Faceted interfacial structure of {10(1)over-bar1} twins in Ti formed during equal channel angular pressing

SCRIPTA MATERIALIA

卷:62

Article

Li, Y. J.¹  Chen, Y. J.²  Walmsley, J. C.¹  Mathinsen, R. H.³  Dumoulin, S.¹  Roven, H. J.² 

[1] SINTEF Mat & Chem, N-7465 Trondheim, Norway

[2] NTNU, Dept Mat Sci & Engn, N-7491 Trondheim, Norway

[3] NTNU, Dept Phys, N-7491 Trondheim, Norway

关键词: SPD;    Ti;    Twinning;    HRTEM;    Dislocation;   

DOI  :  10.1016/j.scriptamat.2009.11.039

来源: Elsevier

【 摘 要 】

The boundary structure of {10 (1) over bar1) deformation twins formed in commercially pure titanium during an initial pass of equal channel angular pressing processing has been studied by transmission electron microscopy (TEM) and high-resolution TEM. A new twinning mode with a twinning dislocation of b(3/3) has been identified using a dichromatic diagram method. The new mode of the {10 (1) over bar1} twin has substantially higher interface energy and accommodates more shear strain during deformation than the conventional b(4) twinning mode. The deviation angle between the habit trace of the twin boundary and the theoretical twinning plane, K1, is dependent upon the density of twin dislocations. (C) 2010 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

【 授权许可】

Free