Microstructure and texture evolution in aluminum and commercially pure titanium dissimilar welds fabricated using ultrasonic additive manufacturing

Sridharan, Niyanth; Wolcott, Paul J.; Dapino, Marcelo J.; Babu, S. S.

doi:10.1016/j.scriptamat.2016.02.013

Cited by 91 publications

(52 citation statements)

References 18 publications

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“…HIP has been found to be an effective post-treatment approach for eliminating the brittle fracture and improving the strength and ductility of UAM printed AL parts in the build direction [129,130]. The use of very high power UAM has been shown to improve elastic properties of the printed AL alloys [131]. Sridharan et al [128] used very high power (VHP) UAM (9 kW) instead of low power (1.5 kW) for fabrication of 6061 Al alloy and could achieve a complete metallurgical bonding across the interfaces without any discernable voids; however, poor mechanical properties were observed in the build direction.…”

Section: Sheet Lamination Processesmentioning

confidence: 99%

“…The use of very high power UAM has been shown to improve elastic properties of the printed AL alloys [131]. Sridharan et al [128] used very high power (VHP) UAM (9 kW) instead of low power (1.5 kW) for fabrication of 6061 Al alloy and could achieve a complete metallurgical bonding across the interfaces without any discernable voids; however, poor mechanical properties were observed in the build direction.…”

Section: Sheet Lamination Processesmentioning

confidence: 99%

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Beamless Metal Additive Manufacturing

2020

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The propensity to manufacture functional and geometrically sophisticated parts from a wide range of metals provides the metal additive manufacturing (AM) processes superior advantages over traditional methods. The field of metal AM is currently dominated by beam-based technologies such as selective laser sintering (SLM) or electron beam melting (EBM) which have some limitations such as high production cost, residual stress and anisotropic mechanical properties induced by melting of metal powders followed by rapid solidification. So, there exist a significant gap between industrial production requirements and the qualities offered by well-established beam-based AM technologies. Therefore, beamless metal AM techniques (known as non-beam metal AM) have gained increasing attention in recent years as they have been found to be able to fill the gap and bring new possibilities. There exist a number of beamless processes with distinctively various characteristics that are either under development or already available on the market. Since this is a very promising field and there is currently no high-quality review on this topic yet, this paper aims to review the key beamless processes and their latest developments.

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Section: Sheet Lamination Processesmentioning

confidence: 99%

Section: Sheet Lamination Processesmentioning

confidence: 99%

Beamless Metal Additive Manufacturing

2020

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“…3 As a key assessment criteria, the attenuated characteristic of ultrasonic waves is adopted in many applications, particularly in the non-destructive testing of alloy materials. [4][5][6] 7050 aluminum alloy is an important aeronautic material.…”

Section: Introductionmentioning

confidence: 99%

A modified model for simulating the effect of temperature on ultrasonic attenuation in 7050 aluminum alloy

Han

Gong

et al. 2018

AIP Advances

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Knowing propagating properties of an ultrasonic wave can enhance the non-destructive testing techniques in alloy materials field, such as the electromagnetic acoustic transducer techniques, and the piezoelectric ultrasonic transducer techniques. When temperature is taken into consideration, the ultrasonic propagating attenuation become very complex process. In this paper, a loss factor coefficient function with change in temperatures is established and the loss factor damping model with temperature term is coupled into the equations of elastic wave motion. A modified frequency domain model for calculating the ultrasonic attenuation due to temperature changes in 7050 Aluminum alloy is then developed. The model is validated experimentally using a high power pulse transmitter/receiver RPR-4000, a resistant high temperature electromagnetic acoustic transducer set-up and a 7050 Aluminum alloy sample. The simulation and the experimental results are determined to be in good agreement. The numerical model is used to calculate the ultrasonic-waves field, the ultrasonic attenuation, and the ultrasonic propagation directivity considering the temperature effect. The modeling results indicate that the ultrasonic energy attenuation is significantly affected by temperature. When the temperature increases from 20 • C up to 480 • C, the ultrasonic energy attenuates by 32.31%. It is also found that the length of near acoustic field increases with the increase in temperature. There is a common basic mode for the attenuation of ultrasonic waves, in which the attenuated mode cannot be affected by other factors. Increasing the temperature or the frequency, the ultrasonic propagation can obtain an excellent directivity. Results obtained from the present model will provide a comprehensive understanding of design parameter effects and consequently improve the design/performance in the non-destructive testing techniques.

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“…The necessity of plastic deformation for the bond formation is well recognized in UAM [5][6][7] . To facilitate deformation in materials with high hardness it is necessary to use higher amplitudes and consequently operate the machine in the high power range.…”

Section: Introductionmentioning

confidence: 99%