Journal
MATERIALIA
Volume 32, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtla.2023.101929
Keywords
Plasticity; Dislocations; Nickel alloys; Molecular dynamics (MD); Linear complexions
Categories
Ask authors/readers for more resources
This study investigates the influence of linear complexions formed by nanoparticle arrays on dislocation mechanics in a Ni-Al alloy through atomistic modeling. A new strength scaling law is discovered, and a mechanism involving both bowing and progressive unpinning is uncovered.
Linear complexions are stable defect states, where the stress field associated with a dislocation induces a local phase transformation that remains restricted to nanoscale dimensions. As these complexions are born at the defects which control plasticity in metals, it is crucial to understand their impact on subsequent mechanical properties. In this work, atomistic modeling is used to understand how dislocation mechanics are altered by the presence of nanoparticle array linear complexions in a Ni-Al alloy. Molecular dynamics simulations are used to identify the critical shear stress needed to drive dislocation breakaway, first for nanoparticle arrays formed by Monte Carlo/molecular dynamics methods to represent realistic configurations and subsequently for simplified models that allow the effects of particle spacing and size to be varied in a controlled manner. A combined bowing and progressive unpinning mechanism is uncovered, leading to the demonstration of a new strength scaling law that differs in keys ways from classical Orowan bowing.
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