Research Highlights
Recently, the research team of Professor Xiaogang Li and Professor Hongluo from the Advanced Innovation Center of Material Genetic Engineering in The Institute of New Materials Technology of our university and the National Data Center of Material Corrosion and Protection Science innovated the design concept of corrosion-resistant alloy, and found a single-phase CoNiV alloy with excellent processing performance, high strength and toughness, corrosion resistance and hydrogen brittle fracture resistance. The alloy's tensile strength exceeds 1Gpa at room temperature, elongation exceeds 80%, its resistance to dilute acid corrosion is similar to austenitic stainless steel, and its resistance to hydrogen embrittance is much higher than most of the existing metal materials and alloys. It has a great application prospect in nuclear power, Marine, hydrogen energy, petrochemical and other fields. International famous academic journal Nature Communications reported this important research progress online with the topic of "A strong and ductile medium-entropy alloy Resists hydrogen Embrittlement and corrosion resistance". It was also one of the few research papers to report corrosion resistance metal materials in this journal in recent years.
High strength and toughness, resistance to dilute sulfuric acid corrosion and hydrogen embrittement are of great significance to the long life and service safety of metal materials. They are not only the major frontier scientific problems in the field of corrosion resistant metal structural materials, but also the limit of engineering application. Consider workability, Gao Qiangren, corrosion resistance and resistance to hydrogen embrittlement fracture between contradictory difficulties and characteristics of the research team and Korea university in South Korea, the Max Planck institute in Germany team, after long-term research, innovation of alloy design concept, with big data, machine learning and phase diagram calculation as the beginning of design of alloy, high flux sifting the feasibility of alloy elements, design the preparation technology is simple, the processing performance is good, the Gao Qiangren single-phase solid solution alloy, high strength and corrosion resistance, resistance to the organic unity of hydrogen brittle fracture. The composite properties of the alloy depend on the single phase solid solution, low hydrogen diffusion coefficient, twin structure generated during deformation and super corrosion resistant passivation film on the surface.
FIG. 1 Microstructure and 3D-APT of single-phase solid solution after cold rolling annealing of alloy
FIG. 2 Microstructure changes of the alloy after deformation loading
FIG. 3 Corrosion behavior of alloys in sulfuric acid environment and surface passivation film composition
This research result greatly expands the design concept and application of high strength, tough and corrosion-resistant alloy, and opens up a new way and method for the development of high quality corrosion-resistant metal materials with integrated structure and function. It marks a new level of scientific research in the field of corrosion-resistant metal materials in our university. This work is also supported by funds from the Ministry of Science and Technology, the National Natural Science Foundation of China and the SEVENTH Framework Programme of the European Union.
Links: https://www.nature.com/articles/s41467-020-16791-8