000			01999nab a2200205 4500
005			20260520000854.0
008			260224s2010 xxu
245	0	0	_aCorrosion behavior of Ti-6AI-4V with different thermomechanical treatments and microstructures
260			_a _b _cjun. 2010
270			_a02/07/2010 ; 01/07/2010
300			_a9 p. ; 065004
520			_aTranscripción del resumen del autor: The corrosion behavior of four different microstructures of Ti-6Al-4V with varying volume fractions of primary a (0, 10%~20%, 40%~50%, and ~90%) was investigated in sodium chloride (NaCl) and hydrochloric acid (HCl) solutions. The microstructure constituent morphologies and distributions were characterized with optical and scanning electron microscopy (SEM) while constituent compositions were determined with energy-dispersive x-ray (EDX) analysis. All four microstructures exhibited spontaneous passivity in 0.9% NaCl at 37°C and active/passive transitions in 1.5 M HCl at 37°C. Very little difference in corrosion rate was observed using potentiodynamic polarization curves and weight-loss tests. However, SEM analysis of corroded surfaces indicated that the fully lamellar structure (0% primary a) exhibited the worst attack. Analysis of surfaces after 48 h immersion in 3.5 M HCl revealed that a/ß phase boundaries were preferential sites for corrosion attack. Also, ß phase in lamellar structures exhibited preferential dissolution in comparison to a phase. The corrosion results are discussed in terms of microstructure and constituent composition. In particular, the extent of partitioning of vanadium to the ß phase during heat treatment varies with the volume fractions of primary a and transform ß, which affects the corrosion performance in aggressive environments.
581			_a6
773	0		_tCorrosion _g66
942			_cARTICULO
100	1		_aAtapour, M. _943345
100	1		_aPilchak, A. _943346
100	1		_aFrankel, G.S. _927480
999			_c171638 _d171638