Twin boundaries showing very large deviations from the twinning plane

SCRIPTA MATERIALIA

卷:67

Article

Zhang, X. Y.²  Li, B.¹  Wu, X. L.^3,4  Zhu, Y. T.²  Ma, Q.¹  Liu, Q.²  Wang, P. T.¹  Horstemeyer, M. F.^1,5 

[1] Mississippi State Univ, Ctr Adv Vehicular Syst, Mississippi State, MS 39762 USA

[2] Chongqing Univ, Sch Mat Sci & Engn, Chongqing, Peoples R China

[3] Chinese Acad Sci, State Key Lab Nonlinear Mech & Mat, Inst Mech, Beijing 100864, Peoples R China

[4] Chinese Acad Sci, Mech Res Ctr, Inst Mech, Beijing 100864, Peoples R China

[5] Mississippi State Univ, Dept Mech Engn, Mississippi State, MS 39762 USA

关键词: Twin;    Twin boundary;    Deformation twinning;    Cobalt;    Magnesium;   

DOI  :  10.1016/j.scriptamat.2012.08.012

来源: Elsevier

【 摘 要 】

In deformation twinning, twin boundaries (TBs) should coincide with the twinning plane. Here we show that the TBs of the most common twinning mode in hexagonal close-packed metals, {1 0 (1) over bar 2}< 1 0 (1 1) over bar >, may not lie on the {1 0 (1) over bar 2} twinning plane. Examinations using transmission electron microscopy (TEM) reveal that the TBs in Co and Mg deviate significantly from the {1 0 (1) over bar 2} plane. High-resolution TEM confirms that the incoherent TBs entirely depart from the twinning plane with a magnitude greater than 45 degrees. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free