Microstructure stability and micro-mechanical behavior of as-cast gamma-TiAl alloy during high-temperature low cycle fatigue

被引:60
作者
Ding, Jie [1 ]
Zhang, Minghe [1 ]
Ye, Teng [1 ]
Liang, Yongfeng [1 ]
Ren, Yang [2 ]
Dong, Chengli [3 ]
Lin, Junpin [1 ]
机构
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[2] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA
[3] Beijing Inst Aeronaut Mat, Natl Key Lab Sci & Technol Adv High Temp Struct M, Beijing 100095, Peoples R China
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
High Nb-containing TiAl alloys; Low cycle fatigue; High-energy X-ray diffraction; Phase transformation; HIGH-NB; PHASE-TRANSFORMATIONS; MECHANICAL-PROPERTIES; OMEGA(O) PHASE; ELASTIC-MODULI; HIGH-STRENGTH; CRACK GROWTH; STRESS RATIO; LIFE; PRECIPITATION;
D O I
10.1016/j.actamat.2017.12.040
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study systematically investigated the low cycle fatigue deformation of a high Nb-containing TiAI alloy with a nominal chemical composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y at 850 degrees C by using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and synchrotron-based high-energy X-ray diffraction (HE-XRD) techniques. Cyclic stress-strain (CSS) behavior, lattice strain, and peak broadening of {100}(alpha 2), {201}(gamma), and {202}(omega o) planes, phase transformations, and crack propagation behavior were obtained for samples with three total strain amplitudes: Delta(epsilon t)/2 = +/- 0.25%, Delta(epsilon t)/2 = +/- 2 = +/- 0.28%, and Delta(epsilon t)/2 = +/- 0.30%. At early deformation stages, alpha(2lamellae) transformed into omega(0) phase with a distinct orientation relationship, and a certain orientation relationship (OR) between them was observed after the following cyclic deformation. Furthermore, gamma particles precipitated within the single omega(o) area. In addition, according to the peak intensity and peak broadening results, the omega(o) -> B2 phase transformation occurred, leading to the appearance of single B2-phase areas. The lattice strains in the omega(o), phase were always in tension during the cyclic deformation and large differences of the lattice strains were found in the gamma phase and alpha(2) phase, not only the values but also the directions, which resulted in crack nucleated at and propagated along the alpha(2)/gamma lamellar interface. This study provides a better understanding of the low cycle fatigue deformation of TiAI alloys. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:504 / 515
页数:12
相关论文
共 47 条
[1]  
Appel F, 2011, GAMMA TITANIUM ALUMINIDE ALLOYS: SCIENCE AND TECHNOLOGY, P1, DOI 10.1002/9783527636204
[2]   Electron microscope characterization of low cycle fatigue in a high-strength multiphase titanium aluminide alloy [J].
Appel, Fritz ;
Heckel, Thomas K. ;
Christ, Hans-Juergen .
INTERNATIONAL JOURNAL OF FATIGUE, 2010, 32 (05) :792-798
[3]   Microstructure-low cycle fatigue behaviour relationships in a PM γ-TiAl alloy [J].
Berteaux, O. ;
Jouiad, M. ;
Thomas, M. ;
Henaff, G. .
INTERMETALLICS, 2006, 14 (10-11) :1130-1135
[4]   Evolution of microstructure and texture in Ti-46Al-9Nb sheet material during tensile flow at elevated temperatures [J].
Bystrzanowski, S. ;
Bartels, A. ;
Stark, A. ;
Gerling, R. ;
Schimansky, F. -P ;
Clemens, H. .
INTERMETALLICS, 2010, 18 (05) :1046-1055
[5]   Micro segregation in high Nb containing TiAl alloy ingots beyond laboratory scale [J].
Chen, G. L. ;
Xu, X. J. ;
Teng, Z. K. ;
Wang, Y. L. ;
Lin, J. P. .
INTERMETALLICS, 2007, 15 (5-6) :625-631
[6]   Microstructural stability of lamellar TiAl-based alloys at high temperature [J].
Chen, GL ;
Zhang, LC ;
Zhang, WJ .
INTERMETALLICS, 1999, 7 (11) :1211-1218
[7]   A novel method for grain refinement and microstructure modification in TiAl alloy by ultrasonic vibration [J].
Chen Ruirun ;
Zheng Deshuang ;
Guo Jingjie ;
Ma Tengfei ;
Ding Hongsheng ;
Su Yanqing ;
Fu Hengzhi .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2016, 653 :23-26
[8]   Monotonic and cyclic properties of TiAl alloys doped with Nb, Mo and C [J].
Chlupova, A. ;
Obrtlik, K. ;
Beran, P. ;
Heczko, M. ;
Polak, J. ;
Kruml, T. .
XVII INTERNATIONAL COLLOQUIUM ON MECHANICAL FATIGUE OF METALS (ICMFM17), 2014, 74 :405-408
[9]   Mechanical properties of high niobium TiAl alloys doped with Mo and C [J].
Chlupova, A. ;
Heczko, M. ;
Obrtlik, K. ;
Polak, J. ;
Roupcova, P. ;
Beran, P. ;
Kruml, T. .
MATERIALS & DESIGN, 2016, 99 :284-292
[10]   Thermomechanical fatigue behaviours of a third generation γ-TiAl based alloy [J].
Cui, W. F. ;
Liu, C. M. ;
Bauer, V. ;
Christ, Ha. .
INTERMETALLICS, 2007, 15 (5-6) :675-678