MICROSTRUCTURES OF IN SITU TiN–Ti5Si3 COMPOSITES PREPARED BY SELECTIVE LASER MELTING

doi:10.3724/SP.J.1037.2009.00685

Acta Metall Sin

2010, Vol. 46

Issue (6): 761-768 DOI: 10.3724/SP.J.1037.2009.00685

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MICROSTRUCTURES OF IN SITU TiN–Ti₅Si₃ COMPOSITES PREPARED BY SELECTIVE LASER MELTING

GU Dongdong ^1;2;3; SHEN Yifu¹

1. College of Materials Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing 210016
2. Fraunhofer–Institut f¨ur Lasertechnik ILT; Aachen D–52074; Germany
3. Lehrstuhl fur Lasertechnik LLT; Rheinisch–Westfalische Technische Hochschule (RWTH) Aachen; Aachen D–52074; Germany

Cite this article:

GU Dongdong SHEN Yifu. MICROSTRUCTURES OF IN SITU TiN–Ti₅Si₃ COMPOSITES PREPARED BY SELECTIVE LASER MELTING. Acta Metall Sin, 2010, 46(6): 761-768.

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Abstract

The selective laser melting (SLM) was used to process the high–energy ball milled Si₃N₄–Ti (mole ratio of 1∶9) nanocomposite powder in which the average grain sizes of Si₃N₄ and Ti were both less than 20 nm. The TiN reinfrced Ti₅Si₃ matrix in situ composites were prepard by means of the synthesis reaction 9Ti+Si₃N₄=4TiN+Ti₅Si₃ . s the milling time increased, thaverge particle size of te milled Si₃N₄–Ti composite powder decreased and the resultant specific surface area increased. The densification level of laser processed TiN–Ti₅Si₃ composites increased accordingly to 97.2%. The morphologies of TiN reinforcing phase in the corresponding SLM processed structures experienced a successive change from a poly–angular shape to a near–spherical shape and finally to a dendritic shape.

Key words: TiN–Ti₅Si₃ composites selective laser melting microstructure

Received: 19 October 2009

Fund:

Supported by Alexander von Humboldt Foundation and Natural Science Foundation of Jiangsu Province (No.BK2009374)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00685 OR https://www.ams.org.cn/EN/Y2010/V46/I6/761

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