Dislocation cross-slip in precipitation hardened Mg–Nd alloys

Huang, Zhihua; Yang, Chaoming; Allison, John E.; Qi, Liang; Misra, Amit

doi:10.1016/j.jallcom.2020.157858

Dislocation cross-slip in precipitation hardened Mg–Nd alloys

Journal Article · Thu Nov 12 00:00:00 EST 2020 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2020.157858· OSTI ID:1851125

Huang, Zhihua ^[1]; ^[2]; Allison, John E. ^[2]; Qi, Liang ^[2]; Misra, Amit ^[2]

Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering; Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

An integrated experimental characterization and molecular dynamics (MD) simulation approach was used to explore the dislocation-precipitate interactions in a dilute Magnesium–Neodymium (Mg–Nd) precipitation hardened alloy. In situ indentation in a transmission electron microscope (TEM) and postmortem TEM characterization of deformed samples and MD simulations revealed that basal < a > type dislocations interacted differently with β₁ (Mg₃Nd) and β"(Mg_3-7Nd) precipitates. For β" precipitates, the basal dislocations directly shear the precipitates. For β₁ precipitates, such shearing becomes much more difficult because it requires the creation of antiphase boundaries in the ordered lattice of β₁ precipitates. Screw dislocations were observed to cross-slip from basal to the prismatic plane, which could be parallel to the broad facet of β₁ precipitates. It is postulated that double cross-slip (basal to prismatic to basal) via the Hirsch mechanism may enable screw dislocations to overcome the β₁ precipitates. MD simulations also revealed that an edge dislocation is unable to bypass the precipitate via the generation of screw dislocation segments plus the double cross-slip mechanism. The edge dislocation can bow around the precipitate, and the segment that adopts a screw character can cross-slip to the prismatic plane but with increasing applied stress, cross-slips back to the original basal plane to continue glide via precipitate shearing. Finally, the implication of glide dislocation - β₁-precipitate interaction mechanisms on the strength and ductility of β₁ precipitate dominant microstructures is discussed.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Oakland, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; SC0008637

OSTI ID:: 1851125

Alternate ID(s):: OSTI ID: 1778277

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 859; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Dislocation cross-slip in precipitation hardened Mg–Nd alloys

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