Effect of laser parameters on microstructure and phase evolution of Ti-Si-C composites prepared by selective laser melting

材料科学 微观结构 选择性激光熔化 复合数 复合材料 激光器 相(物质) 多孔性 光学 物理 有机化学 化学
作者
Gong Chen,Rongzhen Liu,Yudi Qiu,Yang Yu,Jiamin Wu,Shifeng Wen,Jie Liu,Yusheng Shi,Hui Tan
出处
期刊:Materials today communications [Elsevier BV]
卷期号:24: 101114-101114 被引量:9
标识
DOI:10.1016/j.mtcomm.2020.101114
摘要

In this paper, blended Ti/SiC powder was processed by selective laser melting (SLM) method to prepare a novel kind of Ti-Si-C composite. Microstructure, elements distribution and phase evolution of Ti-Si-C composites fabricated by SLM were studied. SEM, EDS, TEM and XRD were performed to evaluate the microstructure and phase evolution during the SLM process. The results showed that processing parameters significantly affected the microstructure and element distribution of the samples. It was found that higher laser energy density could promote the densification process and hence suppress balling phenomenon of Ti-rich phases. At the micro-level, the microstructure could be classified into the dense area and the porous area, which was closely related to the redistribution of elements. The phases obtained by the SLM process were composed by TiCx, TiSi2, Ti5Si3, and Ti5Si4, which appeared in different microstructures. The results indicated that composites with different phases and microstructure could be obtained by merely modifying laser processing parameters, which could give experimental guidance for the fabricating of gradient Ti-Si-C composites by selective laser melting without additional apparatus on powder feeding.
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