Exploration of biocompatible materials with improved mechanical properties imposes a change in the chemical composition of the (α+β) titanium alloys used in the modern implantology. The increased quantity of some toxic alloying elements could eventually cause undesirable biological effects in the human body. The high Al content could lead to reducing implant in vivo survival. Simultaneously, the low Al concentration will decrease the mechanical strength of the alloy but the alloy is expected to have lower cytotoxicity and improved plasticity. The present study aims at determining the maximum vacuum heat treatment response at various cycles of solution treatment, water quenching and precipitation of Ti5Al4V alloy. For this purpose, the critical limits for the heat treatment technological parameters were defined according to the XRD analysis and Vickers hardness test results and they were taken into account for determining the optimum heat treatment process.Keywords: (α+β) titanium alloys, vacuum heat treatment, XRD, hardness
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