Manufacturing size effect on the structural and mechanical properties of additively manufactured Ti-6Al-4V microbeams  

作　　者：Kaiyang Yin Bo Cao Juraj Todt Florian Gutmann Hasan Furkan Tunçay Antonina Roth Frank Fischer Nadira Grübel Aron Pfaff Georg C.Ganzenmüller Jozef Keckes Stefan Hiermaier Christoph Eberl 

机构地区：[1]Department of Microsystems Engineering,University of Freiburg,Freiburg,Germany [2]Cluster of Excellence livMatS@FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies,University of Freiburg,Freiburg,Germany [3]Chair of Materials Physics,Montanuniversität Leoben,Leoben,Austria [4]INATECH,University of Freiburg,Freiburg,Germany [5]Fraunhofer Ernst-Mach Institut,EMI,Freiburg,Germany [6]Fraunhofer IWM,Freiburg,Germany

出　　处：《Journal of Materials Science & Technology》2023年第18期18-30,共13页材料科学技术（英文版）

基　　金：funded by the Carl-Zeiss-Stiftung“Grund-lagenforschung mit Anwendungsbezug”;the funding by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)under Germany’s Excellence Strategy-EXC-2193/1-390951807;the Alexander von Humboldt Foundation for a Humboldt Research Fellowship.

摘　　要：The size effect of Ti-6Al-4V submillimeter structures manufactured by selective laser melting,which is critical for metallic mechanical metamaterials of unique mechanical properties,for example,nega-tive Poisson’s ratio and ultrahigh modulus,which show promise in biomedical,environmental,energy-related applications,has not been systematically investigated.Presented here are the quantification of the porosities by X-ray microtomography scans,texture analysis,and mechanical characterization of the addi-tively manufactured Ti-6Al-4V microbeams.We found linearly decreasing porosities,increasing mechan-ical properties,and increasing texture in the microbeam with increasing diameter from 250 to 500μm.The variation of microstructure in microbeams of different diameters and along the sample height,result-ing from the printing parameters and the thermal conditions,leads to the discrepancy between the be-havior observed in experiments and finite element simulation.Our results provide the structure-property-processing correlation to improve the manufacturing and prediction of the mechanical behavior of metal-lic mechanical metamaterials.

关 键 词：Selected laser melting POROSITY Texture Epitaxial growth Finite element modeling Metallic mechanical metamaterials 

分 类 号：TG142.24[一般工业技术—材料科学与工程]