Year-end Sale % OFF 
Abstract
Thermal stability in nanocrystalline alloys has been extensively explored while using both experimental and theoretical approaches. From the theoretical point of view, the vast majority of the models proposed in the literature have been implicitly limited to immiscible or dilute systems and thus lack the necessary generality to make predictions for different alloying interactions and in the case of intermetallic compounds formation. In this work, a general theoretical description for the case of binary W-based alloys is presented. It is shown that a critical value of the interaction energy in the grain boundary exists, such that the condition can be regarded as a criterion for thermodynamic stability assessment. A procedure for calculating the value of for each specific alloy is illustrated. A preliminary qualitative comparison between the model predictions and properly selected experimental findings taken from the literature and related to the W-Cr system is also provided.
Highlights
It has long been a primary goal of materials scientists and engineers to design the structure of polycrystalline materials and to control the coarsening phenomena that can occur during their processing and applications, since a wide variety of materials properties is known to depend on the grain size and size distribution
It is shown that a critical value Ω∗ of the interaction energy in the grain boundary Ω( gb) exists, such that the condition Ω( gb) < Ω∗ can be regarded as a criterion for thermodynamic stability assessment
Possible stable states need to be identified to analyze the thermodynamic stability of polycrystalline solid solutions
Summary
It has long been a primary goal of materials scientists and engineers to design the structure of polycrystalline materials and to control the coarsening phenomena that can occur during their processing and applications, since a wide variety of materials properties is known to depend on the grain size and size distribution. Fundamental to the improvement of this successful stabilization strategy is an understanding of the factors governing the migration of the interfaces that define the polycrystalline material structure [2] In this regard, it is well known that grain growth is expressed by the product of the grain-boundary mobility, M, and the driving force P [12]. If alloying can eliminate the driving force for grain growth, nanocrystalline alloys can be developed to retain their structure for a longer time at-temperature or at higher temperatures This would provide a better control over nanostructure, and possibly a wider range of processing routes and applications. The resulting theoretical tool is applied to W-based systems and a comparative analysis of various binary alloys is provided
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
