Direct fabrication of compositionally graded Ti-Al2O3 multi-material structures using Laser Engineered Net Shaping
Direct fabrication of compositionally graded Ti-Al2O3 multi-material structures using Laser Engineered Net Shaping
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DOI：
10.1016/j.addma.2018.03.001
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发表时间：
2018-05-01
影响因子：
11
通讯作者：
Bandyopadhyay, Amit
中科院分区：
文献类型：
--
作者：
Zhang, Yanning;Bandyopadhyay, Amit
利用激光工程净成形技术(LENS(TM))制备了成分梯度结构的Ti-Al_2O_3复合材料。Ti-Al_2O_3梯度复合材料由Ti6Al4V合金、Ti6Al4V+Al_2O_3复合材料和纯Al_2O_3陶瓷组成。经Lens(TM)处理后，对Ti-Al_2O_3梯度复合材料的横截面进行了显微组织表征、物相分析、元素分布和显微硬度测量。每一段都有其独特的显微结构和物相。此外，硬度测试表明，纯Al_2O_3断面的硬度最高，为2365.5+/-64.7HV0.3。传统的陶瓷加工需要大量的后处理，包括高温烧结，这使得直接制造金属-陶瓷多层结构变得困难。结果表明，基于计算机辅助设计文件，可以在保持尺寸、形状和成分变化的同时，利用Lens(TM)一步成形多材料金属陶瓷复合材料。由于这是第一代工作，与金属和陶瓷在一次操作中的Lens(TM)加工相关的出版文献中可获得的研究结果有限，这项工作的示范有望激励使用AM制造多材料复合材料的未来研究
Laser Engineered Net Shaping (LENS (TM)), which is a laser based additive manufacturing method, was utilized to fabricate Ti-Al2O3 compositionally graded structures. The Ti-Al2O3 graded composites consisted of different sections - Ti6Al4V alloy, Ti6Al4V + Al2O3 composites, and pure Al2O3 ceramic. After LENS (TM) processing, microstructural characterization, phase analysis, elemental distribution, and microhardness measurements were performed on the cross sections of Ti-Al2O3 graded composites. Each section had their unique microstructures and phases. Moreover, hardness measurements demonstrated that the pure Al2O3 section had the highest hardness of 2365.5 +/- 64.7 HV0.3. Conventional ceramic processing requires extensive post-processing including high temperature sintering, which makes it difficult for direct fabrication of metal-ceramic multi-layer structures. The results demonstrate that LENS (TM) can be utilized to process multi-material metal ceramic composites in a single step while maintaining the size, shape and compositional variations based on computer aided design files. Since this is a first-generation work, and limited research results are available in published literature related to LENS (TM) processing of both metals and ceramics in one operation, the demonstration of this work is expected to inspire future studies on manufacturing of multi-material composites using AM.