Research On High Temperature Compression Processing And Microstructure Of Zr-45Ti-5Al-3V Alloy By Electric Field Assisted

Zirconium alloy is a kind of radiation resistant material of high quality material which has been tested for a long time.Because of the small expansion coefficient,small neutron absorption area and stable structure,it is an important material for the key components of spacecraft.And Zr-45Ti-5Al-3V alloy is also one of the most rapidly developed alloys in the field of structural materials for its excellent comprehensive mechanical properties.However,during the process of melting and casting,it is easy to result in the inhomogeneous microstructure and properties,which is mainly a mixture of alpha and beta phases,leading to high strength and low elongation.In this paper,the Zr-45Ti-5Al-3V alloy prepared by forging billet-extrusion process was treated by electric field assisted high temperature compression deformation and the microstructure and properties of the treated materials were studied later.Using MARC finite element software,at the 1473 K,1673K and 1873 K compression temperature,three field coupling simulation of heat,electricity and force the technology of Zr-45Ti-5Al-3V alloy electric field assisted hot compression deformation was carried out,and the distribution of temperature field of the material during the process of compression was analyzed which was compared with the experimental data later.Phase and microstructure of alloy compression cylinder sample after treatment of field assisted high temperature were observed and analyzed,and the microstructure of samples treated under 1473 K and 1673 K is a mixture of ? and ? phases.While it contained a kind of compound Zr5 Ti and another oxide ZrO besides ? phase solid solution when the heat treatment temperature reached 1873 K,becoming alloy of ?-Zr-Zr5Ti-Zr O composite materials;The tensile strength and yield strength of the material treated with 1473 K and 1673 K at high temperature compression treatment are significantly higher than that of the original sample.The tensile strength of the material treated by 1473 K high temperature compression deformation can reach 672.6MPa and the elongation is as high as 33.5%.This shows that the material after compression deformation at 1473 K has not only high tensile strength but also has good elongation,and has higher temperature tensile mechanical properties than the original material.The high temperature compressive properties of the three temperature treated materials were significantly better than those of the original materials under 773 K.Original sample fracture occurs at 773 K tensile deformation in the thickness direction obviously,fracture morphology was lamellar;1473K high temperature compression deformation treatment material in the 773 K tensile deformation of the fracture surface also exists part of the ductile fracture of the dimple morphology,and at the same time there is a certain ladder morphology;While when at 1873 K,the fracture surface seems to be typical cleavage fracture surface,and there have been a large number of river pattern ladder morphology.