选区激光熔化2095铝锂合金的微观组织与拉伸性能OA

The selective laser melting(SLM)additive manufacturing technology to fabricate high-strength lightweight 2095 Al-Li alloy was utilized.The influence of laser energy density on its forming quality,microstructural evolution,and room-temperature tensile mechanical properties was systemati-cally investigated.The metallurgical defects(such as pores and cracks)distribution,melt pool mor-phology,and microstructure of the specimens were characterized in detail using optical microscopy(OM)and scanning electron microscopy(SEM).The phase composition was determined by using X-ray diffraction(XRD)technology.The quasi-static room-temperature tensile properties of the samples were tested using an electronic universal testing machine,and key mechanical indicators including ulti-mate tensile strength(UTS)and elongation(EL)were obtained.The research results indicate that the highest relative density(98.6％)and optimal comprehensive tensile properties were achieved in the specimen fabricated at the optimized laser energy density of 625.0 J/mm3,with a tensile strength of 233.59 MPa and an elongation of 7.42％.This energy density condition effectively suppress the forma-tion of metallurgical defects and promoted uniform densification of the microstructure.In conclusion,through systematic experimentation,the correlation mechanism between laser energy density and the microstructure and mechanical properties of SLM-fabricated 2095 Al-Li alloy was elucidated.The optimal process window for obtaining high density and excellent mechanical properties is successfully determined,and a critical process guidance for the application of this alloy in SLM technology was provided.