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

Journal Article · · Materials Research Letters
 [1];  [2];  [3];  [4];  [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)

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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1369211
Report Number(s):
LA-UR--17-24219
Journal Information:
Materials Research Letters, Journal Name: Materials Research Letters Journal Issue: 7 Vol. 5; ISSN 2166-3831
Publisher:
Taylor and FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Three-dimensional character of the deformation twin in magnesium journal July 2019
The surface nucleation of tension twin via pure-shuffle mechanism: The energy landscape sampling and dynamic simulations journal May 2018
Disclinations and disconnections in minerals and metals journal December 2019
Microstructure and mechanical characterizations of graphene nanoplatelets-reinforced Mg–Sr–Ca alloy as a novel composite in structural and biomedical applications journal August 2019

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