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Ti-7333鈦合金低溫時效過程中ω相的析出行為
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-08-28
對近β型Ti-7333(Ti-7Mo-3Cr-3Nb-3Al)合金在350 ℃進行不同時間的等溫時效，結合XRD及TEM分析得出該合金等溫在時效過程中的組織演變規律，并采用等溫熱膨脹分析方法研究ω相變動力學行為。
Ti-7333鈦合金低溫時效過程中ω相的析出行為Precipitation behavior of ω phase of Ti-7333 titanium alloy
during low temperature aging
對近β型Ti-7333(Ti-7Mo-3Cr-3Nb-3Al)合金在350
℃進行不同時間的等溫時效，結合XRD及TEM分析得出該合金等溫在時效過程中的組織演變規律，并采用等溫熱膨脹分析方法研究ω相變動力學行為。結果表明：Ti-7333合金固溶后淬火獲得單一的β組織，350
℃時效4 h彌散析出細小的顆粒狀ω相；經時效8 h后，ω相長大且均勻、彌散分布于β基體中；經20
h時效后，β基體中除含有ω相外，還析出細小的次生α相。同時，ω相聚集成團，造成分布不均勻，且伴隨著次生α相的析出，ω相形貌發生變化。這是由于等溫時效溫度低、淬火得到的不穩定β相未能直接轉變成α相，而是通過先生成過渡相ω相再由ω相轉變成α相，使得合金相穩定性增加。
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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