【摘要】 采用示差热分析(DTA)法分析了Ti-23Al-25Nb-0.36Y合金的相变特征,根据DTA曲线特征制定试验固溶温度,用SEM、XRD分析水冷后合金试样的显微组织及相组成,用Instron-5569万能材料试验机做室温压缩试验。结果表明,Ti-23Al-25Nb-0.36Y合金的DTA曲线有两个明显的吸热反应峰;在1320℃保温水冷时,合金显微组织为B2相组织,随着固溶温度降低,合金析出O相、α2相。在900℃保温水冷取得显微组织为O+B2相组织的合金具有最佳的力学性能,合金的抗压强度达到1976.77 MPa、压缩率为36.57%,屈服强度为789.91 MPa。更多还原

【Abstract】 Characteristics of phase transformation of Ti-23Al-25Nb-0.36Y alloy were analyzed by DTA.Heat treatment conditions of these alloys were determined by the DTA results.The microstructures and phase composition of alloy were analyzed by means of SEM and XRD.Room temperature compression tests were tested by the Instron-5569 machine.The experimental results show that two endothermic peak appear in DTA curves of Ti-23Al-25Nb-0.36Y alloy.The microstructure of Ti-23Al-25Nb-0.36Y alloy is B2-phase solution treated at 1320 ℃,and O-phase and α2 phase separate out along with decrease of the solution temperature.The alloy with O+B2 phases gained by solution treated at 900 ℃ has the best mechanical properties with the compressive strength of 1976.77 MPa,compressibility of 36.57% and yield strength of 789.91 MPa.更多还原