Theoretical Calculation And Experimental Verification Of The Hardness Of Binary Titanium Alloys

Titanium and its alloys have been exploited as the new structural alloys due to their advantages of high specific strength,good corrosion resistance,good bio-compatibility and excellent high-temperature performance.The hardness of binary titanium alloys was selected as the object in this paper.The hardness calculation methods of binary titanium alloys were proposed by calculating the valence electron structure of phase structure units and phase interfaces based on the empirical electron theory(EET)of solids and molecules.Hardness of binary ? titanium alloys,? titanium alloys,equilibrium ?+? titanium alloys and equilibrium metastable ? titanium alloys were calculated and verified by experiments in this paper.The main results are as follows: the hardness calculated method of binary ? titanium alloys was proposed by calculating the valence electron structure of phase structure units(?-Ti,?-Ti-M)and phase interface(?-Ti//?-Ti-M)based on EET.Moreover,the calculated method was verified in binary Ti-xAl,Ti-xV and Ti-xZr alloys.The average errors of Ti-xAl,Ti-xV and Ti-xZr alloys are 4.67%,5.27% and 3.85%,respectively;the hardness calculated method of binary ? titanium alloys was proposed by calculating the valence electron structure of phase structure units(?-Ti,?-Ti-M)and phase interfaces(?-Ti//?-Ti-M)based on EET.Moreover,the calculated method was verified in binary Ti-xFe,Ti-xV and Ti-xMo alloys.The average errors of Ti-xAl,Ti-xV and Ti-xZr alloys are 2.72%,4.16% and 2.3%,respectively;the hardness calculated method of equilibrium binary ?+? titanium alloys was proposed by calculating the valence electron structure of phase structure units(?-Ti,?-Ti-M,?-Ti-M)and phase interfaces(?-Ti//?-Ti-M,?-Ti//?-Ti-M)based on EET.Moreover,the feasibility of calculated method was verified in equilibrium Ti-3Fe,Ti-6V and Ti-6Mo alloys.The average error is about 4.69%;the hardness calculated method of equilibrium binary ?titanium alloys was proposed by calculating the valence electron structure of phase structure units(?-Ti,?-Ti-M,?-Ti,?-Ti-M)and phase interfaces(?-Ti//?-Ti-M,?-Ti//?-Ti,?-Ti//?-Ti-M)based on EET.Moreover,the calculated method was verified in equilibrium Ti-7Fe,Ti-18 V and Ti-11 Mo alloys.The average error of Ti-7Fe,Ti-18 V and Ti-11 Mo alloys is about 7.57%.