Australian physicists have printed a part with a titanium alloy, by acting on it with ultrasound. Such influence has changed the structure of the alloy and increased its strength by 12%. The results published in the journal Nature Communications.
There are many different methods of additive manufacturing (3D printing), which is based on the fusion of small amounts of metal. For example, electron beam melting is a method of melting metal powder with a laser beam. Laser melted metal placed on the surface thin layers, layer by layer, increasing the height of the future details.
One of the major drawbacks of multilayer weld anisotropy of the internal structure of the alloy printed parts (crystals of the alloy are elongated along the direction of printing). It is caused by the uneven temperature distribution of the workpiece during the printing process and leads to a deterioration of the deformation characteristics of the product.
A group of physicists headed by Carmelo Todaro (Carmelo Todaro) from RMIT University were able to solve the issue. The platform on which the printing process of the alloy Ti-6Al-4V, they were irradiated by ultrasound with a frequency of 20 kilohertz. The group has printed one plate of titanium with ultrasound and one without it. Comparing their structure, the scientists saw significant differences. The crystal plate irradiated with ultrasound, not only ceased to be extended, but has decreased in numbers and in size about four times.