Dislocation Creep¶
Dislocation creep is sustained crystal deformation carried by moving and interacting dislocations, whose obstacles, mobility and flow law depend on material and stress–temperature regime.
Core Idea¶
Dislocation creep is time-dependent plastic strain in a crystal carried by moving and interacting dislocations. Glide, climb, obstacles and dislocation back stresses influence the rate, but no single glide-then-climb sequence defines all materials. A fitted stress-power/thermal law describes a regime rather than the mechanism's identity.[ref-878f978c9527][ref-53d51fc78517]
Scope of Application¶
In hot Ni single-crystal superalloys, γ′ precipitates and narrow γ channels obstruct defects; a discrete-dislocation study found greater simulated creep strain with greater climb mobility. In olivine, experiments implicate internal stresses among dislocations in postseismic transient creep. Wallis et al. report roughly 1 GPa heterogeneity in high-temperature aggregates, while distinguishing earlier high-temperature single-crystal reports of only a few hundred MPa; the magnitude cannot be generalized across specimen types. An olivine model finds power-law breakdown without changing away from dislocation glide/climb.[ref-878f978c9527][ref-93335203512f][^ref-53d51fc78517]
Clarity¶
The carrier distinguishes dislocation creep from diffusion creep: both are slow deformation, but the latter does not require moving line defects as the chief strain mechanism. A stress exponent alone cannot prove which carrier is operating.
Manages Complexity¶
A macroscopic power-law and Arrhenius rate can summarize many defects for a large-scale calculation, as in a USGS-hosted crustal-flow model. It can hide changing precipitate interactions, transient back stresses or departure from its fitted regime.[^ref-ca8a074f3711]
Abstract Reasoning¶
Ask what drives defects, what resists their motion, what thermally enabled paths remain, and how accumulated motion creates strain. A continuum law's n and Q must be tied to the material and stress–temperature range; a changed exponent need not mean a wholly different microstructural mechanism.[ref-53d51fc78517][ref-ca8a074f3711]
Knowledge Transfer¶
The moving-dislocation test transfers between superalloy crystals and mantle olivine. Their obstacles and rates do not: precipitate cubes are not olivine back-stress networks. Live Dislocation Motion is a strict prerequisite; a portable time-dependent-deformation genus remains a future question.
[^ref-878f978c9527]: Hafez Haghighat et al., Ni superalloy dislocation dynamics, original full paper. [^ref-53d51fc78517]: Olivine power-law breakdown model, original article abstract. [^ref-93335203512f]: Wallis et al., Olivine postseismic dislocation interactions, original study. [^ref-ca8a074f3711]: Beeler et al., Crustal-flow model, Appendix A.
Relationships to Other Abstractions¶
Current abstraction Dislocation Creep Domain-specific
Parents (1) — more general patterns this builds on
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Dislocation Creep presupposes Dislocation Motion Prime
Dislocation creep requires defect motion under sustained stress, but is not a subtype of one motion event.
Hierarchy path (1) — routes to 1 parentless root
- Dislocation Creep → Dislocation Motion → Propagation
Neighborhood in Abstraction Space¶
Dislocation Creep sits in a moderately populated region (59th percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.
Family — Structural & Geological Failure Mechanics (23 abstractions)
Nearest neighbors
- Dislocation — 0.89
- Frank–Read Source — 0.85
- Stress field — 0.85
- Electron backscatter diffraction — 0.84
- Material Ratcheting — 0.84
Computed from structural-signature embeddings · 2026-10-08