共查询到11条相似文献,搜索用时 0 毫秒
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Phase‐Transformation Ductilization of Brittle High‐Entropy Alloys via Metastability Engineering 下载免费PDF全文
Hailong Huang Yuan Wu Junyang He Hui Wang Xiongjun Liu Ke An Wei Wu Zhaoping Lu 《Advanced materials (Deerfield Beach, Fla.)》2017,29(30)
High‐entropy alloys (HEAs) in which interesting physical, chemical, and structural properties are being continuously revealed have recently attracted extensive attention. Body‐centered cubic (bcc) HEAs, particularly those based on refractory elements are promising for high‐temperature application but generally fail by early cracking with limited plasticity at room temperature, which limits their malleability and widespread uses. Here, the “metastability‐engineering” strategy is exploited in brittle bcc HEAs via tailoring the stability of the constituent phases, and transformation‐induced ductility and work‐hardening capability are successfully achieved. This not only sheds new insights on the development of HEAs with excellent combination of strength and ductility, but also has great implications on overcoming the long‐standing strength–ductility tradeoff of metallic materials in general. 相似文献
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Multi‐principal elemental alloys, commonly referred to as high‐entropy alloys (HEAs), are a new class of emerging advanced materials with novel alloy design concept. Unlike the design of conventional alloys, which is based on one or at most two principal elements, the design of HEA is based on multi‐principal elements in equal or near‐equal atomic ratio. The advent of HEA has revived the alloy design perception and paved the way to produce an ample number of compositions with different combinations of promising properties for a variety of structural applications. Among the properties possessed by HEAs, sluggish diffusion and strength retention at elevated temperature have caught wide attention. The need to develop new materials for high‐temperature applications with superior high‐temperature properties over superalloys has been one of the prime concerns of the high‐temperature materials research community. The current article shows that HEAs have the potential to replace Ni‐base superalloys as the next generation high‐temperature materials. This review focuses on the phase stability, microstructural stability, and high‐temperature mechanical properties of HEAs. This article will be highly beneficial for materials engineering and science community whose interest is in the development and understanding of HEAs for high‐temperature applications. 相似文献
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Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys 下载免费PDF全文
Xiaopeng Li 《Advanced Engineering Materials》2018,20(5)
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Strong Electronic Interaction in Dual‐Cation‐Incorporated NiSe2 Nanosheets with Lattice Distortion for Highly Efficient Overall Water Splitting 下载免费PDF全文
Yiqiang Sun Kun Xu Zengxi Wei Huilin Li Tao Zhang Xinyang Li Weiping Cai Jianmin Ma Hong Jin Fan Yue Li 《Advanced materials (Deerfield Beach, Fla.)》2018,30(35)
Exploring highly efficient and low‐cost electrocatalysts for electrochemical water splitting is of importance for the conversion of intermediate energy. Herein, the synthesis of dual‐cation (Fe, Co)‐incorporated NiSe2 nanosheets (Fe, Co‐NiSe2) and systematical investigation of their electrocatalytic performance for water splitting as a function of the composition are reported. The dual‐cation incorporation can distort the lattice and induce stronger electronic interaction, leading to increased active site exposure and optimized adsorption energy of reaction intermediates compared to single‐cation‐doped or pure NiSe2. As a result, the obtained Fe0.09Co0.13‐NiSe2 porous nanosheet electrode shows an optimized catalytic activity with a low overpotential of 251 mV for oxygen evolution reaction and 92 mV for hydrogen evolution reaction (both at 10 mA cm?2 in 1 m KOH). When used as bifunctional electrodes for overall water splitting, the current density of 10 mA cm?2 is achieved at a low cell voltage of 1.52 V. This work highlights the importance of dual‐cation doping in enhancing the electrocatalyst performance of transition metal dichalcogenides. 相似文献
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Samrand Shafeie Sheng Guo Paul Erhart Qiang Hu Anders Palmqvist 《Advanced materials (Deerfield Beach, Fla.)》2019,31(2)
Designing alloys with an accurate temperature‐independent electrical response over a wide temperature range, specifically a low temperature coefficient of resistance (TCR), remains a big challenge from a material design point of view. More than a century after their discovery, Constantan (Cu–Ni) and Manganin (Cu–Mn–Ni) alloys remain the top choice for strain gauge applications and high‐quality resistors up to 473–573 K. Here, an average TCR is demonstrated that is up to ≈800 times smaller in the temperature range 5–300 K and >800 times smaller than for any of these standard materials over a wide temperature range (5 K < T < 1200 K). This is achieved for selected compositions of AlxCoCrFeNi high‐entropy alloys (HEAs), for which a strong correlation of the ultralow TCR is established with the underlying microstructure and its local composition. The exceptionally low electron–phonon coupling expected in these HEAs is crucial for developing novel devices, e.g., hot‐electron detectors, high‐Q resonant antennas, and materials in gravitational wave detectors. 相似文献
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A Lattice‐Strained Organic Single‐Crystal Nanowire Array Fabricated via Solution‐Phase Nanograting‐Assisted Pattern Transfer for Use in High‐Mobility Organic Field‐Effect Transistors 下载免费PDF全文
Kyunghun Kim Yecheol Rho Yebyeol Kim Se Hyun Kim Suk Gyu Hahm Chan Eon Park 《Advanced materials (Deerfield Beach, Fla.)》2016,28(16):3209-3215
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Nanowires: A Lattice‐Strained Organic Single‐Crystal Nanowire Array Fabricated via Solution‐Phase Nanograting‐Assisted Pattern Transfer for Use in High‐Mobility Organic Field‐Effect Transistors (Adv. Mater. 16/2016) 下载免费PDF全文
Kyunghun Kim Yecheol Rho Yebyeol Kim Se Hyun Kim Suk Gyu Hahm Chan Eon Park 《Advanced materials (Deerfield Beach, Fla.)》2016,28(16):3034-3034