Effect of Al addition on microstructure and mechanical properties of β-type TiZrCr alloy
TiZr5Crx Al(x= 1,2,3,and 4)alloys were prepared using a non-consumable electric arc melting furnace.The effect of different Al contents on phase structure,microstructure and mechanical properties of the TiZr5CrxAl alloys was studied by means of X-ray diffraction(XRD),optical microscope(OM),scanning electron microscopy(SEM),microhardness tester and universal material testing machine.The results show that the microstructure of the hot-rolled TiZr5CrxAl alloy is composed of a single β phase,and no other phases have been detected.As the Al content increases,the(110)crystal plane of β phase undergoes phase decomposition,forming β′ and β″ phases.During rolling deformation at 950℃,the dynamic recrystallization occurs in the TiZr5CrxAl alloys,the β grains are tended to be equiaxial gradually,and a large number of fine equiaxed structures appear at the β grain boundaries.When the Al content is 2 mass%,the comprehensive mechanical properties of the alloy are the best,with microhardness,yield strength,tensile strength and elongation of 309 HV0.2,934 Mpa,974 Mpa and 6.0%,respectively.With the increase of Al content,the fracture surface morphology of the alloys exhibits a transition from ductile fracture to brittle fracture.
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