Influences of High Magnetic Heat Treatment Interfacial Microstructure and Properties of TiAl/Ti2AlNb Diffusion Bonding Joint
-
摘要: 为探讨强磁场对TiAl/Ti2AlNb合金连接界面组织和力学性能的影响规律,对TiAl/Ti2AlNb合金扩散连接接头进行无磁场和强磁场热处理,分析两种不同热处理后连接接头的显微组织,并评价连接接头的力学性能。结果表明:与热处理前相比,两种热处理均可消除连接界面的脆性金属间化合物。与无磁场热处理相比,强磁场热处理可以使连接界面反应层的再结晶晶粒更加细小,靠近TiAl合金侧反应层的脆性α2相弥散分布,靠近Ti2AlNb合金侧的反应层内析出极细小针状的O相,界面处β0/B2相和O相发生了互扩散相变,消除了冶金界面。力学性能测试表明,强磁场热处理后连接接头的抗拉强度和断后伸长率分别为268.76 MPa和0.160%,与无磁场热处理的相比分别提高了54%和202%。强磁场可以加速界面元素扩散,促进界面冶金反应和再结晶,提高界面冶金结合,提升TiAl/Ti2AlNb接头的力学性能,此方法可拓展到其他焊接接头或功能梯度材料的组织及性能调控。
-
关键词:
- TiAl/Ti2AlNb连接接头 /
- 强磁场热处理 /
- 界面显微组织 /
- 抗拉强度 /
- 扩散连接
Abstract: In order to investigate the influence of high magnetic heat treatment on interfacial microstructure and properties of TiAl/Ti2AlNb diffusion bonding joint, the interfacial microstructures and mechanical properties of TiAl/Ti2AlNb diffusion bonding joints are analyzed after heat treatment with and without high magnetic field. Results show that both the two kinds of heat treatment can eliminate the brittle phase in the interface. The heat treatment with high magnetic field can refine the recrystallized grains in the bonding interface, the brittle α2 phase near the TiAl alloy is distributed depressively, the precipitated O phase near the Ti2AlNb alloy is fine and needle-like, and the β0/B2 and O phases interdiffuse at the interface. The heat treatment with high magnetic field can help to eliminate the metallurgical interface and improve the strength and plasticity of the joint. The tensile strength and percentage elongation after fracture of the joint after heat treatment with high magnetic field are 268.76 MPa and 0.160%, respectively, which increase by 54% and 202% compared with those of the heat treatment without magnetic field. High magnetic can accelerate the interfacial element diffusion, promote the interfacial metallurgical reaction, improve the interfacial metallurgical bonding, and strengthen the mechanical properties of TiAl/Ti2AlNb joint. This method can be used to the regulation of microstructures and mechanical properties of other welded joints or functionally graded materials. -
-
[1] HE W W, TANG H P, LIU H Y, et al. Microstructure and tensile properties of containerless near-isotherm-ally forged TiAl alloys[J]. Transactions of Nonferrous Metals Society of China, 2011, 21(12): 2605-2609.
[2] KONG F T, CHEN Y Y, ZHANG D L, et al. High temperature deformation behavior of Ti-46Al-2Cr-4Nb-0.2Y alloy[J]. Materials Science and Engineering: A, 2012, 539: 107-114.
[3] PERRUT M, CARON P, THOMAS M, et al. High temperature materials for aerospace applications: Ni-based superalloys and γ-TiAl alloys[J]. Comptes Rendus Physique, 2018, 19(8): 657-671.
[4] ZHANG Y R, LIU Y C, YU L M, et al. Microstructures and tensile properties of Ti2AlNb and Mo-modified Ti2AlNb alloys fabricated by hot isostatic pressing[J]. Materials Science and Engineering: A, 2020, 776: 139043.
[5] SUN Z, ZHU X X, CHEN H Z, et al. Brazing of TiAl and Ti2AlNb alloys using high-entropy braze fillers[J]. Materials Characterization, 2022, 186: 111814.
[6] 步贤政, 李宏伟, 王志敏, 等. 异种钛合金TA15与Ti2AlNb激光焊接显微组织及力学性能研究[J]. 焊接技术, 2016, 45(3): 9-11. [7] CHEN X, XIE F Q, MA T J, et al. Microstructure evolution and mechanical properties of linear friction welded Ti2AlNb alloy[J]. Journal of Alloys and Compounds, 2015, 646: 490-496.
[8] ZOU G S, XIE E H, BAI H L, et al. A study on transient liquid phase diffusion bonding of Ti-22Al-25Nb alloy[J]. Materials Science and Engineering: A, 2009, 499(1-2): 101-105.
[9] ZHU L, LI J S, TANG B, et al. Microstructure evolution and mechanical properties of diffusion bonding high Nb containing TiAl alloy to Ti2AlNb alloy[J]. Vacuum, 2019, 164: 140-148.
[10] ZHU L, TANG B, WEI B B, et al. Strengthening mechanisms of TiAl/Ti2AlNb diffusion bonding joint after post-bonded heat treatment and hot deformation[J]. Materials Science and Engineering: A, 2021, 825: 141872.
[11] 陈东风, 曹志强, 杨淼, 等. 强磁场在材料科学中的应用现状及理论分析[J]. 钢铁研究, 2007, 35(3): 58-62. [12] 任晓. 强磁场作用下镍系合金元素扩散行为研究[D]. 大连: 大连理工大学, 2010. [13] KUSTOV S, CORRÓ M L, PONS J, et al. Entropy change and effect of magnetic field on martensitic transformation in a metamagnetic Ni-Co-Mn-In shape memory alloy[J]. Applied Physics Letters, 2009, 94(19): 191901.
[14] INOUE K, YAMAGUCHI Y, ISHII Y, et al. Magnetic-field-induced martensitic transformation of offstoichiometric single-crystal Ni2MnGa[J]. Journal of the Physical Society of Japan, 2009, 78(5): 054601.
[15] LUDTKA G M, JARAMILLO R A, KISNER R A, et al. In situ evidence of enhanced transformation kine-tics in a medium carbon steel due to a high magnetic field[J]. Scripta Materialia, 2004, 51(2): 171-174.
[16] HARADA K, TSUREKAWA S, WATANABE T, et al. Enhancement of homogeneity of grain boundary microstructure by magnetic annealing of electrodeposited nanocrystalline nickel[J]. Scripta Materialia, 2003, 49(5): 367-372.
[17] MOLODOV D A, BOLLMANN C, KONIJNENBERG P J, et al. Annealing texture and microstructure evolution in titanium during grain growth in an external magnetic field[J]. Materials Transactions, 2007, 48(11): 2800-2808.
[18] GUBERNATOROV V V, SYCHEVA T S, VLADIMIROV L R, et al. Effects of ion irradiation and magnetic field on primary recrystallization of metals[J]. The Physics of Metals and Metallography, 2009, 107(1): 68-72.
[19] 丁亮. 强磁场下铝合金及钛合金扩散连接行为研究[D]. 上海: 上海交通大学, 2015. [20] BIAN H, LEI Y Z, FU W, et al. Diffusion bonding of Ti2AlNb alloy and high-Nb-containing TiAl alloy: interfacial microstructure and mechanical properties[J]. Metals, 2018, 8(12): 1061.
[21] ZOU J, CUI Y, YANG R. Diffusion bonding of dissimilar intermetallic alloys based on Ti2AlNb and TiAl[J]. Journal of Materials Science & Technology, 2009, 25: 819-824.
计量
- 文章访问数: 16
- HTML全文浏览量: 0
- PDF下载量: 7
下载:
