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Keywords = supra-nano-dual-phase

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39 pages, 6004 KiB  
Review
Nanostructured Metals with an Excellent Synergy of Strength and Ductility: A Review
by Pengpeng Pu and Tijun Chen
Materials 2022, 15(19), 6617; https://doi.org/10.3390/ma15196617 - 23 Sep 2022
Cited by 3 | Viewed by 2689
Abstract
Nanocrystalline metals developed based on fine grain strengthening always have an excellent strength, but are accompanied by a drop in ductility. In the past 20 years, substantial efforts have been dedicated to design new microstructures and develop the corresponding processing technologies in order [...] Read more.
Nanocrystalline metals developed based on fine grain strengthening always have an excellent strength, but are accompanied by a drop in ductility. In the past 20 years, substantial efforts have been dedicated to design new microstructures and develop the corresponding processing technologies in order to solve this problem. In this article, the novel nanostructures designed for simultaneously achieving high strength and high ductility developed in recent years, including bimodal grain size distribution nanostructure, nanotwinned structure, hierarchical nanotwinned structure, gradient nanostructure, and supra-nano-dual-phase nanostructure, are reviewed. Based on a comprehensive understanding of the simultaneously strengthening and toughening mechanisms, the microstructures and corresponding processing techniques are mainly discussed, and the related prospects that may be emphasized in the future are proposed. Full article
(This article belongs to the Section Metals and Alloys)
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10 pages, 10367 KiB  
Article
Preparation and Characterization of TiB2-(Supra-Nano-Dual-Phase) High-Entropy Alloy Cermet by Spark Plasma Sintering
by Shulei Zhang, Yuchen Sun, Boren Ke, Yulin Li, Wei Ji, Weimin Wang and Zhengyi Fu
Metals 2018, 8(1), 58; https://doi.org/10.3390/met8010058 - 17 Jan 2018
Cited by 19 | Viewed by 5880
Abstract
This paper introduces the preparation method and characterization results of TiB2 ceramics with CoCrFeNiAl high-entropy alloy (HEA) as a sintering aid by Spark Plasma Sintering (SPS). Good wettability between HEA and TiB2 was proved by the sessile drop method, indicating promising [...] Read more.
This paper introduces the preparation method and characterization results of TiB2 ceramics with CoCrFeNiAl high-entropy alloy (HEA) as a sintering aid by Spark Plasma Sintering (SPS). Good wettability between HEA and TiB2 was proved by the sessile drop method, indicating promising prospects for this composite. The sintering results showed that the addition of HEA could dramatically promote the sinterability of TiB2. TiB2-5 wt. % HEA dense ceramics prepared at the optimal temperature of 1650 °C showed fine morphology without formation of brittle phases. The liquid phase in the ceramics was highly consistent with the so-called “supra-nano-dual-phase materials (SNDPM)”, with near-ideal strength. This study represents the first time that a ceramic-SNDPM composite has been fabricated since the invention of such structures. Full article
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