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Development of composite high entropy-medium entropy alloy coating

Scripta Materialia, 2023
The viability of adapting HEAs or MEAs with single-phase structures, such as either FCC or BCC phases, for industrial applications is challenging due to the trade-offs in properties between different phases. Therefore, a novel high entropy alloy-medium entropy alloy composite coating based on a hard metal concept was designed using a CALPHAD approach ...
Meghwal, Ashok, Singh, Surinder, Sridar, Soumya, Xiong, Wei, Hall, Colin, Munroe, Paul, Berndt, Christopher C., Ang, Andrew Siao Ming   +7 more
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Bifunctional nanoprecipitates strengthen and ductilize a medium-entropy alloy

Nature, 2021
Single-phase high- and medium-entropy alloys with face-centred cubic (fcc) structure can exhibit high tensile ductility1,2 and excellent toughness2,3, but their room-temperature strengths are low1-3. Dislocation obstacles such as grain boundaries4, twin boundaries5, solute atoms6 and precipitates7-9 can increase strength.
Ying Yang, Tianyi Chen, Lizhen Tan, Jonathan D. Poplawsky, Ke An, Yanli Wang, German D. Samolyuk, Ken Littrell, Andrew R. Lupini, Albina Borisevich, Easo P. George   +10 more
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Deformation twinning in Ti48.9Zr32.0Nb12.6Ta6.5 medium entropy alloy

Materials Science and Engineering: A, 2021
Abstract The {112} β deformation twinning has never been confirmed in refractory high or medium entropy alloys (HEAs or MEAs) at room temperature. Here a Ti48.9Zr32.0Nb12.6Ta6.5 MEA shows {112} β twins was designed based on the d-electron alloy design method learned from β Ti alloys.
Xianbing Zhang, Weilin Wang, Jialin Wu, Shubin Wang, Jian Sun, Jing Yang Chung, Stephen J. Pennycook   +6 more
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Martensitic Transformation of High-Entropy and Medium-Entropy Shape Memory Alloys

Materials Science Forum, 2021
As new generation of high-temperature shape memory alloys, high-entropy alloys (HEAs) have been attracted for strong solid-solution hardened alloys due to their severe lattice distortion and sluggish diffusion. TiPd is the one potential high-temperature shape memory alloys because of its high martensitic transformation temperature above 500 °C.
Hiromichi Matsuda, Masayuki Shimojo, Hideyuki Murakami, Yoko Yamabe-Mitarai   +3 more
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Kinking in a refractory TiZrHfNb0.7 medium-entropy alloy

Materials Letters, 2020
Abstract As a type of cooperative deformation like twinning, kinking can improve the deformability of materials by stress relaxation and crystal reorientation. In this work, kinking with 〈0 1 1〉 lattice rotation axis was identified in a refractory TiZrHfNb0.7 medium-entropy alloy (MEA).
Shubin Wang, Mingxu Wu, Da Shu, Baode Sun   +3 more
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Microstructural Characterization of Medium Entropy Alloy Thin Films

SSRN Electronic Journal, 2019
This study presents detailed microstructural investigations on single and bilayer thin films of two medium entropy alloys (MEAs) synthesized using magnetron sputter deposition. Single layer thin films of CoCrFeNi and AlCoCrFe show single-phase face-centered cubic (fcc) and body-centered (bcc) structure, respectively. The bilayer thin film consisting of
Chawake, N.Zalesak, J.Gammer, Ch.Franz, R.Cordill, M.Kim, J.Eckert, J.   +7 more
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High-temperature oxidation behaviour of low-entropy alloy to medium- and high-entropy alloys

Journal of Thermal Analysis and Calorimetry, 2018
The high-temperature oxidation behaviour of CoCrNi, CoCrNiMn, and CoCrNiMnFe equimolar alloys was investigated. All three alloys have a single-phase face-centred cubic structure. Thermogravimetric analyses (TGA) were conducted at temperatures ranging from 800 to 1000 °C for 24 h in dry air.
Nana Kwabena Adomako, Jeoung Han Kim, Yong Taek Hyun   +2 more
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Design of high-ductile medium entropy alloys for dental implants

Materials Science and Engineering: C, 2020
Developing new materials with high strength and ductility, low modulus and high biocompatibility is a continuing demand in the field of surgical implants. Inspired by the high-entropy design philosophy, two medium entropy alloys (MEAs), i.e. equiatomic TiZrHf and equi-weight Ti40Zr20Hf10Nb20Ta10 were designed and their mechanical properties and ...
Shubin, Wang, Dongle, Wu, Huan, She, Mingxu, Wu, Da, Shu, Anping, Dong, Hongchang, Lai, Baode, Sun   +7 more
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Medium entropy alloys for biomedical applications

High entropy alloys (HEAs) is a rapidly emerging class of metallic materials consisting of four or more elements in equimolar or quasi-equimolar compositions. These alloys often have simple crystal structures and tailorable properties attracting significant interest for different applications.
Zhang, Jiacheng, Stiehler, Martin, Syed, Adnan, Jorge Jr, Alberto Moreira, Jolly, Mark, Georgarakis, Konstantinos   +5 more
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Effect of Mechanical Alloying on Structure and Hardness of FeCoNiCu Medium-Entropy Alloy

Key Engineering Materials
A FeCoNiCu high-entropy alloy was synthesized via mechanical alloying using elemental powders. The structural evolution during milling and the effects of subsequent sintering were investigated. X-ray diffraction confirmed the formation of a single-phase FCC solid solution with nanocrystalline structure.
Mykyta Kovalenko, Serhii Teslia, Vladyslav Stezhkovyi, Tetiana Soloviova   +3 more
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