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Ti-55531近β鈦合金的冷軋行為及其對后續(xù)時效組織的影響
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更新時間：2015-08-28
對全β固溶的Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-5531)合金進行冷軋變形與時效處理，采用SEM、TEM、XRD等手段研究冷軋變形相變與微觀組織特征及其對后續(xù)時效行為的影響。
Ti-55531近β鈦合金的冷軋行為及其對后續(xù)時效組織的影響Cold rolling and its effect on aged microstructure of
Ti-55531 near β titanium alloy
對全β固溶的Ti-5Al-5Mo-5V-3Cr-1Zr
(Ti-5531)合金進行冷軋變形與時效處理，采用SEM、TEM、XRD等手段研究冷軋變形相變與微觀組織特征及其對后續(xù)時效行為的影響。結(jié)果表明：冷軋過程中的滑移以及溫升效應(yīng)會促使絕熱ω回溶，合金中沒有出現(xiàn)存在于其他近β鈦合金中的應(yīng)力誘導(dǎo)α″。冷軋變形導(dǎo)致β晶粒在(200)晶面擇優(yōu)取向，并且形成高密度的位錯纏結(jié)以及滑移帶等缺陷。時效以后，α容易在缺陷處形核，冷軋合金析出的層片狀α更為細小且含量更高，同時α優(yōu)先在滑移帶等高密度位錯區(qū)長大，伴隨α的變體選擇效應(yīng)。
The β solution treated Ti-5Al-5Mo-5V-3Cr-1Zr alloy was
subjected to cold rolling and aging treatments. The cold rolling and its effect
on subsequent aging behavior were investigated based on SEM, TEM and XRD
techniques. The results show that the dissolution of athermal ω phase is
promoted by slip and the temperature rise effects of cold rolling deformation,
and the stress-induced martensitic α″ phase，which is observed in most of other
near β titanium alloys, is absent in this experiment. The preferred
(200)β orientation and the amount of regions with high-density
defects, such as dislocations and slip bands, are raised by cold rolling. For
the aged alloys, finer and larger amount of lamellar α phase precipitates in the
regions with high-density defects. These α precipitates preferentially coarsen
around slip bands accompanied by a variant selection effects.
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