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Ti_3X相是影响钛合金热稳定性的重要因素。Ti_3X相沉淀和生长的倾向可用电子浓度值来描述。同时,合金脆化过程与暴露温度和时间因素有关。因此,可综合电子浓度,使用温度和时间因素加以考虑,确定一个允许的电子浓度值_p作为一个合金的热稳定性判据。热稳定性判别式可表示为∑N_if_i~a≤_p。判据具有明确的物理意义,它可以用作合金生产的质量控制标准和新的合金设计依据。若以合金元素对电子浓度的贡献来确定各合金元素的Al当量因子,则Rosenberg的经验Al当量公式应修改为1(％Al)+0.46(％Sn)+0.42(％Ga)+6.7(％O)≤8(wt-％)。
Ti_3X phase is an important factor affecting the thermal stability of titanium alloys. The tendency of Ti_3X to precipitate and grow can be described by the electron concentration value. Meanwhile, the process of alloy embrittlement and exposure temperature and time factors. Therefore, the electron concentration, temperature and time can be taken into account to determine the allowable electron concentration value _p as an alloy thermal stability criterion. The thermal stability criterion can be expressed as ΣN_if_i ~ a≤_p. Criterion has clear physical meaning, it can be used as a quality control standard for alloy production and new alloy design basis. Rosenberg’s empirical Al equivalent formula should be revised to 1% Al + 0.46% Sn + 0.42% Ga + 6.7% if the alloying element Al equivalent factor is determined by the contribution of alloying elements to the electron concentration. O) ≤8 (wt-%).