Study on Aging Structure and Mechanical Properties of Low-cost β Titanium Alloy
According to the alloy design criteria with reference to Mo equivalent([Mo]eq)and β phase stability coefficient(Kβ),two low cost titanium alloys with nominal components of Ti-9Mo-4Cr-Fe-4.6Al(1#)and Ti-9Mo-4Cr-Fe-4.6Al-0.3O(2#)were designed.The microstructure and mechanical properties under as-cast and different aging conditions were studied.The microstructure of two alloys under different aging conditions were observed and analyzed by optical microscope(OM),scanning electron microscope(SEM)and X-ray diffraction(XRD).The Vickers hardness and compression properties were tested.The results show that 1#and 2#alloy have the best precipitation effect at 550℃/8 h and 520℃for 2-5 h respectively.The mechanical performance results are as follows:the maximum hardness of the two alloys after aging treatment are 608.83 HV10 and 650.35 HV10 respectively.The compressive yield strength and compressive strength of 1#alloy are 1404 MPa and 1562 MPa respectively,the compression ratio is 9%.The compressive yield strength and compressive strength of 2#alloy are 1405 MPa and 1561 MPa respectively,the compression ratio is 21%.Therefore,in order to obtain a excellent plasticity,the aging temperature of titanium alloy containing O should be selected at 520℃.
low cast β Ti alloycompression performanceaging treatmentVickers hardnessplasticity
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