采用热膨胀法和金相法研究了以5℃／min的加热速率连续加热某Ti－Al－Mo－Cr－Zr－Si系新型钛合金过程中的相变过程、组织演变规律以及α相→β相的转变速率。结果表明：该合金连续加热过程中，在280～505℃温度范围内，板条状α相逐渐长大，且含量逐渐增多，发生β→α相变；在505～610℃温度范围内，板条状α相变细、变短，发生由短程扩散控制的α→β相变，此阶段温度对α相→β相的转变速率影响不大；在610～930℃温度范围内，板条状α相含量明显减少，直至消失，发生由长程扩散控制的α→β相变，此阶段α相→β相的转变速率随着温度的升高明显加快，当温度达到900℃时，α相→β相的转变速率逐渐减缓。
The phase transformation, microstructure evolution rule and rate of α→βtransformation in a new titanium alloy during continuous heating at 5 ℃/min heat rate have been studied by thermal dilatometer and metallographic methods.The results showed that the lathy-shapedαphase grew up and increased gradually in the range of 280 ℃to 505 ℃during continuous heating, and theβ→αtransformation occurred.The lathy-shapedαphase became finer and shorter in the range of 505 ℃ to 610 ℃, and the α→βtransformation occurred which was controlled by short-range diffusion.The temperature did not influence the rate ofα→βtransformation obviously in this stage.The lathy-shapedαphase decreased significantly, until disappeared in the range of 610 ℃ to 930 ℃, and the α→βtransformation occurred which was controlled by long-range diffusion.In this stage, the rate ofα→βtransformation increased with the increasing temperature at first, when the temperature reached 900 ℃, the rate of α→βtransformation slowed down gradually.
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