scholarly journals Grain refining of Ti-6Al-4V alloy fabricated by laser and wire additive manufacturing assisted with ultrasonic vibration

2021 ◽  
Vol 73 ◽  
pp. 105472
Author(s):  
Ding Yuan ◽  
Shuaiqi Shao ◽  
Chunhuan Guo ◽  
Fengchun Jiang ◽  
Jiandong Wang
Keyword(s):  
Additive Manufacturing ◽  
Ultrasonic Vibration ◽  
Grain Refining

scholarly journals The Mechanism of Ultrasonic Vibration on Grain Refining and Degassing in GTA Spot Welding of Copper Joints

Materials ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 737 ◽  
Author(s):  
Salih Al-Ezzi ◽  
Gaofeng Quan ◽  
Adil Elrayah
Keyword(s):  
Ultrasonic Vibration ◽  
Spot Welding ◽  
Grain Refining

scholarly journals Development of Al-TiC Wire Feedstock for Additive Manufacturing by Metal Screw Extrusion

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1485
Author(s):  
Geir Langelandsvik ◽  
Mathieu Grandcolas ◽  
Kristian G. Skorpen ◽  
Trond Furu ◽  
Odd M. Akselsen ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Grain Morphology ◽  
Electric Arc ◽  
Grain Refining ◽  
Alloy Development ◽  
Screw Extrusion ◽  
Accumulated Strain ◽  
Alloy Addition ◽  
Tic Nanoparticles ◽  
Arc Deposition

The development of customised aluminium alloys for welding and additive manufacturing (AM) is proposed to solve several quality issues and to enhance the mechanical integrity of components. The introduction of ceramic grain refining agents shows great potential as alloy addition as to limit cracking susceptibility and increase the strength. Thus, a versatile solid-state manufacturing route for nanoparticle reinforced aluminium wires has been developed based on the metal screw extrusion principle. In fact, the Al-Si alloy AA4043 mixed with 1 wt.% TiC nanoparticles has been manufactured as a wire. The accumulated strain on the material during metal screw extrusion has been estimated, classifying the process as a severe plastic deformation (SPD) method. A chemical reaction between silicon and TiC particles after metal screw extrusion was found, possibly limiting the grain refining effect. Electric arc bead-on-plate deposition was performed with metal screw extruded and commercial material. The addition of TiC induced a grain morphology transition from columnar to equiaxed after electric arc deposition, and increased the hardness. A high amount of porosity was found in the AA4043-TiC material, probably arising from hydrogen contamination on TiC surfaces prior to metal screw extrusion. The results are encouraging as a new direction for aluminium alloy development for additive manufacturing.

scholarly journals Ultrasonic Vibration as a Primary Mixing Tool in Accelerating Aluminum–Copper Alloys Preparation from Their Pure Elements

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 781
Author(s):  
Abdulsalam Muhrat ◽  
Hélder Puga ◽  
Joaquim Barbosa
Keyword(s):  
Ultrasonic Vibration ◽  
Copper Alloys ◽  
Grain Refining ◽  
Alloying Element ◽  
Experimental Conditions ◽  
Melt Temperature ◽  
Cu Alloys ◽  
Aluminum Copper Alloys ◽  
Main Factor

In this study, ultrasonic vibration (USV) was evaluated in preparation of Al–8wt.%Cu alloys at a lab-scale. Moreover, the role of Ti–6Al–4V sonotrode erosion and its contribution in grain refining were analyzed. Based on the experimental conditions/parameters, it was found that the amount of impurities and the associated porosity were significantly reduced in USV treated alloys. Furthermore, USV reduced the time needed for dissolving the alloying element Cu, nevertheless, the best dissolving of Cu in this study was not possible without introducing further holding time. As a result of using a titanium-based sonotrode, a noticeable content of Ti was found in the ultrasonically treated alloys due to sonotrode erosion under USV. The dispersion of TiAl3 promoted, as a main factor, a grain refining effect at relatively constant and high melt temperature, other possible mechanisms of grain refining have been discussed.

scholarly journals Effect of Ultrasonic Vibration and Interpass Temperature on Microstructure and Mechanical Properties of Cu-8Al-2Ni-2Fe-2Mn Alloy Fabricated by Wire Arc Additive Manufacturing

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 215
Author(s):  
Wei Chen ◽  
Yuhua Chen ◽  
Timing Zhang ◽  
Taotao Wen ◽  
Zuozhu Yin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Additive Manufacturing ◽  
Ultrasonic Vibration ◽  
High Performance ◽  
Acoustic Streaming ◽  
Optical Microscope ◽  
Cavitation Effect ◽  
Wire Arc Additive Manufacturing ◽  
Interpass Temperature

A novel ultrasonic vibration assisted (UVA) wire arc additive manufacturing (WAAM) was used to fabricate Cu-8Al-2Ni-2Fe-2Mn alloy in this study. The effect of different interpass temperatures with and without ultrasonic vibration on the microstructural evolution and mechanical properties of the fabricated part were investigated by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), nanoindentation, and mechanical tensile testing. The results showed that reduction of the interpass temperature without UVA treatment cannot prevent the columnar dendrites directionally growing along the deposition direction. Under the UVA treatment, the coarse columnar dendrites were broken at the interpass temperature of 400 °C, and formed a fine cellular structure with an interpass temperature of 100 °C, owing to the acoustic streaming effect and cavitation effect. In addition, globular κII phase was based on Fe3Al and lamellar κIII phase was based on NiAl distributed in the interdendritic region, whereas κIV phase (rich-Fe) were precipitated in the α-Cu matrix. The improvement of microstructural characteristics caused by UVA treatment further improved the tensile properties and nano-hardness of WAAM fabricated parts. Eventually, it is experimentally demonstrated that WAAM fabricated Cu-8Al-2Ni-2Mn-2Fe alloy can obtain high-performance at UVA process under an interpass temperature of 100 °C.

Ultrasonic Vibration-Assisted Extrusion of Metal Powder Suspension for Additive Manufacturing

2018 ◽  
Vol 12 (5) ◽  
pp. 775-783 ◽  
Author(s):  
Toshitake Tateno ◽  
Akira Kakuta ◽  
Hayate Ogo ◽  
Takaya Kimoto ◽  
◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Ultrasonic Vibration ◽  
Three Dimensional ◽  
Steel Powder ◽  
Extrusion Process ◽  
Prototype System ◽  
Metallic Materials ◽  
Metal Parts ◽  
Vibration Effect ◽  
Direct Energy

Additive manufacturing (AM) using metal materials can be used to manufacture metal parts with complex shapes that are difficult to manufacture with subtractive processing. Recently, numerous commercial AM machines for metallic materials have been developed. The primary types of AM using metallic materials are powder bed fusion or direct energy deposition. Other types using metallic materials have not been adequately studied. In this study, the use of the material extrusion (ME) type of AM is investigated. The aim is to use metallic materials not only for fabricating metal parts but also for adding various properties to base materials, e.g., electric conductivity, thermal conductivity, weight, strength, and color of plastics. ME is appropriate for use with various materials by mixing different types of filler. However, there is a problem in that the high density of metal fillers generates unstable extrusion. Therefore, ultrasonic vibration was used for assisting extrusion. A prototype system was developed using an extrusion nozzle vibrated by an ultrasonic homogenizer. The experimental results showed that the ultrasonic vibration allows materials to be extruded smoothly. Three dimensional (3D) shapes could be built by multi-layer deposition with a thixotropic polymer containing a highly concentrated steel powder. As one application, a 3D-shaped object was fabricated as a sintered object. After the vibration effect in the extrusion process of steel powder and clay was confirmed, a 3D object built by the proposed method was sintered through a baking process.

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