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Ti-7333钛合金低温时效过程中ω相的析出行为
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-28
对近β型Ti-7333(Ti-7Mo-3Cr-3Nb-3Al)合金在350 ℃进行不同时间的等温时效，结合XRD及TEM分析得出该合金等温在时效过程中的组织演变规律，并采用等温热膨胀分析方法研究ω相变动力学行为。
Ti-7333钛合金低温时效过程中ω相的析出行为Precipitation behavior of ω phase of Ti-7333 titanium alloy
during low temperature aging
对近β型Ti-7333(Ti-7Mo-3Cr-3Nb-3Al)合金在350
℃进行不同时间的等温时效，结合XRD及TEM分析得出该合金等温在时效过程中的组织演变规律，并采用等温热膨胀分析方法研究ω相变动力学行为。结果表明：Ti-7333合金固溶后淬火获得单一的β组织，350
℃时效4 h弥散析出细小的颗粒状ω相；经时效8 h后，ω相长大且均匀、弥散分布于β基体中；经20
h时效后，β基体中除含有ω相外，还析出细小的次生α相。同时，ω相聚集成团，造成分布不均匀，且伴随着次生α相的析出，ω相形貌发生变化。这是由于等温时效温度低、淬火得到的不稳定β相未能直接转变成α相，而是通过先生成过渡相ω相再由ω相转变成α相，使得合金相稳定性增加。
Dilatometry method was used to study the ω phase
transformation kinetics of a near-β Ti-7333 titanium alloy Ti-7Mo-3Cr-3Nb-3Al
during 350 ℃ isothermal aging for different time. The microstructure evolution
was obtained by means of XRD and TEM observation. It is indicated that the
single β phase can be obtained during cooling of Ti-7333 alloy from the solution
treatment temperature. Aging at low temperature 350 ℃ for 4 h, fine ω particles
precipitate in the β matrix homogenously. Aging for 8 h, ω particles grow up
with a relatively slow speed and distribute in β matrix evenly and dispersively.
After aging for 20 h, the secondly α phase precipitates in the β matrix besides
ω particles. And the coarser ω particles form as groups in a quite non-uniform
fashion. The morphology of the ω phase particles changes slightly for the
formation of secondly α phase. This mainly ascribes that the unstable β phase
has no ability to transforms into α phase at low temperature. In order to
improve the phase stability, the unstable β phase firstly transforms into ω
phase and then the ω phase transforms into α phase.
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