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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。
The phase transition characteristics of Ti-23Al-25Nb-0.36Y alloy were analyzed by differential thermal analysis (DTA), and the solution temperature was determined according to the characteristics of DTA curve. The microstructure and phase Composition, with Instron-5569 universal material testing machine at room temperature compression test. The results show that the DTA curve of Ti-23Al-25Nb-0.36Y alloy has two obvious endothermic reaction peaks. When the water is cooled at 1320 ℃, the microstructure of the alloy is B2 phase. When the solution temperature decreases, the alloy precipitates O phase, α2 phase. The alloy with O + B2 microstructure obtained by water cooling at 900 ℃ has the best mechanical properties. The compressive strength of the alloy reaches 1976.77 MPa, the compressibility is 36.57% and the yield strength is 789.91 MPa.