期刊
ACTA MATERIALIA
卷 58, 期 5, 页码 1887-1894出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.11.032
关键词
Electron beam methods; Titanium aluminides; SEM; TEM; XRD
资金
- Mr. and Mrs. Macintosh Murchison endowments at the University of Texas at El Paso
Intermetallic, gamma-TiAl, equiaxed, strian-grain (similar to 2 mu m) structures with lamellar gamma/alpha(2)-Ti3Al colonies with average spacing of 0.6 mu m have been fabricated by additive manufacturing using electron beam melting (EBM) of precursor, atomized powder. The residual microindentation (Vickers) hardness (HV) averaged 4.1 GPa, corresponding to a nominal yield strength of similar to 1.4 GPa (similar to HV/3), and a specific yield strength of 0.37 GPa cm(3) g(-1) (for a density of 3.76 g cm(-3)), in contrast to 0.27 GPa cm(3) g(-1) for EBM-fabricated Ti-6Al-4V components. These results demonstrate the potential to fabricate near net shape and complex titanium aluminide products directly using EBM technology in important aerospace and automotive applications. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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