Effect Of Fe On The Structural Thermal Stability And Mechanical Properties Of TiZr-based Amorphous Alloys

Amorphous alloys have received extensive attention in both theoretical and practical applications due to their unique structure and excellent mechanical properties.In this paper,Ti_32.8Zr_30.2Cu₉Ni_5.3Be_22.72.7 amorphous alloy composition is used as the matrix,and the non-consumable arc melting is combined with the copper mold suction casting technology.Effects of Fe element on the structural thermal stability and mechanical properties of Ti_32.8Zr_30.2Cu₉Ni_5.3Be_22.7 amorphous alloy in addition and substitution methods have been investig ated by X-ray Diffraction,Differential Scanning Calorimetry,Universal Testing Machine,Scanning Electron Microscope,Vivtorinox Micro Hardness Testing Machine.The atoms composition of the alloy obtained by the addition of iron element is(Ti_32.8Zr_30.2Cu₉Ni_5.3Be_22.7)_100-x00-x Fe_x（x=0,2,4,6,8）.The composition of the alloy atoms replaced by iron element is Ti_27.8Zr_30.2Cu₉Ni_5.3Be_22.7Fe₅,Ti_32.8Zr_25.2Cu₉Ni_5.3Be_22.7Fe₅,Ti_32.8Zr_30.2Cu₉Ni_5.3Be_17.7Fe₅,respectively.Through the analysis of X-ray diffraction experimental results for each component alloy,the new alloys obtained by addition of iron element are all amorphous structures,and the bars with a diameter of 10 mm are still all amorphous structures.The new alloys replaced by iron element,T5F alloys with diameters of 3 mm and 6 mm have obvious crystallization peaks,indicating the precipitation of crystal phases;alloys Z5F are amorphous amorphous and the bars with a diameter of 10 mm are still completely amorphous structure;the maximum amorphous size of alloy B5F that can be sucked and cast is（37）6 mm.The thermophysical properties of the constituent alloys were tested by differential scanning calorimetry.Experiments show that the new alloy obtained by the addition method has an increasingly stronger vitrification ability and thermal stability as the content of added Fe element increases.With the new alloy obtained by the alternative method,the alloy Z5F has the best thermal stability and vitrification ability.The mechanical properties and microhardness of each component alloy were analyzed and characterized by universal testing machine and Vickers microhardness tester.The results show that the alloy obtained by the addition method has little change in compressive fracture strength with the increase of the Fe content,but the compressive strain decreases gradually and the hardness increases gradually.The TF8 alloy with the highest hardness is 551 HV.The alloy obtained by the substitution method,the alloy Z5F has the largest compressive fracture strength and compressive strain,which are respectively 2014 MPa and 2.02%.B5F alloy has the highest hardness of 633 HV.