Effect Of Electronic Energy Loss On Radiation Damage Of W-Based Concentrated Solid Solution Alloys

Nuclear energy,as a low-carbon,clean,and abundant new energy source,is an important choice for future energy transformation.Due to the extremely harsh service environment of nuclear reactor materials,such as high temperature,high dose irradiation,strong oxidation corrosion,etc.,plasma oriented materials should have good high-temperature resistance,neutron irradiation resistance,corrosion resistance,and other excellent characteristics.Tungsten（W）and W-based alloys have excellent properties such as high melting point,high thermal conductivity,low coefficient of thermal expansion,and low tritium retention,and are considered to be one of the most promising plasma oriented materials in the future.Therefore,it is particularly necessary to study the radiation damage of W and W-based alloys.Due to the characteristics of metal tantalum（Ta）such as moderate hardness,high ductility,low coefficient of thermal expansion,and strong corrosion resistance,adding it to W can improve the density,tensile strength,and hardness of W.Metal rhenium（Re）has the advantages of high melting point and good mechanical properties.Its incorporation into W can improve the ductility and high-temperature strength of W,reduce the ductile-brittle transition temperature of W,and inhibit the radiation hardening of W.Therefore,this article selects W,W-Ta,and W-Re alloys as research objects,and uses a dual temperature molecular dynamics method to explore the impact of electronic energy loss effects on their radiation damage.The main research content and results of this article are as follows:（1）Using a two-temperature molecular dynamics method,the effects of irradiation energy,temperature,electron density,and activation time of electron phonon coupling on radiation damage in metal W were studied.The results showed that the number of Frenkel defect pairs in metal W increased with the increase of irradiation energy;As the temperature increases,there are significant fluctuations in the number of peak defects and surviving defects in metal W,but only from the numerical value of defects,the impact of irradiation temperature changes on the number of surviving defects in metal W is relatively weak;The effect of electron density on irradiation defects is relatively small,but when the electron density is 0.3784 e/?^-3,the number of surviving defects and peak defects in the system is relatively large,while when the electron density is 1.7660 e/?^-3,the number of surviving defects and peak defects in the system is relatively small;Under long-term cascade collision simulation,the activation time of electron phonon coupling has a significant impact on the peak value of the Frenkel defect pair of metal W,while the impact on the number of surviving defects is relatively small.The number of interstitial clusters and vacancy clusters generated by metal W cascade collisions increases with the increase of PKA energy,and the overall number of interstitial clusters is greater than that of vacancy clusters.By comparing the classical molecular dynamics simulation results,it is found that the electronic energy loss effect can effectively promote defect repair and reduce the number of defects.（2）Based on classical molecular dynamics and two-temperature molecular dynamics methods,the effects of irradiation energy,temperature,molar content,and electron density on the radiation damage of W-Ta alloys were studied.The results showed that as the irradiation energy increases,the peak value and arrival time of Frenkel defect pairs and the number and arrival time of surviving Frenkel defect pairs in W-Ta alloy also increase;The peak defects of W-Ta alloy in the two-temperature molecular dynamics model increase with the increase of irradiation temperature,while in the classical molecular dynamics model,the peak defects show a trend of first decreasing and then increasing with the increase of irradiation temperature;The radiation resistance of W-Ta alloys was better than that of metal W and when the molar ratio of W to Ta was 0.4:0.6,the radiation damage resistance of the alloys was stronger;Under the same irradiation energy and temperature,the effect of electron phonon coupling activation time on the peak defect number and surviving defect number of W-Ta alloy is small;The number of defects under the classical molecular dynamics model is significantly greater than that under other electron densities,and the irradiation defects decrease slightly with the increase of electron density,indicating that the electronic energy loss effect can reduce the number of defects and inhibit irradiation damage.（3）Based on the classical molecular dynamics and two-temperature molecular dynamics methods,the effects of irradiation energy,irradiation temperature,molar content,electron density,and electron phonon coupling activation time on radiation damage in W-Re alloys were investigated.The results showed that with the increase of irradiation energy,the peak value and arrival time of Frenkel defect pairs in W-Re alloys and the number and arrival time of surviving Frenkel defect pairs increased;The number of peak defects generated by two-temperature molecular dynamics simulation experienced a repeated process of first increasing,then decreasing,and then increasing with the increase of irradiation temperature,while the number of peak defects generated by classical molecular dynamics simulation basically gradually increased with the increase of irradiation temperature;Under electronic energy loss effect,overall,the number of surviving defects in W-Re alloy gradually increases with the decrease of Re element under low energy irradiation,while under high energy irradiation,the effect of Re element content on the number of surviving defects in W-Re alloy is relatively small;The number of defects generated by W-Re alloys simulated with different electron densities is smaller than that in the classical molecular dynamics model,and when the electron density is 1.7660 e/?^-3the number of surviving defects and peak defects generated by W-Re alloys are relatively small;The defect recombination rate of W-Re alloys is generally greater than that of metal W and W-Ta alloys,which means that the defect repair ability of W-Re alloys is stronger than that of metal W and W-Ta alloys.Figure[39]Table[4]Reference[122]...