Ti-5Al-5Mo-5V-1Cr-1Fe合金热压缩过程中的形变促进α→β相变（英文）
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摘要
研究Ti-5Al-5Mo-5V-1Cr-1Fe合金在β→α+β相变点以下热缩变形时的动态相变过程。发现在相变点以下0～100 K压缩时会促进应变诱导的α→β相变的发生。压缩过程中的形变储存能为相变提供驱动力。变形过程中位错和亚晶等缺陷增加,促进溶质元素的扩散,溶质元素的重新分布引起两相自由能的重新分布,促进α→β的转变。在{100}取向和{111}取向晶粒中还发现存在取向依赖特征,{111}取向晶粒中不充分的回复为相变提供更大的驱动力。另外,还研究了变形量和应变速率对相变的影响。
The dynamic phase transformation of Ti-5Al-5Mo-5V-1Cr-1Fe alloy during hot compression below the β transus temperature was investigated. Strain-induced α-to-β transformation is observed in the samples compressed at 0-100 K below the βtransus temperature. The deformation stored energy by compression provides a significant driving force for the α-to-β phase transformation. The re-distribution of the solute elements induced by defects during deformation promotes the occurrence of dynamic transformation. Orientation dependence for the α-to-β phase transformation promotion is observed between {100}-orientated grains and {111}-orientated grains. Incomplete recovery in {111}-orientated grains would create a large amount of diffusion channels,which is in favor of the α-to-β transformation. The effects of reduction ratio and strain rate on the dynamic phase transformation were also investigated.
The dynamic phase transformation of Ti-5Al-5Mo-5V-1Cr-1Fe alloy during hot compression below the β transus temperature was investigated. Strain-induced α-to-β transformation is observed in the samples compressed at 0-100 K below the βtransus temperature. The deformation stored energy by compression provides a significant driving force for the α-to-β phase transformation. The re-distribution of the solute elements induced by defects during deformation promotes the occurrence of dynamic transformation. Orientation dependence for the α-to-β phase transformation promotion is observed between {100}-orientated grains and {111}-orientated grains. Incomplete recovery in {111}-orientated grains would create a large amount of diffusion channels,which is in favor of the α-to-β transformation. The effects of reduction ratio and strain rate on the dynamic phase transformation were also investigated.
引文
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[2]ZHEREBTSOV S V,MURZINOVA M A,KLIMOVA M V,SALISHCHEV G A,POPOV A A,SEMIATIN S L.Microstructure evolution during warm working of Ti-5Al-5Mo-5V-1Cr-1Fe at600 and 800°C[J].Materials Science and Engineering A,2013,563:168-176.
[3]FAN Xiao-guang,YANG He,GAO Peng-fei,ZUO Rui,LEIPeng-hui,JI Zhe.Morphology transformation of primary stripαphase in hot working of two-phase titanium alloy[J].Transactions of Nonferrous Metals Society of China,2017,27:1294-1305.
[4]LIANG H Q,GUO H Z.The integrated influence on hot deformation of dual-phase titanium alloys incorporating dynamic recrystallization evolution andα/βphase transformation[J].Materials Letters,2015,151:57-60.
[5]FAN J K,KOU H C,LAI M J,TANG B,CHANG H,LI J S.Hot deformation mechanism and microstructure evolution of a new nearβtitanium alloy[J].Materials Science and Engineering A,2013,584:121-132.
[6]ZENG Zhi-peng,ZHANG Yan-shu,JONSSON S.Deformation behaviour of commercially pure titanium during simple hot compression[J].Materials&Design,2009,30:3105-3111.
[7]HUA Ke,XUE Xiang-yi,KOU Hong-chao,FAN Jiang-kun,TANGBin,LI Jin-shan.Characterization of hot deformation microstructure of a near beta titanium alloy Ti-5553[J].Journal of Alloys and Compounds,2014,615:531-537.
[8]WANG Kai-xuan,ZENG Wei-dong,ZHAO Yong-qing,LAI Yun-jin,ZHOU Yi-gang.Dynamic globularization kinetics during hot working of Ti-17 alloy with initial lamellar microstructure[J].Materials Science and Engineering A,2010,527:2559-2566.
[9]QIN Chun,YAO Ze-kun,NING Yong-quan,SHI Zhi-feng,GUOHong-zhen.Hot deformation behavior of TC11/Ti-22Al-25Nb dual-alloy in isothermal compression[J].Transactions of Nonferrous Metals Society of China,2015,25:2195-2205.
[10]CAI M,LEE C,LEE Y.Effect of grain size on tensile properties of fine-grained metastableβtitanium alloys fabricated by stress-induced martensite and its reverse transformations[J].Scripta Materialia,2012,66:606-609.
[11]SADEGHPOUR S,ABBASI S M,MORAKABATI M.Deformation-induced martensitic transformation in a new metastableβtitanium alloy[J].Journal of Alloys and Compounds,2015,650:22-29.
[12]DEHGHAN-MANSHADI A,DIPPENAAR R J.Strain-induced phase transformation during thermo-mechanical processing of titanium alloys[J].Materials Science and Engineering A,2012,552:451-456.
[13]KOIKE J,SHIMOYAMA Y,OHNUMA I,OKAMURA T,KAINUMA R,ISHIDA K,MARUYAMA K.Stress-induced phase transformation during superplastic deformation in two-phase Ti-Al-Fe alloy[J].Acta Materialia,2000,48:2059-2069.
[14]LIU Bin,LI Yun-ping,MATSUMOTO H,KOIZUMI Y,LIU Yong,CHIBA A.Enhanced grain refinement through deformation inducedαprecipitation in hot working ofα?+?βtitanium alloy[J].Advanced Engineering Materials,2012,14:785-789.
[15]HAN Y,ZHUANG Y H,LU J.Deformation-induced ambient temperatureα-to-βphase transition and nanocrystallization in(α+β)titanium alloy[J].Journal of Materials Research,2009,24:3439-3445.
[16]LIU Bin,LIU Yong,HUANG Lan,LI Hui-zhong,HE Yue-hui.Characterization of phase transformation during hot compressive deformation in aβ-stabilized Ti-45Al-7Nb-0.4W-0.15B alloy[J].Materials Characterization,2015,105:113-117.
[17]NAKAJIMA H,OHSHIDA S,NONAKA K,YOSHIDA Y,FUJITA FE.Diffusion of iron inβTi-Fe alloys[J].Scripta Materialia,1996,34:949-953.