Journal
PHILOSOPHICAL MAGAZINE
Volume 101, Issue 21, Pages 2318-2330Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2021.1971317
Keywords
Face-centred-cubic (FCC); twinning; dislocation; molecular dynamics (MD); elastic anisotropy
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Funding
- Japan Society for the Promotion of Science [JP17H01238, JP17K18827, JP18H05453]
- National Natural Science Foundation of China [11875015]
- Natural Science Foundation of Hebei Province [A2019202196]
- National Key R&D Program of China [2018YFE0308101]
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This study reveals the driving force mechanism of zero-macroscopic-strain deformation twinning through molecular dynamics simulations, and identifies the elastic anisotropy ratio as one of the key factors affecting twinnability.
Zero-macroscopic-strain deformation twinning (ZMS-DT) is widely observed in many face-centred-cubic (FCC) metals and alloys. However, the driving force of ZMS-DT is a controversial issue and has not been fully clarified for a long time. Based on molecular dynamics simulations to various FCC metals, we found that ZMS-DT, i.e. sigma(3){112} incoherent twin boundary migration can be driven by simultaneously applying both normal and shear strains/stresses to the twin boundary (TB), and changing the sign of the normal or the shear strain/stress can change the direction of the incoherent TB migration. With analysing the results of atomistic strain energy calculation and anisotropic elasticity theory, we revealed the strain energy imbalance, which originates from elastic anisotropic response of materials, between the two sides of the twin boundary under normal-shear strain (or stress) coupling condition essentially drives the TB migration and twin growth. Eventually, we deduce that the elastic anisotropy ratio can be one of the key material constants which affect the twinnability of FCC metals.
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