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11. Research Progress and Prospect of High-Entropy Alloy Materials

Author

Li Tianxin, Wang Shudao, Lu Yiping, Cao Zhiqiang, Wang Tongmin, and Li Tingju

Subjects
high-entropy alloy, new materials, non-ferrous materials, key strategic materials, structural materials, functional materials, Engineering (General). Civil engineering (General), TA1-2040
Abstract

With the rapid development of world’s technological level and the urgent demand of national economic construction for high-performance alloy materials, traditional single-component alloys gradually fail to satisfy the increasing service requirements. Owing to their unique physical, chemical, and mechanical properties, high-entropy alloys are expected to play an important role in major engineering fields such as national defense, aviation, aerospace, marine, nuclear energy, medical care, and new energy, greatly expanding the design range of metal material compositions. In this paper, based on the specific demands of advanced high-entropy alloy materials in various fields, the characteristics and connotations of high-entropy alloy materials are summarized, and the overall situation and prospects of high-entropy alloy material development are analyzed, as well as the current status of high-entropy alloy development in China and abroad. On this basis, the gaps and deficiencies in the field of high-entropy alloys in China are pointed out. First, some basic raw materials of the high-entropy alloys still rely on imports, which severely threatens the security of the industrial chain. Second, the research and development investment in industrial application of high-entropy alloys needs to be increased, and the industrial–academia–research–application system of high-entropy alloys is not yet sound. Regarding the above-mentioned issues, this study proposes the following policies and measures: strengthening the top-level design of high-entropy alloy material research and development while improving industrial policies; strengthening the connection and communication between enterprises and research institutes; improving the standardization, testing, characterization, and evaluation systems of high-entropy alloy materials; advancing the construction of talent teams; and reducing material costs and creating high value-added products, to promote the systematic, green, high-end, and intelligent development of China’s advanced high-entropy alloy material industry.

Published
2023
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45. Hydrogen-doped cubic diamond and the crystal structure of n-diamond

Author

Wen, Bin, Melnik, Roderick, Yao, Shan, and Li, Tingju

Subjects
Condensed Matter - Materials Science
Abstract

To understand the crystal structure of n-diamond, a hydrogen-doped (H-doped) diamond model has been investigated using first principles calculations. In particular, hydrogen concentration dependent elastic constants and lattice parameters for the H-doped diamond have been analyzed. Our results indicate that when the hydrogen concentration is less than 19 at.%, the H-doped diamond is mechanically stable. When the hydrogen concentration is about 4 at.%, the optimized lattice parameter, simulated XRD pattern and electronic properties for the H-doped diamond all agree well with the corresponding experimental values of n-diamond. The results imply that the n-diamond is likely to be an H-doped diamond., Comment: This paper has been published by a peer-reviewed Journal

Published
2011
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46. Effect of B4C particle size on the mechanical properties of B4C reinforced aluminum matrix layered composite

Author

Xu Guangye, Yu Yingshui, Zhang Yubo, Li Tingju, and Wang Tongmin

Subjects
b4c-reinforced al matrix layered composites, interface, mechanical properties, reinforcement particle size, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Reinforcement particle size is very important for the performance of metal ceramic composites. This work studied the influence of B4C particle size on the mechanical properties of Al matrix layered composites. These composites were fabricated using a simplified semicontinuous casting and hot-rolling process. To obtain an optimized filling structure of particles, Horsfield filling principle was applied to determine the size and mass fraction of B4C particles. Four sizes of B4C particles were used with various combinations. The results showed that with the increase of the B4C particle size and fine B4C mass fraction, the hardness of the composites decreases whereas the impact strength and ultimate tensile strength increase. The residual stress at interface should be responsible for the variation in properties. Besides, the interparticle distance also contributes to the change in impact strength and ultimate tensile strength.

Published
2019
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