Effect of laser parameters on microstructure and phase evolution of Ti-Si-C composites prepared by selective laser melting
Effect of laser parameters on microstructure and phase evolution of Ti-Si-C composites prepared by selective laser melting
复制标题
激光参数对选区激光熔化制备Ti-Si-C复合材料微观结构和物相演化的影响
DOI：
10.1016/j.mtcomm.2020.101114
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发表时间：
2020-09-01
影响因子：
3.8
通讯作者：
Tan, Hong-Bin
中科院分区：
文献类型：
--
作者：
Chen, Gong;Liu, Rong-Zhen;Tan, Hong-Bin
本文采用选择性激光熔化（SLM）方法对Ti/SiC混合粉末进行处理，制备了一种新型的Ti-Si-C复合材料。研究了SLM制备的Ti-Si-C复合材料的显微组织、元素分布和相演变。利用SEM、EDS、TEM和XRD等分析手段对SLM过程中的微观结构和相演变进行了研究。结果表明，工艺参数对试样的显微组织和元素分布有显著影响。结果表明，较高的激光能量密度可以促进致密化过程，从而抑制富钛相的球化现象。在微观层次上，显微组织可分为致密区和多孔区，这与元素的再分配密切相关。SLM工艺得到的相由TiCx、TiSi 2、Ti 5Si 3和Ti 5Si 4组成，它们以不同的显微结构出现。结果表明，仅通过改变激光工艺参数，就可以获得不同相和组织的复合材料，为在不增加送粉装置的情况下，采用选择性激光熔化制备Ti-Si-C梯度复合材料提供了实验指导。
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.