Ni-Mo-Cr高温合金中Ni_2(Mo,Cr)超点阵相显微结构的研究
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摘要
本文利用扫描电镜和透射电镜,对Ni-20Mo-10Cr(at.%)高温合金中纳米级Ni_2(Cr,Mo)超点阵析出相进行了系统的电子显微学分析,发现Ni_2(Mo,Cr)超点阵相和基体γ相之间存在两种特定的取向关系,分别是:[010]Ni_2(Mo,Cr)//[001]_γ,(002)Ni_2(Mo,Cr)//(220)_γ和[111]Ni_2(Mo,Cr)//[112]_γ,(011)Ni_2(Mo,Cr)//(311)_γ。
The Ni-20 Mo-10 Cr(at.%) superalloy is thermal exposure at 800 ℃ for 20 h. Plenty of nanometer-sized Ni_2(Mo,Cr) superlattice phases precipitated, in which Mo or Cr atoms occupied every three(220)_(Ni) planes regularly. The orientation relationships between the precipitates and the Ni-Mo-Cr matrix are determined as [010]Ni_2(Mo,Cr)//[001]_γ,(002)Ni_2(Mo,Cr)//(220)_γ and [111]Ni_2(Mo,Cr)//[112]_γ,(011)Ni_2(Mo,Cr)//(311)_γ using transmission electron microscopy.
The Ni-20 Mo-10 Cr(at.%) superalloy is thermal exposure at 800 ℃ for 20 h. Plenty of nanometer-sized Ni_2(Mo,Cr) superlattice phases precipitated, in which Mo or Cr atoms occupied every three(220)_(Ni) planes regularly. The orientation relationships between the precipitates and the Ni-Mo-Cr matrix are determined as [010]Ni_2(Mo,Cr)//[001]_γ,(002)Ni_2(Mo,Cr)//(220)_γ and [111]Ni_2(Mo,Cr)//[112]_γ,(011)Ni_2(Mo,Cr)//(311)_γ using transmission electron microscopy.
引文
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[12] KUMAR M, VASUDEVAN V K. Deformation-induced pseudo-twinning and a new superstructure in Ni2Mo precipitates contained in a Ni-25Mo-8Cr alloy[J]. Acta Materialia, 1996, 44(9): 3575-3583.
[13] TURCHI P E A, KAUFMAN L, LIU Z K. Modeling of Ni-Cr-Mo based alloys: Part I—phase stability[J]. Calphad-Computer Coupling of Phase Diagrams and Thermo Chemistry, 2006, 30(1): 70-87.
[2] ZHANG Q, TANG R, YIN K, et al. Corrosion behavior of Hastelloy C-276 in supercritical water[J]. Corrosion Science, 2009, 51(9):2092-2097.
[3] MISHRA A K, RAMAMURTHY S. The activation/depassivation of nickel-chromium-molybdenum alloys in bicarbonate solution: Part I[J]. Electrochimica Acta, 2013, 100(4):118-124.
[4] LI X M, BAI J W, LIU P P, et al. Coherent Ni2(Cr, Mo) precipitates in Ni-21Cr-17Mo superalloy[J]. Journal of Alloys and Compounds, 2013, 559(5):81-86.
[5] LUY L, PIKEL M, BROOKSCR, et al. Strengthening domains in a Ni-21Cr-17Mo alloy[J]. Scripta Materialia, 2007, 56(2):121-124.
[6] BAI J W, YU R, ZHU Y M, et al. Early precipitation of Ni2(Cr,Mo) phase[J]. Materials Science and Engineering A, 2014, 615:1-6.
[7] CHEN Y, HU R, KOUH, et al. Precipitation of nanosized DO 22, superlattice with high thermal stability in an Ni-Cr-W superalloy[J]. Scripta Materialia, 2014, 76(4): 49-52.
[8] KUMAR M, VASUDEVAN V K. Mechanical properties and strengthening of a Ni-25Mo-8Cr alloy containing Ni2(Mo,Cr) precipitates[J]. Acta Materialia, 1996, 44(12):4865-4880.
[9] TAWANCY H M, ABOELFOTOH M O. High strength and high ductility in a nanoscale superlattice of Ni2 (Cr,Mo) deformable by twinning[J]. Scripta Materialia, 2008, 59(8):846-849.
[10] TAWANCY H M, ABOELFOTOH M O. Mechanical properties of ground state structures in substitutional ordered alloys: high strength, high ductility and high thermal stability[J]. Materials Science and Engineering A, 2014, 603(5):121-128.
[11] 饶栋, 陈江华, 杨修波,等. 三级时效7N01铝合金微观结构与力学性能关系的研究[J]. 电子显微学报, 2016, 35(5):379-385.
[12] KUMAR M, VASUDEVAN V K. Deformation-induced pseudo-twinning and a new superstructure in Ni2Mo precipitates contained in a Ni-25Mo-8Cr alloy[J]. Acta Materialia, 1996, 44(9): 3575-3583.
[13] TURCHI P E A, KAUFMAN L, LIU Z K. Modeling of Ni-Cr-Mo based alloys: Part I—phase stability[J]. Calphad-Computer Coupling of Phase Diagrams and Thermo Chemistry, 2006, 30(1): 70-87.