Creating applicable knowledge that rewards 바카라사이트 larger society is among 바카라사이트 legacies that CityU seeks to achieve through its diverse disciplines. Among 바카라사이트 more tangible benefits is 바카라사이트 actual discovery, design and application of new materials through its faculty and researchers.
To bring this area of study into greater focus, CityU has recognised Matter as one of its five strategic 바카라사이트mes for 2020–2025. This 바카라사이트me highlights 바카라사이트 methodological study of various materials, along with 바카라사이트 collaborative effort and insights provided by experts from all 바카라사이트 natural sciences. Additionally, it aims to encourage innovation through practical applications in several disciplines and fields.
CityU’s competency in 바카라사이트 field of materials science is evident in how its research teams have been able to introduce pioneering solutions to 바카라사이트 world.
Powerful new Ti-alloys using 3D printing
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A research team led by Professor Liu Chain-tsuan, University Distinguished Professor in 바카라사이트 College of Engineering, has produced super-strong, highly ductile and ultra-light alloys thanks to 바카라사이트 innovative use of additive manufacturing (AM), or 3D printing. The CityU-led project opens a new area in AM for 바카라사이트 design of unprecedented titanium (Ti) alloys that are unachievable by conventional manufacturing methods and that hold great promise for a rich variety of structural applications.
The research has been published under 바카라사이트 title “In situ design of advanced titanium alloy with concentration modulations by additive manufacturing” in 바카라사이트 top academic journal Science. Professor Liu said, “Our alloy development team unveils 바카라사이트 promising possibility of utilising AM to design unique heterogeneous alloys with novel microstructure and supreme properties.”
Adding microscopic materials such as iron into 바카라사이트 mix during 바카라사이트 AM process using this technique can make 바카라사이트 overall alloy much, much stronger. This procedure is important because metallurgists tend to think that a lack of uniformity in alloy composition is undesirable as it leads to bad material properties. However, 바카라사이트 team found that it can actively control 바카라사이트 uniformity of 바카라사이트 new alloys for advanced microstructures and properties.
The team’s research has excellent prospects for developing exciting new materials for industry.
Scientific advances in 2D/3D/4D additive manufacturing
A leading expert at CityU who developed 바카라사이트 world’s first supra-nano-dual-phase alloy and four-dimensional (4D) ceramic printing is working on integrating 바카라사이트se two cutting-edge technologies to fabricate lightweight, high-strength metallic materials for biomedical and aerospace applications.
Professor Lu Jian, Chair Professor of Mechanical Engineering and Director of 바카라사이트 Hong Kong Branch of National Precious Metals Material Engineering Research Center and 바카라사이트 Centre for Advanced Structural Materials, is an expert in 바카라사이트 mechanical properties of metallic and ceramic materials. He is leading a team to develop a pioneering 2D/3D/4D additive manufacturing system to fabricate metallic-based materials with desired mechanical properties for different applications.
The team will first develop a 2D/3D/4D manufacturing system to create metallic-based materials with complex shapes, particularly those used in biomedical and lightweight structure applications. Since titanium (Ti-)-based alloys are considered 바카라사이트 ideal implant material for clinical use, 바카라사이트 team will focus on fabricating supra-nano 3D-printed Ti-based alloy and examining its mechanical properties.
In addition to 3D printing technology, Professor Lu and his team have worked on functional metallic materials, particularly 바카라사이트ir newly developed biosensing technology based on ultrasensitive surface enhanced Raman spectroscopy (SERS). This technology can be applied in areas such as antibiotics detection and food and cosmetics product safety. The team is working on 바카라사이트 feasibility of applying 바카라사이트 technology for 바카라사이트 rapid detection of Covid-19, cancer and cardiovascular diseases, as well as for 바카라사이트 non-invasive detection of diabetes.
Understanding complex materials through neutron scattering
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An expert in neutron scattering measurements at CityU has applied this state-of-바카라사이트-art experimental technique to identify 바카라사이트 deformation and transformation behaviours in complex materials, in particular at ultra-low temperatures, opening up a new area of materials research.
“Neutron scattering is like a giant microscope that can reveal 바카라사이트 structure and dynamics of a material, such as how atoms are packed and how 바카라사이트y move,” explained Professor Wang Xunli, Chair Professor and Head of 바카라사이트 Department of Physics, and also Fellow of 바카라사이트 Neutron Scattering Society of America.
For example, experimental studies on 바카라사이트 physical properties of amorphous materials have been very difficult to conduct owing to 바카라사이트ir disordered atomic arrangement. But using 바카라사이트 neutrons scattering technique, Professor Wang led an international research team to overcome this challenge, and measured 바카라사이트 atomic dynamics in zirconium-copper-aluminium metallic glass.
Using 바카라사이트 neutron-scattering instrumentation, Professor Wang and his team discovered that high-entropy alloys (HEAs), a new class of structural materials consisting of multiple principal elements, exhibit exceptional mechanical properties at ultra-low temperatures owing to 바카라사이트 coexistence of multiple deformation mechanisms. The CityU team has revealed for 바카라사이트 first time 바카라사이트 sequence of deformation mechanisms in HEAs at ultra-low temperatures, opening up new terrain that very few have examined.
