Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0075-06
Ti-55531近β钛合金的冷轧行为及其对后续时效组织的影响
陈福文,张晓泳,李志友,周科朝

(中南大学 粉末冶金国家重点实验室,长沙 410083)

摘 要: 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。

 

关键词: Ti-55531;近β钛合金;冷轧;时效;组织

Cold rolling and its effect on aged microstructure of Ti-55531 near β titanium alloy
CHEN Fu-wen, ZHANG Xiao-yong, LI Zhi-you, ZHOU Ke-chao

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract: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.

 

Key words: Ti-55531; near β titanium alloy; cold rolling; aging treatment; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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