Influence of Interfacial Bonding between Metal Droplets on Tensile Properties of 7075 Aluminum Billets by Additive Manufacturing Technique  

作　　者：Hansong Zuo Hejun Li Lehua Qi Songyi Zhong 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China [2]School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 7100721,China

出　　处：《Journal of Materials Science & Technology》2016年第5期485-488,共4页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(No.51521061);the Defense Industrial Technology Development Program(No.A1120133026);the Doctoral Fund of Ministry of Education of China(No.20126102110022);the“111”Project of China(No.B08040);the Research Fund of the State Key Laboratory of Solidification Processing(NWPU)(No.85-TZ-2013)

摘　　要：7075 aluminum billets were fabricated by micro droplet deposition manufacturing technique, and the influence of interracial bonding between metal droplets on the tensile properties was studied. Three sets of samples were manufactured under different temperature conditions, and their mechanical properties were compared. The results show that the temperature of the metal droplets and substrate significantly affect the tensile strength of the sample. Moreover, with proper temperature setting, the 7075 aluminum billets manufactured by micro metal droplet deposition could achieve very good mechanical properties with a tensile strength of 373 MPa and an elongation of 9.95%, which are very similar to those of an ex truded sample. Moreover, a metallurgical bonding diagram based on numerical calculations of interfacial temperature was established to predict the interfacial bonding state. In addition, the fracture morphologies of these specimens were observed. It is indicated that there was a significant transformation of failure mechanism with the improvement of metallurgical bonding, which agreed well with the numerical results.7075 aluminum billets were fabricated by micro droplet deposition manufacturing technique, and the influence of interracial bonding between metal droplets on the tensile properties was studied. Three sets of samples were manufactured under different temperature conditions, and their mechanical properties were compared. The results show that the temperature of the metal droplets and substrate significantly affect the tensile strength of the sample. Moreover, with proper temperature setting, the 7075 aluminum billets manufactured by micro metal droplet deposition could achieve very good mechanical properties with a tensile strength of 373 MPa and an elongation of 9.95%, which are very similar to those of an ex truded sample. Moreover, a metallurgical bonding diagram based on numerical calculations of interfacial temperature was established to predict the interfacial bonding state. In addition, the fracture morphologies of these specimens were observed. It is indicated that there was a significant transformation of failure mechanism with the improvement of metallurgical bonding, which agreed well with the numerical results.

关 键 词：Aluminum alloys Mechanical properties Fracture behavior Interfacial bonding Additive manufacturing 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TF124.39[金属学及工艺—金属材料]