Proceedings of the National Academy of Sciences· 2015Q1
Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility
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- Q1SCImago
- 2015year
Short summary
A novel heterogeneous lamella structure in Ti, created via asymmetric rolling and partial recrystallization, achieves both ultrafine-grained strength and coarse-grained ductility, along with higher strain hardening than previously thought possible.
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Key points
- A heterogeneous lamella structure in Ti combines ultrafine-grained strength with coarse-grained ductility.
- The structure consists of soft micrograined lamellae embedded in a hard ultrafine-grained matrix.
- High strength is attributed to back stress from heterogeneous yielding, while ductility arises from back-stress and dislocation hardening.
- The production method (asymmetric rolling and partial recrystallization) is low-cost and suitable for large-scale industrial use.
AI-generated from the title and abstract; the full text is not read.
Abstract
Grain refinement can make conventional metals several times stronger, but this comes at dramatic loss of ductility. Here we report a heterogeneous lamella structure in Ti produced by asymmetric rolling and partial recrystallization that can produce an unprecedented property combination: as strong as ultrafine-grained metal and at the same time as ductile as conventional coarse-grained metal. It also has higher strain hardening than coarse-grained Ti, which was hitherto believed impossible. The heterogeneous lamella structure is characterized with soft micrograined lamellae embedded in hard ultrafine-grained lamella matrix. The unusual high strength is obtained with the assistance of high back stress developed from heterogeneous yielding, whereas the high ductility is attributed to back-stress hardening and dislocation hardening. The process discovered here is amenable to large-scale industrial production at low cost, and might be applicable to other metal systems.
The authors' abstract, as published at the source. Proceedings of the National Academy of Sciences, 2015 · DOI ↗
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Field: Mechanical Engineering
Mechanical EngineeringEngineering