4.1 Article

Understanding the interaction of extension twinning and basal-plate precipitates in Mg-9Al using precession electron diffraction

Journal

MATERIALIA
Volume 15, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.mtla.2021.101044

Keywords

Twinning; Precipitate; Precession electron diffraction; Micropillar; Mg-9Al

Funding

  1. Los Alamos National Laboratory Fellowship Program at Texas AM University
  2. Los Alamos National Laboratory Fellowship Program at Texas A&M Experimental Station
  3. U.S. Department of Energy, Office of Basic Energy Sciences (OBES) [FWP-06SCPE401]
  4. Department of Defense (DOD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
  5. National Science Foundation Designing Materials to Revolutionize and Engineer our Future (DMREF) program [NSF CMMI-1729887]
  6. National Science Foundation [DMR-1609533]
  7. Army Research Laboratory [W911NF-12-2-0022]

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Precession electron diffraction was used to characterize the interaction between {10 (1) over bar2} tensile twins and basal plate-like precipitates in a post-deformed, precipitate-dispersed Mg-9Al micropillar. The heterogeneous distribution of precipitates in the micropillar sample enabled the study of different stages involved in twin-precipitate interactions. It was found that twin nucleation was promoted by the precipitates, hindering twin tip propagation and growth.
Precession electron diffraction is used to characterize the interaction between {10 (1) over bar2} tensile twins and basal plate-like precipitates in a post-deformed, precipitate-dispersed Mg-9Al micropillar. We observed a heterogeneous distribution of precipitates in the micropillar sample, which enabled the study of the different stages involved in twin-precipitate interactions. We show that twin nucleation was promoted, taking place on the surface, as well as from the interior of the micropillar. Twin tip propagation and twin growth were hindered by the precipitates. Twin tips either were arrested by precipitates and new twins formed on the other side of the precipitate, or continued to grow around the precipitate without the re-nucleation events. During twin thickening, the precipitates did not significantly alter the shear-dominant twin boundary migration mechanism, as evidenced by the relatively flat twin boundaries around the partially embedded precipitates. However, the twin boundary migration was retarded by the precipitates, especially in regions confined by closely-spaced precipitates.

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