Effects of yttrium on microstructure and properties of Ti-23Al-25Nb alloy after heat treatment

被引：0
|
作者：
Chen, YY [1 ]
Si, YF [1 ]
Kong, FT [1 ]
Chen, ZY [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2006年 / 35卷 / 04期
关键词：
Ti-23Al-25Nb alloy; Y; DTA; microstructure; property;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Characteristics of phase transformations of Ti-23Al-25Nb alloy and Ti-23Al-25Nb-0.36Y alloy were analyzed by DTA. Heat treatment conditions of these alloys were worked out according to the DTA results. The microstructures and phase analysis of these alloys were analyzed by means of SEM and XRD. The existence state of Y in the original microstructure was determined by means of TEM. Room temperature compression tests were carried out on the Instron-5569 machine. Research results show that Y in the original structure exists in the form Of Y2O3, but it does not change the phase transformation temperature of Ti-23Al-25Nb alloy. After quenching at 1320 degrees C, the grain sizes of B-2 phase in Ti-23Al-25Nb-0.36Y alloy are coarser than those in Ti-23AI-25Nb alloy. With decreasing of quenching temperature, the amount of O phase increases, and its plates are thinned and more cluttered. Adding of Y increases the strength of the alloy, which is attributed to the dispersion strengthening of second phase particles of Y2O3.
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页码：655 / 658
页数：4
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