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Ti-55531近β钛合金的冷轧行为及其对后续时效组织的影响
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
对全β固溶的Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-5531)合金进行冷轧变形与时效处理，采用SEM、TEM、XRD等手段研究冷轧变形相变与微观组织特征及其对后续时效行为的影响。
Ti-55531近β钛合金的冷轧行为及其对后续时效组织的影响Cold rolling and its effect on aged microstructure of
Ti-55531 near β titanium alloy
对全β固溶的Ti-5Al-5Mo-5V-3Cr-1Zr
(Ti-5531)合金进行冷轧变形与时效处理，采用SEM、TEM、XRD等手段研究冷轧变形相变与微观组织特征及其对后续时效行为的影响。结果表明：冷轧过程中的滑移以及温升效应会促使绝热ω回溶，合金中没有出现存在于其他近β钛合金中的应力诱导α″。冷轧变形导致β晶粒在(200)晶面择优取向，并且形成高密度的位错缠结以及滑移带等缺陷。时效以后，α容易在缺陷处形核，冷轧合金析出的层片状α更为细小且含量更高，同时α优先在滑移带等高密度位错区长大，伴随α的变体选择效应。
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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