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采用拉伸试验，研究厂不同应变速率（10－5-10－1S-1）下温度对台体积分数为0．8％的TiB2、具有近全片层组织的Ti—47Al—2Mn－2Nb金属间化合物的屈服强度和延伸率的影响，得到合金韧脆转变温度随应变速率升高而升高的变化关系，确定这种含TiB2的TiAL合金的韧脆转变激活能为256kJ／mol这一数值低于无TiB2的合金的韧脆转变激活能（324kJ／mol），接近TiAl合金中原子自扩散激活能结合断口分析和理论计算结果，表明这种含TiB2的TiAl合金韧脆转变过程可能受位错攀移机制控制.
Tensile tests were carried out to study the effect of temperature on TiB2 with a volume fraction of 0.8% at different strain rates (10-5-10-1S-1), Ti-47Al-2Mn-2Nb metal with nearly full lamellar structure The results show that the ductile-brittle transition activation energy of this TiB2-containing TiAL alloy is 256kJ / mol The activation energy of ductile-brittle transition (324kJ / mol) is lower than that of TiB2-free alloy, which is close to the atomic self-diffusion activation energy of TiAl alloy. Fracture analysis and theoretical calculation show that the TiB2 alloy Ti-Ti alloy is likely to suffer from brittle transition Wrong climbing mechanism control.