Selective laser melting of in situ titanium-titanium boride composites: Processing, microstructure and mechanical properties
Selective laser melting of in situ titanium-titanium boride composites: Processing, microstructure and mechanical properties
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DOI：
10.1016/j.actamat.2014.05.022
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发表时间：
2014-09-01
期刊：
影响因子：
9.4
通讯作者：
Eckert, Juergen
中科院分区：
文献类型：
--
作者：
Attar, Hooyar;Boenisch, Matthias;Eckert, Juergen
本研究提出了选择性激光熔化（SLM）处理原位Ti-TiB复合材料从最佳球磨Ti-TiB 2粉末的结果。应用SLM制造参数的优化调整以获得几乎完全致密（> 99.5%）的Ti-TiB复合材料。X射线衍射和电子衍射图以及微观结构的调查表明，在SLM的化学反应，其中不规则形状的二硼化钛（TiB 2）颗粒与纯钛反应，形成针状的一硼化钛（TiB）颗粒。透射电子显微镜研究表明，由于B的存在，Ti晶粒得到了明显的细化。SLM生产的Ti-TiB复合材料的显微硬度、屈服应力和压缩强度分别增加到402 Hv、1103 MPa和1421 MPa，而SLM生产的商业纯Ti的显微硬度、屈服应力和压缩强度分别为261 Hv、560 MPa和1136 MPa。这些改善主要是由于TiB颗粒诱导的强化和硬化效应以及Ti晶粒的细化。断口形貌分析表明，断裂的复合材料样品在压缩试验后的断裂表面上覆盖着一个分裂/剪切和光滑/粗糙区的混合物。(C)2014 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
This study presents results of selective laser melting (SLM) processing of in situ Ti-TiB composites from optimally milled Ti-TiB2 powder. Optimized tuning of the SLM manufacturing parameters was applied to obtain almost fully dense (>99.5%) Ti-TiB composites. X-ray diffraction and electron diffraction patterns as well as microstructural investigations indicate a chemical reaction during SLM in which irregular-shape titanium diboride (TiB2) particles react with pure Ti to form needle-shape titanium monoboride (TiB) particles. Transmission electron microscopy investigations reveal that Ti grains are refined significantly due to the existence of B. The microhardness, yield stress and compressive strength of the SLM-produced Ti-TiB composites increase to 402 Hv, 1103 MPa and 1421 MPa, respectively, compared to 261 Hv, 560 MPa and 1136 MPa, respectively, for the SLM-produced commercially pure Ti. These improvements are mainly due to strengthening and hardening effects induced by TiB particles and refinement of Ti grains. Fractography analyses show that a mixture of splitting/shearing and smooth/rough zones covers the fracture surfaces of failed composite samples after compression testing. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.