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	Ti6Al4V matrix composites fabricated by laser powder bed fusion in dilute nitrogen
	Zhu, Lei1,2; Zhang, Kaiwang1; Fan, Shuqian2; Wei, Wenhou2
	2022-03-04
摘要	In situ synthesised TiN reinforced Ti6Al4V matrix composites were fabricated via laser powder bed fusion (L-PBF) in an atmosphere of 10vol.-% N-2 and 90vol.-% Ar based on novel gas-liquid reaction between N-2 and Ti6Al4V melt pool. With lower laser energy density (LED), the microstructures of the composites mainly consisted of acicular alpha ' martensites, while the martensites were shortened and coarsened with increasing LED. The X-ray diffraction analysis demonstrated that the interstitial solid solution of N was formed in the Ti lattice. High-resolution transmission electron microscopy analysis confirmed the generation of TiN. The microhardness, yield strength, ultimate strength and plasticity of the composites initially increased and then decreased with increasing LED. The strengthening mechanisms of the composites were elucidated.
关键词	Ti6Al4V alloys laser powder bed fusion additive manufacturing laser energy density gas-liquid reaction 3D printing Ti6Al4V matrix composites metal matrix composites
DOI	10.1080/02670836.2022.2033542
发表期刊	MATERIALS SCIENCE AND TECHNOLOGY
ISSN	0267-0836
卷号	38期号:4页码:207-214
通讯作者	Zhang, Kaiwang(kwzhang@xtu.edu.cn) ; Wei, Wenhou(weiwenhou@cigit.ac.cn)
收录类别	SCI
WOS记录号	WOS:000754100900001
语种	英语