Structure And Mechanical Properties Of 20Zr Alloy After Ti₃AlC₂ Addition

Titanium?Ti?and its alloys have been widely used in chemical industry,shipping,biomedicine and especially aerospace after their appearance because of their high specific strength,low density and excellent corrosion resistance.Ti-6Al-4V?TC4?alloy has excellent mechanical properties and has been successfully applied to commercial production.Zirconium?Zr?and Ti belong to the same group?IVB?,and they have similar physical and chemical properties.New Ti-Zr-Al-V series alloys has been successfully developed by replacing part of Ti in TC4 alloy with Zr.Based on 20Zr-Ti-6Al-4V alloy with 20%Zr element,it was studied for the effects of MAX phase?Ti₃AlC₂?content and heat treatment process on the microstructures and mechanical properties of 20Zr-Ti-6Al-4V alloys,respectively.The Ti-20Zr-6Al-4V-xTi₃AlC₂ alloys are smelted by using vacuum non-consumable electro-arc furnace.Apart from investigating the as-cast structure and compressive properties,the as-rolled alloys were also rolled at 950?to study the microstructures and mechanical properties of the as-rolled alloys.The results show that all the alloys were composed of?and?phase.Besides,with the increase of the content of MAX?Ti₃AlC₂?phase,Ti₃AlC₂ and TiC phases appeared in the alloys and increased accordingly.As-cast compressive properties increase with the increase of Ti₃AlC₂,and the maximum compressive strength of 2019.1MPa in the sample with the maximum addition?10 wt%?.After rolling at 950?and due to fine grain strengthening and interaction between strengthening phases and the matrix,Ti-20Zr-6Al-4V-1Ti₃AlC₂ exhibits better mechanical property??_b?1145 MPa,?_f?7.39%,428.06HV?than Ti-20Zr-6Al-4V??_b?1073.79 MPa,?_f?6.61%,416.37HV?.The highest ultimate tensile strength??_b?1204.09MPa,?_f?4.00%,447.71HV?has been achieved in Ti-20Zr-6Al-4V-2Ti₃AlC₂.The mechanical properties of Ti-20Zr-6Al-4V-2Ti₃AlC₂ alloys under different heat treatment conditions were studied.The results showed that the ultimate tensile strength of the alloy under 850?,950?and 1000?for 1 hour followed by water quenching increased to?_b?1244.47 MPa,?_b?1404.78MPa,?_b?1250.64 MPa,respectively.Based on considering the comprehensive properties of the alloy,the alloys by 850?for 1 hour followed by water quenching possesses outstanding mechanical properties??_b?1244.47MPa,?_f?7.57%?.