Effect of hot pressing temperature on microstructure and tensile properties of TC4 titanium alloy
TC4 titanium alloys with high density,fine grain and excellent tensile properties were prepared by hot pressing(HP)sintering technique.The effects of HP sintering temperatures(880,930,980 ℃)on the micro-structure and tensile properties of TC4 titanium alloy samples were investigated by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),room temperature tensile tests,etc.The results show that the HPed TC4 samples consist mainly of equiaxed α phase and intergranular β phase.With the increase of hot pressing temperature,the grain coarsens,and the volume fraction of the α phase decreases.When HP tempera-ture is 930 ℃,the tensile properties of the alloy sample are the best at room temperature,and the maximum ten-sile strength and elongation after fracture are 934 MPa and 26.3％,respectively,which is better than the cast and hot isostatic pressing TC4 titanium alloys reported in the relevant literature.
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