研究了双重时效对Ti-10V-2Fe-3Al合金低周疲劳行为的影响.结果显示,高应变幅(△εt/2=1.5％,1.2％,1.0％)下,合金表现为循环软化 ;低应变幅(△εt/2=0.8％,0.6％)下,则表现为循环应力饱和.疲劳寿命测试结果表明,双重时效疲劳寿命和直接时效疲劳寿命相当,疲劳总应变幅和疲劳寿命满足Coffin-Manson方程.SEM断口形貌显示,双重时效后疲劳裂纹稳定扩展区有明显的疲劳条纹,疲劳裂纹以穿晶方式扩展,并伴随着撕裂棱和二次裂纹,但二次裂纹较直接时效大量减少.TEM形貌显示,不论是双重时效还是直接时效,疲劳后变形组织都很均匀.虽然双重时效和直接时效具有相当的疲劳寿命,但是这种工艺缩短了时效时间,节约了能源,能更好地满足实际工业生产需求.
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