Abstract
The aim of this work is to investigate cold worked Ti-6Al-4V (α+β) alloy. The alloy was examined by X-ray diffraction using Rietveld refinement method. MAUD software (Materials Analysis Using Diffraction) was used to analyze the microstructural parameters evolution (crystallite size, root mean square strain (r.m.s) and dislocation density. The Crystallite size is smaller in the β-phase compared to the α-phase. Microstrain and dislocation density are higher in the α-phase than those found in the β-phasefor the as received material. The microstructural parameters of Ti-6Al-4V alloy exhibit typical values of cold deformation state. The results show that the deformation process reducesthe crystallite size (coherent diffraction domains) from 520 to 210 Ȧ in the α-phase. Consequently, the r.m.s increases from 5 E-4 to 32 E-4 and the dislocation density increases from 2.92 E+10 to 4.6 E+11m-2after 85 % thickness reduction.
Highlights
Ti–6Al–4V is one of the most used α+β titanium alloys, which is employed in many industries, due to its attractive mechanical properties [1-5]
The intensive utilization of this alloy requires the control of microstructural parameters during cold working
Cold rolling is generally used as the plastic deformation processing of these alloys
Summary
Ti–6Al–4V is one of the most used α+β titanium alloys, which is employed in many industries (aeronautic, aerospace, blades, discs, rings, airframes, fasteners, components, vessels, cases, hubs, forgings, biomedical implants), due to its attractive mechanical properties [1-5]. The intensive utilization of this alloy requires the control of microstructural parameters during cold working. Titanium alloyhave matured rapidly and it is moreinterestingthan other structural materials. Cold rolling is generally used as the plastic deformation processing of these alloys. Crystallite size, r.m.s strain and dislocation density are very important factors controlling the microstructure evolution during plastic deformation. Different X-ray Diffraction Line Profile Analysis (XRDLPA) techniques have been widely applied successfully for the evaluation of microstructural parameters in deformed metals and alloy systems [6-14]. The microstructural parameters evolution after cold rolling of Ti-6Al-4V was studied. Two cold plastic deformation levels, 50% and 85% (thickness reduction) were investigated. XRDLPA was carried out using JAVA-based Materials Analysis Using Diffraction (MAUD) software [17−18]
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