Additive layer manufacturing of titanium matrix composites using the direct metal deposition laser process

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• 作者：S. Pouzet^a ; ^{sebastienpouzet@hotmail.fr" class="auth_mail" title="E-mail the corresponding author} ; P. Peyre^a ; C. Gorny^a ; O. Castelnau^a ; T. Baudin^b ; F. Brisset^b ; C. Colin^c ; P. Gadaud^d
• 关键词：DMD ; Laser ; Titanium ; Composites ; TiB
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：20 November 2016
• 年：2016
• 卷：677
• 期：Complete
• 页码：171-181
• 全文大小：9764 K

文摘

Titanium Matrix Composites (TMC's) containing various volume fractions of (TiB+TiC) particles have been deposited from powder feedstocks consisting of a blend of pre-alloyed (Ti-6Al-4V+B₄C) powders, using the direct metal deposition (DMD) laser process and the in-situ chemical reaction 5Ti+B₄C→4TiB+TiC. Process optimization has allowed to obtain a homogeneous distribution of tiny TiB whiskers within the Ti-6Al-4V α/β matrix, with a full solubilization of C for low B₄C contents (0.5 wt% and 1.5 wt%), and the formation of a small amount of globular TiC particles at higher B₄C content (3%). Comparisons with Ti-6Al-4V DMD walls revealed a substantial grain refinement on TMC's due to enhanced grain nucleation on TiB whiskers, even for low B₄C contents. Last, mechanical investigations indicated an increase of 10–15% of Vickers hardness, and a constant 10% increase of Young modulus on a large temperature range (20–600 °C) for all B₄C content.