Metamechanics metamaterials are porous metal materials composed of specific structural units arranged in a certain pattern in three-dimensional space, also known as metal lattice materials. They are a new generation of advanced lightweight and high-strength materials. On August 14th, a reporter from Science and Technology Daily learned that Professor Gu Jianfeng's team from the School of Materials Science and Engineering at Shanghai Jiao Tong University, in collaboration with Professor Ma Qian's team from the Royal Melbourne Institute of Technology in Australia, successfully printed a titanium alloy (Ti-6Al-4V) mechanical metamaterial with a density of 1.63 grams per cubic centimeter, with a yield strength of 308 MPa and a maximum compressive strength of 417 MPa, respectively. The relevant research results were recently published in "Today's Materials". The research team started from the classic Gibson Ashby model with a single deformation mechanism and established a mechanical model under the combined action of multiple deformation mechanisms (tension, bending, and shear). This model can effectively predict the strength and elastic modulus of metal mechanical metamaterials with different porosity, and is also suitable for unalloyed nano porous materials Prediction of strength and elastic modulus of metal porous materials at micro and nano scales and natural porous materials of human bones. In addition, this model can guide the implementation of regulation of various deformation mechanisms, which can be described as a comprehensive extension of the Gibson Ashby classic model from basic principles to application scope. More importantly, this model extends a new concept of designing lightweight and high-strength metal mechanical metamaterials from the perspective of deformation principles. Based on the theoretical innovation mentioned above, the research team successfully printed titanium alloy mechanical metamaterials, which have yield strength and maximum compressive strength much higher than the performance of various metal porous materials or metamaterials under the same porosity or density conditions. They are lighter, stronger, and more corrosion-resistant than commercial magnesium alloys WE54 and AZ91, and are expected to be applied in fields such as aerospace, biomedical, chemical engineering, space and energy technology. The researchers stated that the theoretical innovation of this work and experimental verification of different design schemes provide a new theoretical tool for the subsequent design and development of various lightweight and high-strength metal mechanical metamaterials. (New News Agency)