李宏辉,王柯,辛仁龙,刘庆

• 1:重庆大学材料科学与工程学院

摘要(Abstract)：

对具有双态组织的TA19钛合金进行热模拟压缩实验,采用扫描电镜、透射电镜和电子背散射衍射研究了合金变形后的微观组织,并研究了变形温度对合金等轴α相和片层α相演变的影响行为及其机制。结果表明:变形温度对合金的相含量、晶粒形貌、晶界取向差角、以及动态回复和动态再结晶行为都构成显著影响。变形温度较低时(820～860℃),片层α相比等轴α相的塑性变形量大,片层α相向弯曲状形貌转变,且内部发生了明显的动态回复和动态再结晶。变形温度较高时(900～940℃),片层α相在β相中重新析出,表现出平行排布的规则形貌,且晶界取向差角分布图在10°、60°和90°处出现明显的峰值。同时,较高的变形温度促进了等轴α相中的动态再结晶,从而使得大角度晶界增加,而位错密度降低。

关键词(KeyWords)： 钛合金;双态组织;动态再结晶;相变

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51971046)

作者(Author): 李宏辉,王柯,辛仁龙,刘庆

DOI: 10.13289/j.issn.1009-6264.2020-0183

参考文献(References)：

• [1] Banerjee D,Williams J C.Perspectives on titanium science and technology[J].Acta Materialia,2013,61(3):844-879.
• [2] Tarzimoghadam Z,Sandlobes S,Pradeep K G,et al.Microstructure design and mechanical properties in a near-α Ti-4Mo alloy[J].Acta Materialia,2015,97:291-304.
• [3] Li D R,Wang K,Yan Z B,et al.Evolution of microstructure and tensile properties during the three-stage heat treatment of TA19 titanium alloy[J].Materials Science and Engineering A,2018,716:157-164.
• [4] Wen X,Wan M,Huang C,et al.Effect of microstructure on tensile properties,impact toughness and fracture toughness of TC21 alloy[J].Materials & Design,2019,180:107898.
• [5] 龙玮,张松,梁益龙,等.不同片层厚度TC4合金的原位拉伸变形行为[J].材料热处理学报,2019,40(6):61-68.LONG Wei,ZHANG Song,LIANG Yi-long,et al.In-situ tensile deformation behavior of TC4 alloy with different sheet thickness[J].Transactions of Materials and Heat Treatment,2019,40(6):61-68.
• [6] Xu J W,Zeng W D,Ma H Y,et al.Static globularization mechanism of Ti-17 alloy during heat treatment[J].Journal of Alloys and Compounds,2018,736:99-107.
• [7] Gao P,Fu M,Zhan M,et al.Deformation behavior and microstructure evolution of titanium alloys with lamellar microstructure in hot working process:A review[J].Journal of Materials Science and Technology,2020,39(4):56-73.
• [8] Roy S,Suwas S.The influence of temperature and strain rate on the deformation response and microstructural evolution during hot compression of a titanium alloy Ti-6Al-4V-0.1B[J].Journal of Alloys and Compounds,2013,548:110-125.
• [9] Li L,Luo J,Yan J J,et al.Dynamic globularization and restoration mechanism of Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy during isothermal compression[J].Journal of Alloys and Compounds,2015,622:174-183.
• [10] Wang K,Wu M Y,Yan Z B,et al.Dynamic restoration and deformation heterogeneity during hot deformation of a duplex-structure TC21 titanium alloy[J].Materials Science and Engineering A,2018,712:440-452.
• [11] 吴迪鹏,武永,陈明和,等.TC31钛合金板材高温流变行为及组织演变研究[J].稀有金属材料与工程,2019,48(12):3901-3910.WU Di-peng,WU Yong,CHEN Ming-he,et al.High temperature flow behavior and microstructure evolution of TC31 titanium alloy sheets[J].Rare Metal Materials and Engineering,2019,48(12):3901-3910.
• [12] Sun Y,Zhang C,Feng H,et al.Dynamic recrystallization mechanism and improved mechanical properties of a near α high temperature titanium alloy processed by severe plastic deformation[J].Materials Characterization,2020,163:110281.
• [13] Gey N,Humbert M,Gautier E.Study of the β→a variant selection for a zircaloy-4 rod heated to the β transus in presence or not of an axial tensile stress[J].Journal Nuclear Materials,2004,328 (2/3):137-145.
• [14] Zhao Z B,Wang Q J,Hu Q M,et al.Effect of β (110) texture intensity on α-variant selection and microstructure morphology during β→α phase transformation in near α titanium alloy[J].Acta Materialia,2017,126:372-382.
• [15] Semiatin S L,Lehner T M,Miller J D,et al.Alpha/Beta heat treatment of a titanium alloy with a nonuniform microstructure[J].Metallurgical and Transactions A,2007,38(4):910-921.
• [16] Pagan D C,Bernier J V,Dale D,et al.Measuring Ti-7Al slip system strengths at elevated temperature using high-energy X-ray diffraction[J].Scripta Materialia,2018,142:96-100.
• [17] Wang K,Li M Q.Flow behavior and deformation mechanism in the isothermal compression of the TC8 titanium alloy[J].Materials Science and Engineering A,2014,600(10):122-128.
• [18] Yan Z B,Wang K,Zhou Y,et al.Crystallographic orientation dependent crack nucleation during the compression of a widmannstatten-structure α/β titanium alloy[J].Scripta Materialia,2018,156:110-114.
• [19] Lütjering G,Williams J C.Titanium,seconded[M].Berlin:Springer-Verlag,2007.

文章评论(Comment)：