis reveals that CI i,i+1 TTJs are profuse, 79.8% among three types while CI i,i+2 and CI i,i+3 TTJs take up 17.7 and 2.5%. Twin transmission does not occur. Consequently, boundaries associated with twin–twin interactions block twin propagation and influence twin growth. We explain structural features of TTJs according to the Schmid factor analysis and the reaction mechanism of twinning dislocations. The knowledge regarding TTJs provides insight for improving the predictive capability of meso/macro-scale crystal plasticity models for hexagonal metals.
AB - (Formula presented.) contraction twins that are commonly activated in α-titanium interact to each other and form three types of twin–twin junctions (CI i,i+1, CI i,i+2, CI i,i+3 TTJs) corresponding to the crystallography of six twin variants CI i (i = 1,2, …, 6). We detected 243 (Formula presented.) TTJs in rolled pure α-titanium sheets. Electron backscatter diffraction analysis reveals that CI i,i+1 TTJs are profuse, 79.8% among three types while CI i,i+2 and CI i,i+3 TTJs take up 17.7 and 2.5%. Twin transmission does not occur. Consequently, boundaries associated with twin–twin interactions block twin propagation and influence twin growth. We explain structural features of TTJs according to the Schmid factor analysis and the reaction mechanism of twinning dislocations. The knowledge regarding TTJs provides insight for improving the predictive capability of meso/macro-scale crystal plasticity models for hexagonal metals.
KW - Twin
KW - dislocation
KW - electron backscatter diffraction
KW - titanium
UR - http://www.scopus.com/inward/record.url?scp=85038083147&partnerID=8YFLogxK
U2 - 10.1080/09500839.2017.1402132
DO - 10.1080/09500839.2017.1402132
M3 - Article
AN - SCOPUS:85038083147
SN - 0950-0839
VL - 97
SP - 429
EP - 441
JO - Philosophical Magazine Letters
JF - Philosophical Magazine Letters
IS - 11
ER -