Abstract
We present a theoretical model that predicts the peak strength of polycrystalline metals based on the activation energy (or stress) required to cause deformation via amorphization. Building on extensive earlier work, this model is based purely on materials properties, requires no adjustable parameters, and is shown to accurately predict the strength of four exemplar metals (fcc, bcc, and hcp, and an alloy). This framework reveals new routes for design of more complex high-strength materials systems, such as compositionally complex alloys, multiphase systems, nonmetals, and composite structures.
Highlights
We present a theoretical model that predicts the peak strength of polycrystalline metals based on the activation energy required to cause deformation via amorphization
The stress required to nucleate and propagate dislocations becomes larger as the grain size decreases, and this is the basis for the Hall-Petch relationship σ 1⁄4 σ0 þ kd−1=2, where σ is the uniaxial yield stress, and σ0 and k are constants [13]
As the grain size decreases below a critical grain size dc, there is a crossover in mechanisms [14] to grain boundary sliding (GBS)
Summary
We present a theoretical model that predicts the peak strength of polycrystalline metals based on the activation energy (or stress) required to cause deformation via amorphization. Building on extensive earlier work, this model is based purely on materials properties, requires no adjustable parameters, and is shown to accurately predict the strength of four exemplar metals (fcc, bcc, and hcp, and an alloy).
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