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at special B grain cipitation at B grain boundaries in a B metastable titanium alloy. boundaries in an a/B titanium alloy.Acta Mater,2007,55(20): Acta Mater,2013,61(10):3758 6765 [23]van Bohemen S M C,Kamp A,Petrov R H,et al.Nucleation Stanford N,Bate P S.Crystallographic variant selection in Ti- and variant selection of secondary a plates in a B Ti alloy.Acta 6Al-4V.Acta Mater,2004,52(17):5215 Mater,2008,56(20):5907工程科学学报，第 41 卷，第 6 期 ( 2) 经过热处理后，体系内初生 α 相依旧存在， 且趋于等轴化，亚稳定 β 相发生了转变，形成了弥 散分布的平衡状态分解产物，即 α、β 相交互排列的 片层状 β 转变组织． 初生 α 相依旧大量弥散分布于 β 相的晶界上，经过热处理后，处于亚稳状态的高温 β 相发生转变，析出的 α 片层较大，某些 α 片几乎 贯穿整个粗大的晶粒，同时由于缺少初生 α 相对晶 界迁移的阻碍作用，热处理使得 β 转变组织的晶粒 变得更加粗大． 当变形温度超过 TC17 钛合金对应 的 β 相变温度时，淬火态 TC17 合金中初生 α 相完 全回溶到 β 相中，热处理使亚稳态的 β 相转化成片 状 α 相，其晶界 α 相对较粗大． ( 3) 热变形可以改善 TC17 合金的两相取向均 匀性，两相的织构组分增多，分布相对分散，但改善 效果 α 相明显好于 β 相． β 相原本就存在取向上的 “宏区”，一次热变形对其取向的改善效果不佳． 热 变形过程中温度影响了两相取向的均匀性，温度是 通过影响了 α→β 相变程度，间接的影响了取向分 布，故温度对两相的取向分布影响相反，α 相织构极 密度值随温度增大而减小，而 β 相织构极密度值随 温度增大而增大． 参 考 文 献 ［1］ Zhang K，Yang K V，Lim S，et al． Effect of the presence of mac￾rozones on short crack propagation in forged two-phase titanium al￾loys． Int J Fatigue，2017，104: 1 ［2］ Semiatin S L，Bieler T Ｒ． The effect of alpha platelet thickness on plastic flow during hot working of TI--6Al--4V with a transformed microstructure． Acta Mater，2001，49( 17) : 3565 ［3］ Xu G D，Wang F E． Development and application on high-temper￾ature Ti-based alloys． Chin J Ｒare Met，2008，32( 6) : 774 ( 许国栋，王凤娥． 高温钛合金的发展和应用． 稀 有 金 属， 2008，32( 6) : 774) ［4］ Ma S J，Wu X Ｒ，Liu J Z，et al． Influence of microstructures on mechanical properties for TC21 titanium alloy． J Aeron Mater， 2006，26( 5) : 22 ( 马少俊，吴学仁，刘建中，等． TC21 钛合金的微观组织对力 学性能的影响． 航空材料学报，2006，26( 5) : 22) ［5］ Semiatin S L，Knisley S L，Fagin P N，et al． Microstructure evo￾lution during alpha-beta heat treatment of Ti--6Al--4V． Metall Ma￾ter Trans A，2003，34( 10) : 2377 ［6］ Bhattacharyya D，Viswanathan G B，Fraser H L． Crystallographic and morphological relationships between β phase and the Widmansttten and allotriomorphic α phase at special β grain boundaries in an α/β titanium alloy． Acta Mater，2007，55( 20) : 6765 ［7］ Stanford N，Bate P S． Crystallographic variant selection in Ti-- 6Al--4V． Acta Mater，2004，52( 17) : 5215 ［8］ Poorganji B，Yamaguchi M，Itsumi Y，et al． Microstructure evolu￾tion during deformation of a near-α titanium alloy with different in￾itial structures in the two-phase region． Scripta Mater，2009，61 ( 4) : 419 ［9］ He D，Zhu J C，Lai Z H，et al． An experimental study of deform￾ation mechanism and microstructure evolution during hot deforma￾tion of Ti--6Al--2Zr--1Mo--1V alloy． Mater Des，2013，46: 38 ［10］ Sun J Z，Li M Q，Li H． Interaction effect between alpha and be￾ta phases based on dynamic recrystallization of isothermally com￾pressed Ti--5Al--2Sn--2Zr--4Mo--4Cr with basketweave micro￾structure． J Alloys Compd，2017，692: 403 ［11］ Srinivasan S G，Cahn J W，Jónsson H，et al． Excess energy of grain-boundary trijunctions: an atomistic simulation study． Acta Mater，1999，47( 9) : 2821 ［12］ Li L，Luo J，Yan J J，et al． Dynamic globularization and restora￾tion mechanism of Ti--5Al--2Sn--2Zr--4Mo--4Cr alloy during iso￾thermal compression． J Alloys Compd，2015，622: 174 ［13］ Li H M，Li M Q，Luo J，et al． Microstructure and mechanical properties of heat-treated Ti--5Al--2Sn--2Zr--4Mo--4Cr． Trans Nonferrous Met Soc China，2015，25( 9) : 2893 ［14］ Teixeira J D C，Appolaire B，Aeby-Gautier E，et al． Transforma￾tion kinetics and microstructures of Ti17 titanium alloy during continuous cooling． Mater Sci Eng A，2007，448( 1-2) : 135 ［15］ Tarín P，Fernández A L，Simón A G，et al． Transformations in the Ti--5Al--2Sn--2Zr--4Mo--4Cr ( Ti--17) alloy and mechanical and microstructural characteristics． Mater Sci Eng A，2006， 438--440: 364 ［16］ Karthikeyan T，Dasgupta A，Khatirkar Ｒ，et al． Effect of cooling rate on transformation texture and variant selection during β→α transformation in Ti--5Ta--1. 8Nb alloy． Mater Sci Eng A，2010， 528( 2) : 549 ［17］ Xu J W，Zeng W D，Jia Z Q，et al． Microstructure coarsening behavior of Ti--17 alloy with equiaxed alpha during heat treat￾ment． J Alloys Compd，2015，618: 343 ［18］ Park C H，Kim J H，Hyun Y T，et al． The origins of flow soften￾ing during high-temperature deformation of a Ti--6Al--4V alloy with a lamellar microstructure． J Alloys Compd，2014，582: 126 ［19］ Doherty Ｒ D，Hughes D A，Humphreys F J，et al． Current is￾sues in recrystallization: a review． Master Sci Eng A，1997，238 ( 2) : 219 ［20］ Mackenzie L W F，Pekguleryuz M O． The recrystallization and texture of magnesium-zine-cerium alloy． Scripta Mater，2008，59 ( 6) : 665 ［21］ Suwas S，Beausir B，Toth L S，et al． Texture evolution in com￾mercially pure titanium atter warm equal channel angular extru￾sion． Acta Mater，2011，59( 3) : 1121 ［22］ Salib M，Teixeira J，Germain L，et al． Influence of transforma￾tion temperature on microtexture formation associated with α pre￾cipitation at β grain boundaries in a β metastable titanium alloy． Acta Mater，2013，61( 10) : 3758 ［23］ van Bohemen S M C，Kamp A，Petrov Ｒ H，et al． Nucleation and variant selection of secondary α plates in a β Ti alloy． Acta Mater，2008，56( 20) : 5907 · 087 ·