Science· 2026Q1
Engineering ordered two-dimensional defect phases to strengthen structural alloys
- 0citations
- Q1SCImago
- 2026year
Short summary
A novel predeformation and aging treatment engineers ordered, 2D defect phases in cobalt-based superalloys, increasing room-temperature strength by over 200 MPa and reducing creep rate more than threefold.
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Key points
- Predeformation followed by aging treatment creates ordered, 2D defect phases in alloys.
- These defect phases are atomically thin and form dense networks.
- Room-temperature strength increased by >200 MPa in tested alloys.
- Minimum creep rate reduced by >3x in a superalloy.
- Strengthening is attributed to local chemical ordering and impedance of slip transmission.
AI-generated from the title and abstract; the full text is not read.
Abstract
Defects in crystals are usually considered to be consequences of deformation, but they can also be engineered as strengthening features. Planar defects can strengthen structural alloys but usually form only during deformation or service, limiting control over their density, stability, and chemistry. We show that predeformation followed by aging can convert such defects into a designed architecture of ordered defect phases. In a single-crystal cobalt-nickel–based superalloy and a polycrystalline cobalt-chromium-tungsten alloy, this treatment creates dense networks of coherent, atomically thin, ordered defect–confined phases. These increase room-temperature strength by more than 200 megapascals and reduce the superalloy’s minimum creep rate by more than threefold. Electron microscopy and simulations show that local chemical ordering amplifies strengthening and that the ordered defect phases remain shearable while impeding slip transmission.
The authors' abstract, as published at the source. Science, 2026 · DOI ↗
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Field: Mechanical Engineering
Mechanical EngineeringEngineering