Effect of Ti Content on Microstructure Properties of Nb-Si-Mo-Ti Alloy
The effect of Ti content on the microstructure and properties of Nb-Si alloy was studied.Nb-16Si-10Mo-xTi(x = 0,2,4,6,8,10) alloy was prepared by means of mechanical ball milling and SPS sintering technology.The microstructure and mechanical properties of alloys with different x at room temperature and 1 200 ℃ were investigated.The results show that as the content of Ti increases,the ductile phase of Tiss gradually increases and gathers,and the constituent phases include Nbss,Nb5 Si3 and Tiss phases.At room temperature,the bending strength and fracture toughness of the alloy increase,the hardness decreases,and the compressive strength decreases first and then increases.When x = 0,the maximum compressive strength is 2 300 MPa.The highest compressive strength of Nb-Si-Mo-Ti alloy is 2 200 MPa,and the fracture mode changes from brittle fracture to composite fracture.At 1 200 ℃,the compressive strength decreases first and then increases.When x = 0,the highest compressive strength is 605 MPa.With the increase of the Ti content,the highest compressive strength of the Nb-Si-Mo-Ti alloy can reach 470 MPa,and it has good plastic toughness.After compression at 1 200 ℃,the microstructure is refined,the toughness phase is elongated perpendicular to the compression direction,and the hard and brittle phase is extruded to the interior or surface of the toughness phase.
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