Crystallographic texture dependent bulk anisotropic elastic response of additively manufactured Ti6Al4V

• Published in: Scientific reports Vol. 11; no. 1; p. 633
• Main Authors: Pantawane, Mangesh V., Yang, Teng, Jin, Yuqi, Joshi, Sameehan S., Dasari, Sriswaroop, Sharma, Abhishek, Krokhin, Arkadii, Srinivasan, Srivilliputhur G., Banerjee, Rajarshi, Neogi, Arup, Dahotre, Narendra B.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 12.01.2021; Nature Publishing Group; Nature Portfolio
• Subjects: 639/301; 639/301/1023; 639/301/1023/1026; 639/301/930/328; Additive manufacturing; Anisotropy; Humanities and Social Sciences; multidisciplinary; Science; Science (multidisciplinary); Ultrasound; Velocity; Wave velocity
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-020-80710-6

Rapid thermokinetics associated with laser-based additive manufacturing produces strong bulk crystallographic texture in the printed component. The present study identifies such a bulk texture effect on elastic anisotropy in laser powder bed fused Ti6Al4V by employing an effective bulk modulus elastography technique coupled with ultrasound shear wave velocity measurement at a frequency of 20 MHz inside the material. The combined technique identified significant attenuation of shear velocity from 3322 ± 20.12 to 3240 ± 21.01 m/s at 45 ∘ and 90 ∘ orientations of shear wave plane with respect to the build plane of printed block of Ti6Al4V. Correspondingly, the reduction in shear modulus from 48.46 ± 0.82 to 46.40 ± 0.88 GPa was obtained at these orientations. Such attenuation is rationalized based on the orientations of α ′ crystallographic variants within prior columnar β grains in additively manufactured Ti6Al4V.