Effect Of Hot Compression Deformation On Microstructure And Properties Of ZrTiALV Alloy

ZrTiAlV alloy is a new alloy with the advantages of both titanium alloy and zirconium alloy.It has good dimensional stability,high strength,good plasticity,toughness,corrosion resistance and high temperature resistance.Therefore,ZrTiAlV alloy can be used as component material and acid resistant material for nuclear industry.In this paper,the mechanical behavior of 18.44Zr-71.73Ti-5.31Al-4.5V alloy during hot deformation was studied by Gleeble-3800 thermal simulated machine.The effects of thermal deformation parameters on the grain size,phase transition,hardness and corrosion resistance of the alloy were studied by means of X-ray diffractometer,metallographic microscope,scanning electron microscope and Vickers hardness meter.The results show that under the conditions of lower deformation temperature and higher strain rate deformation,the stress of the alloy increases rapidly with the increase of true strain to the peak value of stress,then decreases rapidly until the steady state is reached.At higher deformation temperature and lower strain rate,the stress of zirconium alloy increases rapidly with the increase of strain at first.After reaching the peak value,the stress value changes slowly until it reaches a stable state.The stress-strain curves present a typical dynamic recrystallization characteristic.The hardness of ZrTiAlV alloy is affected by the accumulation of dislocations,the composition of the phase and the morphology of the phase.When the strain rate is constant,the higher the deformation temperature,the lower the Vickers hardness of the alloy.When the deformation temperature is 900?and 950?,the hardness of the alloy increases at first and then decreases with the increase of strain rate.The hardness of the alloy increases with the increase of the strain rate at the deformation temperature of1000?and 1050?.When the deformation temperature is 950?,the corrosion resistance of the alloy is the best when the strain rate is different with the deformation temperature of10^-2s^-1.In that case where the deformation temperature is 950.degree.C.with respect to the other deformation temperature,a large number of strip-like dendritic phases are precipitated in the dendritic phase,and the corrosion resistance of the conductive phase is better than the corrosion resistance of the conductive phase.Under the condition of constant strain rate and deformation temperature,with the increase of holding time,the more uniform the grain size distribution of the alloy is,the more the?-phase content of the alloy is,after the double-pass compression deformation,the strain rate and the deformation temperature remain constant,and the grain size distribution of the alloy increases with the increase of holding time.The better the corrosion resistance of the alloy.Under the condition of constant deformation temperature and strain rate,the grain size of the alloy after double-pass compression is more uniform than that of the alloy after single-pass compression,the relative content of?-phase is higher,and the corrosion resistance of the alloy is better than that of the alloy after single-pass compression.