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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructural evolution in laser deposited nickel-titanium-carbon in situ metal matrix composites
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Microstructural evolution in laser deposited nickel-titanium-carbon in situ metal matrix composites

机译：激光沉积镍钛碳原位金属基复合材料的微观组织演变

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摘要

Laser deposition of a mixture of elemental nickel, titanium, and carbon (graphite) powders via the laser engineered net shaping (LENS) process results in an in situ titanium carbide reinforced nickel metal matrix composites. The composites have been characterized in detail using X-ray diffraction, scanning electron microscopy (including energy dispersive spectroscopy mapping), Auger electron spectroscopy, and transmission (including high resolution) electron microscopy. Both primary and eutectic titanium carbides, observed in this composite, exhibited the FCC-TiC structure (NaCl-type). Detailed characterization of the nickel/titanium carbide interface was carried out using high resolution TEM with the orientation relationship between the phases being (1 00) TiC//(l 1 0) Ni and (00 2) TiC//(l 11) Ni. Mechanical and tribological testing determined that the composites exhibited a relatively high hardness of 370 VHN and a steady-state friction coefficient of ~0.5, both improvements in comparison to LENS deposited pure Ni.
机译：通过激光工程网成形（LENS）工艺对元素镍，钛和碳（石墨）粉末的混合物进行激光沉积，可得到原位碳化钛增强的镍金属基复合材料。使用X射线衍射，扫描电子显微镜（包括能量色散谱图），俄歇电子光谱和透射（包括高分辨率）电子显微镜对复合材料进行了详细表征。在该复合材料中观察到的初生和共晶碳化钛均显示出FCC-TiC结构（NaCl型）。镍/碳化钛界面的详细表征使用高分辨率TEM进行，相之间的取向关系为（1 00）TiC //（l 1 0）Ni和（00 2）TiC //（l 11）Ni 。机械和摩擦学测试确定，该复合材料表现出较高的硬度370 VHN和稳态摩擦系数〜0.5，与LENS沉积的纯Ni相比，均得到了改善。

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