Refining microstructures in additively manufactured Al/Cu gradients through TiB$_2$ inclusions
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866917679647948800 |
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| author | Abere, Michael J. Choi, Hyein Van Bastian, Levi Jauregui, Luis Babuska, Tomas F. Rodriguez, Mark. A DelRio, Frank W. Whetten, Shaun R. Kustas, Andrew B. |
| author_facet | Abere, Michael J. Choi, Hyein Van Bastian, Levi Jauregui, Luis Babuska, Tomas F. Rodriguez, Mark. A DelRio, Frank W. Whetten, Shaun R. Kustas, Andrew B. |
| contents | The additive manufacture of compositionally graded Al/Cu parts by laser engineered net shaping (LENS) is demonstrated. The use of a blue light build laser enabled deposition on a Cu substrate. The thermal gradient and rapid solidification inherent to selective laser melting enabled mass transport of Cu up to 4 mm away from a Cu substrate through a pure Al deposition, providing a means of producing gradients with finer step sizes than the printed layer thicknesses. Printing graded structures with pure Al, however, was prevented by the growth of Al$_2$Cu$_3$ dendrites and acicular grains amid a matrix of Al$_2$Cu. A combination of adding TiB$_2$ grain refining powder and actively varying print layer composition suppressed the dendritic growth mode and produced an equiaxed microstructure in a compositionally graded part. Material phase was characterized for crystal structure and nanoindentation hardness to enable a discussion of phase evolution in the rapidly solidifying melt pool of a LENS print. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_19861 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Refining microstructures in additively manufactured Al/Cu gradients through TiB$_2$ inclusions Abere, Michael J. Choi, Hyein Van Bastian, Levi Jauregui, Luis Babuska, Tomas F. Rodriguez, Mark. A DelRio, Frank W. Whetten, Shaun R. Kustas, Andrew B. Applied Physics Materials Science The additive manufacture of compositionally graded Al/Cu parts by laser engineered net shaping (LENS) is demonstrated. The use of a blue light build laser enabled deposition on a Cu substrate. The thermal gradient and rapid solidification inherent to selective laser melting enabled mass transport of Cu up to 4 mm away from a Cu substrate through a pure Al deposition, providing a means of producing gradients with finer step sizes than the printed layer thicknesses. Printing graded structures with pure Al, however, was prevented by the growth of Al$_2$Cu$_3$ dendrites and acicular grains amid a matrix of Al$_2$Cu. A combination of adding TiB$_2$ grain refining powder and actively varying print layer composition suppressed the dendritic growth mode and produced an equiaxed microstructure in a compositionally graded part. Material phase was characterized for crystal structure and nanoindentation hardness to enable a discussion of phase evolution in the rapidly solidifying melt pool of a LENS print. |
| title | Refining microstructures in additively manufactured Al/Cu gradients through TiB$_2$ inclusions |
| topic | Applied Physics Materials Science |
| url | https://arxiv.org/abs/2403.19861 |