ICME Team of BIT Makes New Progress in the Field of Material Microstructure Design
Recently, Advanced Materials, a top journal in the field of international materials, published an original research results in the field of microstructure design of iron materials. This research is carried out by special researcher Huang Houbing, who is from the ICME team of professor Wang Junsheng, Advanced Research Institute of Multidisciplinary Science of BIT. The title of the paper is "Hybrid magnetic micropillar arrays for programmable actuation". Huang Houbing, special researcher of BIT, is the co-corresponding author of the paper, whose other two corresponding authors are associate professor Wang Zhengzhi (the first author) of Wuhan University and professor Chen Longqing of the Pennsylvania State University.
Figure 1: A simulating the distribution of magnetic particles in the nanometer column, B magnetic particle concentration distribution diagram, C force diagram of nanometer column under magnetic field, D and E theoretical and experimental comparison of magnetogenic microcolumn bending
To explore the mechanism of magnetic particle domain motion under multi-field coupling, special researcher Huang Houbing constructed a high-concentration drift-diffusion model to reveal the structure-performance relationship: the particle gradient distribution can reduce the concentration of mismatched stress in the surface interface region, improving the fatigue resistance by an order of magnitude compared with the homogeneous surface interface while maintaining the respective mechanical strength, and guide the preparation of ferromagnetic nanometer columns with large scale gradient distribution. By manipulating the spatial distribution of magnetic nanoparticles within the matrix of highly elastic micropillars, precise adjustment of the local stiffness of the micropillars and the magnetic driving force along the micropillar axis is achieved. Combining theoretical prediction, experimental characterization and simulation calculation, it is found that under the same magnetic field driving conditions, different distributions of particles (uniform distribution, distribution to the column root, and distribution to the column tip) can cause the deformation of the micropillar to change by more than an order of magnitude. . This work fully embodies the important position of material microstructure design in the development of advanced intelligent materials and structures, and provides universal ideas and methods for the programmed control of stimuli-responsive structures.
Link to the full paper: https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202001879
A brief introduction of special researcher Huang Houbing:
Huang Houbing, special researcher and doctoral supervisor at Advanced Research Institute of Multidisciplinary Science of BIT. He is mainly engaged in the study of the microstructural evolution of phase field simulation materials, and has published more than 80 SCI papers, including 47 papers as the first or corresponding author (including Adv. Mater., Mater. Horiz., Acta. Mater., etc.). He has also published more than 30 papers (Science, Nat. Common., PRL, etc.) with his developed phase field model in cooperation with domestic and foreign teams. The source code of developed model has been integrated into the commercial software μ-Pro to provide theoretical support for material research and development. At the mesoscopic scale, the phase field method can simulate the domain structure evolution of ferroelectric, ferromagnetic and ferroelastic materials, the dendrite growth of the material during solidification, the sintering kinetics of metal and ceramic particles, the evolution of nuclear material defects and corrosion, etc. He has undertaken five projects, including the Natural Science Foundation, Ministry of Science and Technology's Key R&D Program, the National Defense Basic Science Challenge Program, and the Beijing Youth Lift Project. He served as council executive director of the first "Phase Field and Integrated Computational Materials Engineering Conference", member of Youth Working Committee of The Chinese Ceramic Society and director of Beijing Ceramic Society.
Release Date: 27-05-2020
News Source: Advanced Research Institute of Multidisciplinary Science
Editor: News Agency of BIT
Translator: Wang Ning, News Agency of BIT