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以不同的频率对具有不同显微组织的Ti3Al基合金的疲劳裂纹扩展行为进行了研究。结果表明,显微组织及频率对材料的da/dN有强烈的影响,1080℃固溶处理组织具有最低的疲劳裂纹扩展速率,1110℃固溶处理组织具有最高的疲劳裂纹扩展速率。随着频率的降低,三种显微组织的疲劳裂纹扩展速率都有所增加。初生α2相的体积分数是影响疲劳扩展速率的重要因素。含有初生α2相的组织及不含初生α2相的组织的疲劳裂纹扩展有不同的机制。
The fatigue crack growth behavior of Ti3Al-based alloys with different microstructures was studied at different frequencies. The results show that the microstructure and frequency have a strong influence on the da / dN of the material. The solution treated at 1080 ℃ has the lowest fatigue crack growth rate, and the solution treated at 1110 ℃ has the highest fatigue crack growth rate. As the frequency decreases, the fatigue crack growth rates of all three kinds of microstructure increase. The volume fraction of primary α2 phase is an important factor affecting the rate of fatigue propagation. There are different mechanisms for the fatigue crack growth in the primary α2 phase-containing and non-primary α2 phases.