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研究了应变速率和温度对 Ti45 Al10 Nb合金的屈服强度和延伸率的影响。结果表明 :随着应变速率升高 ,合金的屈服强度升高而延伸率下降 ,由此得到韧脆转变温度 TBDT随应变速率升高而升高的关系 ,并计算出 Ti45 Al10 Nb合金韧脆转变的激活能为 330 k J/ mol。这一数值与 γ- Ti Al合金中原子的自扩散激活能 (2 90 k J/ mol)相当 ,说明Ti45 Al10 Nb合金韧脆转变过程受扩散控制的形变机制 ,即位错攀移控制 ,TEM形貌和断口分析也证明这一结论。
The effects of strain rate and temperature on the yield strength and elongation of Ti45Al10Nb alloy were investigated. The results show that as the strain rate increases, the yield strength of the alloy increases and the elongation decreases. The relationship between the ductile-brittle transition temperature TBDT and the strain rate increases and the ductile-brittle transition of Ti45 Al10 Nb alloy is calculated The activation energy is 330 kJ / mol. This value is equivalent to the self-diffusion activation energy of γ-Ti Al alloy (2 90 k J / mol), which indicates that the ductile-brittle transformation process of Ti45 Al10 Nb alloy is dominated by diffusion-controlled deformation mechanisms, ie, dislocation climbing control, The appearance and fracture analysis also prove this conclusion.