Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 613, Issue -, Pages 365-371Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.06.062
Keywords
Transmission electron microscopy (TEM); Twinning; Magnesium; Hexagonal close-packed (hcp)
Categories
Funding
- Department of Energy, Basic Energy Science Project [FWP06SCPE401. LA-UR-13-29599]
Ask authors/readers for more resources
The mechanical properties of hexagonal close-packed (hcp) metals depend heavily on both slip and twinning, and interactions between twins have important implications on hardening behavior. Electron backscatter diffraction (EBSD), as well as conventional, in situ straining, and high resolution (HR) transmission electron microscopy (TEM) are used to study these interactions. HRTEM is used to observe the twin boundary structure. Twin boundaries that deviate from the characteristic {10 (1) over bar2} twin planes at the macroscale are revealed to be a combination of perfect {10 (1) over bar2) boundaries and characteristic facets at the nanoscale. Faceting for tensile {10 (1) over bar2} twins adopts basal-prismatic (B-P) character, where basal planes in the matrix very nearly align with prism planes in the twin, or similarly, prism planes in the matrix align with basal planes in the twin. Such features play a significant role in twin boundaries, where faceting accommodates the large changes to boundary shape observed, in situ straining is used to study twin twin interactions as they occur, and also detwinning behavior upon load reversal. During the initial interaction, considerable changes to the shape of the twin boundaries are observed, consistent with post-mortem analyses. On load reversal, detwinning is observed, and the interacting twins disengage from one another, however a change in boundary structure due to the interaction is retained. Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available