Effect of Cu on microstructure and mechanical properties of Ti-6Al-4V alloy
The TC4+xCu alloy was prepared by using spark plasma sintering technology with TC4 powder and Cu powder as raw materials,and the effects of Cu content on the microstructure and phase composition of the TC4 alloy were analyzed by using optical microscope,X-ray diffractometer,scanning electron microscope and transmission electron microscope.The results show that Ti-α is refined to different degrees after the addition of appropriate amount of Cu.However,when Cu is added more than 0.3％,the grain size of Ti-α gradually increas-es with the increase of Cu content.Adding Cu element can effectively improve the mechanical properties of TC4,the best mechanical properties when adding 0.3％Cu,its yield strength is 1 179.1 MPa,maximum com-pressive strength is 1 940.5 MPa,compression engineering strain is 32.45％,compared with the TC4 alloy with-out Cu,have enhance by 21.9％,17.46％,11％,respectively.And the density is increased to 99.3％,Cu is mainly used to improve the mechanical properties through solid solution strengthening,dislocation strengthening and fine grain strengthening.
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