Abstract: In this experiment, the α+β→β isothermal phase transition kinetics of Ti5Mo5V3Al-xCr (x=1.0,3.0,5.0,7.0 and 9.0) alloys at 550 ℃ were studied by synchronous X-ray diffraction technique. The results showed that the isothermal phase transition of Ti5Mo5V3Al-xCr alloys belonged to the transition of nucleation and growth, controlled by long range diffusion and could be described by JMA equation macroscopically. During the procedure of aging treatment at 550 ℃, the phase transformation rate of 1Cr alloy was relatively fast. With the increase of chromium content, the phase transition slowed down. The content of Cr was linearly decreasing with the content of the equilibrium phase. The influence of Cr element content on the phase transformation and equilibrium phase content was the main reason for the difference in the isothermal phase transformation behavior of the alloy system.
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2018, Vol. 32 
