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Ti-7333鈦合金低溫時(shí)效過(guò)程中ω相的析出行為
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時(shí)間：2015-08-28
對(duì)近β型Ti-7333(Ti-7Mo-3Cr-3Nb-3Al)合金在350 ℃進(jìn)行不同時(shí)間的等溫時(shí)效，結(jié)合XRD及TEM分析得出該合金等溫在時(shí)效過(guò)程中的組織演變規(guī)律，并采用等溫?zé)崤蛎浄治龇椒ㄑ芯喀叵嘧儎?dòng)力學(xué)行為。
Ti-7333鈦合金低溫時(shí)效過(guò)程中ω相的析出行為Precipitation behavior of ω phase of Ti-7333 titanium alloy
during low temperature aging
對(duì)近β型Ti-7333(Ti-7Mo-3Cr-3Nb-3Al)合金在350
℃進(jìn)行不同時(shí)間的等溫時(shí)效，結(jié)合XRD及TEM分析得出該合金等溫在時(shí)效過(guò)程中的組織演變規(guī)律，并采用等溫?zé)崤蛎浄治龇椒ㄑ芯喀叵嘧儎?dòng)力學(xué)行為。結(jié)果表明：Ti-7333合金固溶后淬火獲得單一的β組織，350
℃時(shí)效4 h彌散析出細(xì)小的顆粒狀ω相；經(jīng)時(shí)效8 h后，ω相長(zhǎng)大且均勻、彌散分布于β基體中；經(jīng)20
h時(shí)效后，β基體中除含有ω相外，還析出細(xì)小的次生α相。同時(shí)，ω相聚集成團(tuán)，造成分布不均勻，且伴隨著次生α相的析出，ω相形貌發(fā)生變化。這是由于等溫時(shí)效溫度低、淬火得到的不穩(wěn)定β相未能直接轉(zhuǎn)變成α相，而是通過(guò)先生成過(guò)渡相ω相再由ω相轉(zhuǎn)變成α相，使得合金相穩(wěn)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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