Fabrication of carbide-particle-reinforced titanium aluminide-matrix composites by laser-engineered net shaping

被引：50

作者：

Liu W. ^{[1
]}

DuPont J.N. ^{[1
]}

机构：

[1] Department of Materials Science and Engineering, Lehigh University, Bethlehem

来源：

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | 2004年 / 35卷 / 13期

基金：

美国国家科学基金会;

关键词：

Computer aided design models - Cracking susceptibility - High temperature structural applications - Laser engineered net shaping - Light optical microscopies - Processing parameters - Titanium aluminide alloy - X-ray energy dispersive spectroscopy;

D O I：

10.1007/s11661-004-1016-5

中图分类号：

学科分类号：

摘要：

TiAl-based titanium aluminide alloys and their composites reinforced with ceramic particles are considered to be important candidate materials for high-temperature structural applications. Laser-engineered net shaping (LENS) is a layered manufacturing process, which involves laser processing fine powders into three-dimensional components directly from a computer-aided design (CAD) model. In this work, the LENS process was employed to fabricate carbide-particle-reinforced titanium aluminide-matrix composites using TiC and gas-atomized Ti-48Al-2Cr-2Nb powders as the feedstock materials. The composites deposited by the LENS process were susceptible to solid-state cracking due to high thermal stresses. The microstructures of the laser-deposited monolithic and composite titanium aluminide materials were characterized using light optical microscopy (LOM), scanning electron microscopy (SEM), X-ray energy-dispersive spectroscopy (EDS) analysis, electron-probe microanalysis (EPMA), and X-ray diffraction (XRD) techniques. Effects of the LENS processing parameters on the cracking susceptibility and microstructure were studied. Crack-free deposits were fabricated by preheating the substrate to 450 °C to 500 °C during LENS processing. The fabricated composite deposits exhibit a hardness of more than twice the value of the Ti-6Al-4V alloy.

引用

页码：1133 / 1140

页数：7

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