skip to main content

DOE PAGESDOE PAGES

Title: Interface structures and twinning mechanisms of {1¯012} twins in hexagonal metals

In this paper, a controversy concerning the description of {1¯012} {1¯012} twinning, whether it is shear-shuffle or pure glide-shuffle or pure shuffle, has developed. There is disagreement about the interpretation of transmission electron microscopic observations, atomistic simulations and theories for twin growth. In this article, we highlight the atomic-level, characteristic, equilibrium and non-equilibrium boundaries and corresponding boundary defects associated with the three-dimensional ‘normal’, ‘forward’ and ‘lateral’ propagation of {1¯011} growth/annealing and deformation twins. Although deformation twin boundaries (TBs) after recovery exhibit some similarity to growth/annealing TBs because of the plastic accommodation of stress fields, there are important distinctions among them. These distinctions distinguish among the mechanisms of twin growth and resolve the controversy. In addition, a new type of disconnection, a glide disclination, is described for twinning. Synchroshear, seldom considered, is shown to be a likely mechanism for {1¯012} twinning.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Shanghai Jiao Tong Univ., Shanghai (People's Republic of China)
  4. Shanghai Jiao Tong Univ., Shanghai (People's Republic of China)
Publication Date:
Report Number(s):
LA-UR-17-24219
Journal ID: ISSN 2166-3831
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Materials Research Letters
Additional Journal Information:
Journal Volume: 5; Journal Issue: 7; Journal ID: ISSN 2166-3831
Publisher:
Taylor and Francis
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; twin; boundary; disclination; synchroshear; hexagonal materials
OSTI Identifier:
1369211