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RSS FeedsEntropy, Vol. 20, Pages 878: Coherent Precipitation and Strengthening in Compositionally Complex Alloys: A Review (Entropy)

 
 

15 november 2018 20:00:17

 
Entropy, Vol. 20, Pages 878: Coherent Precipitation and Strengthening in Compositionally Complex Alloys: A Review (Entropy)
 


High-performance conventional engineering materials (including Al alloys, Mg alloys, Cu alloys, stainless steels, Ni superalloys, etc.) and newly-developed high entropy alloys are all compositionally-complex alloys (CCAs). In these CCA systems, the second-phase particles are generally precipitated in their solid-solution matrix, in which the precipitates are diverse and can result in different strengthening effects. The present work aims at generalizing the precipitation behavior and precipitation strengthening in CCAs comprehensively. First of all, the morphology evolution of second-phase particles and precipitation strengthening mechanisms are introduced. Then, the precipitation behaviors in diverse CCA systems are illustrated, especially the coherent precipitation. The relationship between the particle morphology and strengthening effectiveness is discussed. It is addressed that the challenge in the future is to design the stable coherent microstructure in different solid-solution matrices, which will be the most effective approach for the enhancement of alloy strength.


 
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