Vacuum brazing Ti2AlNb / GH4169 alloy with (TiZrHf)40(NiCu)55Al5 high-entropy amorphous filler metal
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摘要:
设计了一种高熵非晶钎料(TiZrHf)40(NiCu)55Al5对Ti2AlNb合金与GH4169镍基高温合金进行真空钎焊，分析了钎焊工艺对Ti2AlNb合金/GH4169镍基高温合金接头界面组织形貌、力学性能及断裂行为的影响规律. 结果表明，钎焊接头可划分为Ti2AlNb/等温凝固区(I区)/钎缝中心区(II区)/扩散反应区(III区)/GH4169；钎焊接头典型界面组织为Ti2AlNb/B2 + Ti2Ni(Al, Nb)/(Ti, Zr, Hf)(Ni, Cu)/(Ni, Cr, Fe, Ti)ss + Cr-rich(Ni, Cr, Fe)ss + Ni-rich(Ni, Cr, Fe)ss + (Ni, Cr, Fe)ss/GH4169；随钎焊温度升高和保温时间延长，钎焊接头的抗剪强度均呈现出先增大后减小的趋势，当钎焊温度为1 020 ℃、钎焊时间为15 min时，接头的抗剪强度达到最大237 MPa. 断口分析表明，接头主要断裂在Ti2Ni(Al, Nb) + (Ti, Zr, Hf)(Ni, Cu) + (Ni, Cr, Fe, Ti)ss处，并逐渐向扩散反应区扩展，断口形貌呈现出典型的解理断裂特征.
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关键词:
- Ti2AlNb合金 /
- GH4169镍基高温合金 /
- 真空钎焊 /
- 微观组织 /
- 抗剪强度
Abstract:A high-entropy amorphous brazing filler metal (TiZrHf)40(NiCu)55Al5 was designed for vacuum brazing of Ti2AlNb alloy and GH4169 nickel-based superalloy. The effects of brazing parameters on the interfacial microstructure, mechanical properties and fracture behavior of Ti2AlNb alloy/GH4169 nickel-based superalloy brazed joints were studied. The results showed that the brazed joints can be divided into Ti2AlNb/ diffusion reaction zone (zone I)/brazing seam center zone (zone II)/diffusion reaction zone (zone III)/GH4169. The typical interface microstructure of brazed joints was Ti2AlNb/B2 + Ti2Ni(Al, Nb)/(Ti, Zr, Hf)(Ni, Cu)/(Ni, Cr, Fe, Ti)ss + Cr-rich (Ni, Cr, Fe)ss + Ni-rich(Ni, Cr, Fe)ss + (Ni, Cr, Fe)ss/GH4169.With the increase of brazing temperature and brazing time, the shear strength of brazed joints increased first and then decreased. When the brazing temperature was
1020 ℃ and the brazing time was 15 min, the maximum shear strength of 237 MPa was obtained. The fracture analysis showed that the joint was mainly broken at zone of Ti2Ni(Al, Nb) + (Ti, Zr, Hf) (Ni, Cu) + (Ni, Cr, Fe, Ti)ss, and fracture path gradually expanded to the diffusion reaction zone. The fracture morphology showed typical cleavage fracture characteristics.-
Keywords:
- Ti2AlNb alloy /
- GH4169 nickel-base superalloy /
- vacuum brazing /
- microstructure /
- shear strength
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图 3 钎焊装配及剪切夹具示意图
Figure 3. Schematic diagram of brazing assembly and fixture for shear test. (a) brazing assembly; (b) fixture for shear test
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图 5 钎焊接头背散射电子图像
Figure 5. Backscattered electron images of brazed joints. (a) typical interfacial microstructure ; (b) enlarge the image in Fig.5 (a)
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图 6 钎焊接头界面区域元素分布
Figure 6. Elemental distribution in the interfacial zone of brazed joint
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图 7 保温15 min不同钎焊温度接头界面微观组织形貌
Figure 7. Interfacial morphologies of joints brazed at different brazing temperatures for 15 min. (a) 1 005 ℃; (b) 1 020 ℃; (c) 1 035 ℃; (d) 1 050 ℃; (e) 1 065 ℃; (f) 1 080 ℃
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图 8 钎焊温度1 020 oC不同保温时间接头界面微观组织形貌
Figure 8. Interfacial morphologies of joints brazed at different holding time at 1 020 ℃. (a) 5 min; (b) 15 min; (c) 20 min; (d) 25 min; (e) 30 min
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图 9 Ti2AlNb/GH4169钎焊接头微观组织演变示意图
Figure 9. Schematic of Ti2AlNb/GH4169 brazed joint microstructure evolution process. (a) physical contact; (b) filler melting and atomic diffusion; (c) formation of reaction phases;(d) growth and evolution of reaction phases
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图 10 Ti2AlNb/GH4169钎焊接头性能
Figure 10. Shear strength of Ti2AlNb/GH4169 brazed joints. (a) different brazing temperatures; (b) different holding time
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图 11 不同钎焊温度钎焊接头断裂特征
Figure 11. Fracture characteristics of brazed joints at different brazing temperatures. (a) the fracture path; (b) Ti2AlNb side fracture morphology; (c) GH4169 side fracture morphology
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图 12 不同钎焊温度钎焊接头Ti2AlNb侧断口XRD图谱
Figure 12. XRD patterns of Ti2AlNb side fracture of brazed joint at different brazing temperatures
表 1 母材化学成分(质量分数，%)
Table 1 Chemical composition of base metals
材料 Cr Fe Mo Nb Al Ti Ni Ti2AlNb — — — 44 11.4 余量 — GH4169 18.06 18.90 2.96 5.43 0.58 0.94 余量 
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表 2 图5中标记位置的EPMA点元素分析(原子分数，%)
Table 2 EPMA analysis results of the marked locations in Fig. 5
位置 Al Ti Cr Fe Ni Cu Zr Nb Hf 可能相 A 13.89 54.55 0.11 0.40 2.38 0.91 0.19 27.58 — B2 B 14.27 40.70 — 0.61 19.30 5.09 0.91 18.75 0.37 Ti2Ni(Al, Nb) C 11.92 34.93 0.10 1.09 21.17 6.09 1.83 21.68 1.16 Ti2Ni(Al, Nb) D 7.66 20.29 0.90 3.03 32.06 8.35 7.85 13.70 6.16 (Ti, Zr, Hf)(Ni, Cu) E 1.29 17.38 0.19 0.91 42.77 13.09 11.51 2.65 10.20 (Ti, Zr, Hf)(Ni, Cu) F 1.42 22.22 0.45 2.86 44.46 8.65 7.12 2.54 10.27 (Ti, Zr, Hf)(Ni, Cu) G 2.76 31.74 0.41 3.94 41.40 4.91 5.01 3.43 6.40 (Ti, Zr, Hf)(Ni, Cu) H 2.83 30.30 0.83 5.07 41.84 4.25 4.37 2.66 7.86 (Ti, Zr, Hf)(Ni, Cu) I 1.46 13.32 16.67 23.77 27.81 0.67 4.31 5.00 6.10 (Ni, Cr, Fe, Ti)ss J 0.39 3.91 58.36 18.11 10.03 — 1.04 4.55 0.64 Cr-rich(Ni, Cr, Fe)ss K 1.62 6.30 26.75 17.13 40.52 0.15 0.70 4.38 0.19 Ni-rich(Ni, Cr, Fe)ss L — 5.67 36.10 20.53 32.60 — 0.45 2.01 0.16 (Ni, Cr, Fe)ss M 1.61 8.80 20.66 16.88 47.72 0.38 0.88 3.82 0.13 Ni-rich(Ni, Cr, Fe)ss
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表 3 图11中标记位置的EDS点分析(原子分数，%)
Table 3 EDS points analysis results of the marked locations in Fig. 11
位置 Al Ti Cr Fe Ni Cu Zr Nb Hf 可能相 A 11.13 42.12 0.27 1.43 21.92 2.52 1.12 18.32 0.97 Ti2Ni(Al, Nb) B 15.67 37.34 0.14 1.09 19.54 5.32 1.30 18.10 1.47 Ti2Ni(Al, Nb) C 10.04 33.26 1.04 2.33 25.41 3.68 2.16 19.66 2.21 Ti2Ni(Al, Nb) D 9.82 30.29 0.43 1.90 27.04 5.13 2.33 20.59 2.19 Ti2Ni(Al, Nb) E 9.27 34.96 0.29 1.37 27.77 4.06 1.97 18.32 1.67 Ti2Ni(Al, Nb) F 1.79 14.14 17.95 23.42 27.74 0.62 4.15 3.29 6.35 (Ni, Cr, Fe, Ti)ss G 16.97 30.29 1.78 2.99 18.58 4.58 1.93 20.21 2.65 Ti2Ni(Al, Nb) H 19.06 29.44 1.40 2.58 17.51 4.67 1.85 20.98 2.50 Ti2Ni(Al, Nb) I 2.51 17.61 24.28 21.59 21.62 0.19 1.69 8.73 1.78 (Ni, Cr, Fe, Ti)ss J 2.84 16.00 28.38 22.01 18.64 0.42 1.29 8.99 1.43 (Ni, Cr, Fe, Ti)ss
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