Dynamic compaction of titanium Aluminides by Explosively Generated Shock Waves: Microstructure and Mechanical Properties |
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| Authors: | Ferreira A. Meyers M. A. Thadhani N. N. |
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| Affiliation: | 1.Military Institute of Engineering, Urea, Rio de Janeiro,Brazil;2.Department of Applied Mechanics and Engineering Sciences,University of California-San Diego,La Jolla;3.Center for Explosives Technology Research, New Mexico Institute of Mining and Technology,Socorro |
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| Abstract: | A detailed microstructural analysis and evaluation of the mechanical properties of titanium aluminides consolidated by novel shock processes[131] are presented. Successful consolidation was obtained and was evidenced by strong bonding between individual particles. Additions of Nb and Ti and Al elemental powders resulted in enhanced interparticle bonding through intense plastic deformation of Nb and shock-induced reactions between Ti and Al. Rapid cooling of interparticle molten layers yielded amorphous Ti-Al alloys; this interparticle melting and rapid cooling are a unique feature of shock processing. Embrittlement of individual particles of Ti3Al-based alloy after exposure to 550 °C and 750 °C was observed. There is evidence of phase transformation after preheating the powder, and this fact can explain the high density of cracks obtained with this alloy after high-temperature shock consolidation. Mechanical properties of the Ti3Al-based alloy were determined at room temperature and the fracture modes were studied. The microstructural observations are correlated with the mechanical properties. |
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