Exceptional nanostructure stability and its origins in the CoCrNi-based precipitation-strengthened medium-entropy alloy. Issue 4 (3rd April 2019)

• Record Type: Journal Article
• Authors: Zhao, Yilu; Yang, Tao; Han, Bin; Luan, Junhua; Chen, Da; Kai, Wu; Liu, Chain Tsuan; Kai, Ji-jung
• Is Part Of: Materials research letters. Volume 7:Issue 4(2019)
• Page Start: 152
• Page End: 158
• Publication Date: 2019-04-03
• Subjects: Medium-entropy alloy -- coherent nanoparticles -- coarsening kinetics; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2019.1568315
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: The thermal stability of second-phase nanoparticles plays a critical role in determining the applicability and durability of precipitation-hardened alloys for engineering applications at elevated temperatures. In this work, the temporal evolutions of coherent L12 nanoparticles were quantitatively evaluated in a CoCrNi-based medium-entropy alloy. Our experimental results demonstrated an extraordinarily sluggish coarsening of these nanoparticles as compared to most conventional superalloys. The underlying origins of such remarkable nanostructure stability were further analyzed based on the ripening theories, which could be ascribed to the combined effect of small interfacial energy and slow elemental diffusion. GRAPHICAL ABSTRACT: IMPACT STATEMENT: Sluggish coarsening behavior of the L12 nanoparticles in a novel medium-entropy CoCrNi-based alloy has been quantitatively evaluated and discussed through the interfacial energy and elemental diffusion for the first time.