Creep Behavior in Metallic Materials
Summary
Creep is the time‐dependent, permanent deformation of metals subjected to constant load at elevated temperature. It proceeds through three characteristic stages: primary creep with a decreasing strain rate as the material work‐hardens; secondary or steady‐state creep, where recovery and hardening balance to produce a constant rate; and tertiary creep culminating in accelerated deformation and eventual failure owing to microstructural degradation, cavity formation and necking. Mechanistically, creep can be controlled by lattice diffusion of atoms (diffusion creep), dislocation motion and climb (dislocation creep) or combinations thereof. Microstructural features such as grain size, precipitate distributions and subgrain structures critically influence creep resistance, while solute segregation at grain boundaries can promote cavitation. Recent advances in physically based, parameter‐free models now enable predictive lifetime assessments over a wide range of temperatures, stresses and alloy systems. These developments bear directly on the design and safe operation of high‐temperature components in power generation, aerospace engines and nuclear waste containment, where precise creep life estimation underpins energy efficiency and structural integrity worldwide.
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Creep Behavior in Metallic Materials publication trend
The graph below shows the total number of articles in creep behavior in metallic materials across all publications each year (not limited to Nature Index journals).
Technical terms
Primary creep: The initial stage of creep in which the strain rate decreases with time due to work‐hardening.
Steady‐state creep: The middle stage of creep exhibiting a constant strain rate as hardening and recovery processes balance.
Tertiary creep: The final stage of creep marked by accelerating strain rate and imminent failure from microstructural damage.
Dislocation creep: Creep mechanism controlled by dislocation glide and climb under applied stress.
Diffusion creep: Creep mechanism governed by atom diffusion through the lattice or along grain boundaries.
Harper-Dorn creep: A low‐stress, high‐temperature dislocation creep regime with stress exponent near unity.
Subgrain: A region within a grain characterised by a slight misorientation and dislocation cell structure that influences creep resistance.
References
- Primary creep at low stresses in copper. Materials Science and Engineering A (2023).
- Creep at low stresses in aluminium (Harper-Dorn) and in an austenitic stainless steel with a stress exponent of 1. Materials Today Communications (2023).
- Formation of Cells and Subgrains and Its Influence on Properties. Metals (2022).
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