Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

doi:10.1007/s40195-019-00906-2

Abstract

Abstract:

Diffusion bonding of refractory Nb-Si-based alloy was performed with Ni/Al and Ti/Al nanolayers under the condition of 1473 K/30 MPa/60 min. The Nb_SS/Nb₅Si₃ in situ composite with the nominal composition of Nb-22Ti-16Si-3Cr-3Al-2Hf was used as the parent material. The joint microstructures were examined by using a scanning electron microscope eqsuipped with an X-ray energy dispersive spectrometer. Shear test was conducted for the bonded joints at room temperature. Within the joint bonded with Ni/Al multilayer, element diffusion occurred between the base metal and the nanolayer, with the reaction products of AlNb₂?+?Ni₃Al, NiAl and AlNi₂Ti phases. The average shear strength was 182 MPa. While using Ti/Al multilayer, the interface mainly consisted of TiAl, (Ti,Nb)Al and (Ti,Nb)₂Al phases, and the corresponding joints exhibited an increased strength of 228 MPa. In this case, the fracture mainly took place in the TiAl phase and presented a typical brittle characteristic.

Key words: Nb_SS/Nb₅Si₃ composite, Diffusion bonding, Nanolayer, Shear strength

Xin-Yu Ren, Hai-Shui Ren, Yong-Wang Kang, Hua-Ping Xiong, Chong Pei, Bo Chen, Yao-Yong Cheng, A. I. Ustinov. Solid-State Diffusion Bonding of Nb_SS/Nb₅Si₃ Composite Using Ni/Al and Ti/Al Nanolayers[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(9): 1142-1150.

Figures/Tables 12

Fig. 1 Microstructure a and XRD pattern b of the NbSS/Nb5Si3 base metal

Table 1 EDS analysis results for the microzones marked with 1, 2, 3 and 4 in Fig. 1a

Microzone	Concentration (at.%)							Deduced phases
Microzone	Nb	Ti	Si	Al	Cr	Hf	O	Deduced phases
1	42.58	14.33	41.90	1.19	-	-	-	(Nb,Ti)₅Si₃
2	56.49	30.39	-	5.14	7.98	-	-	(Nb,Ti)_SS
3	41.11	11.83	44.08	2.98	-			(Nb,Ti)₅Si₃
4	-	-	-	-	-	31.92	68.08	HfO₂

Fig. 2 Ni/Al a and Ti/Al b nanolayers, and the corresponding cross-sectional morphologies c, d

Fig. 3 Illustration of joint specimens a and shear test b

Fig. 4 Back-scattered electron image of NbSS/Nb5Si3 joint bonded with Ni/Al nanolayer a, and microstructure details at a high magnification of the selected area (rectangle in a) b

Fig. 5 Microstructure of NbSS/Nb5Si3 joint bonded with Ni/Al nanolayer and area distribution maps of elements Nb, Ni, Ti, Si, Al and Cr

Table 2 EDS analysis results for the microzones in Fig. 4b

Microzone	Concentration (at.%)								Deduced phases
Microzone	Nb	Ti	Ni	Si	Al	Cr	Hf	O	Deduced phases
1	4.66	23.78	42.66	1.96	26.94	-	-	-	AlNi₂Ti
2	2.59	22.74	49.84	-	23.91	-	0.92	-	AlNi₂Ti
3	27.13	6.46	32.51	4.14	25.88	3.38	0.50	-	AlNb₂?+?Ni₃Al
4	32.29	6.40	23.79	7.51	24.79	5.22	-	-	AlNb₂?+?Ni₃Al
5	-	6.08	45.17	-	48.75	-	-	-	NiAl dissolved with Ti
6	-	-	5.42	-	-	-	32.47	62.11	HfO₂
7	43.70	22.32	6.60	27.38	-	-	-	-	(Nb,Ti)_SS/Nb₅Si₃ dissolved with Ni
8	54.78	12.03	7.94	25.25	-	-	-	-	(Nb,Ti)_SS/Nb₅Si₃ dissolved with Ni
9	37.62	16.36	19.65	6.87	11.43	8.07	-	-	Reaction products of Ni-Al and (Nb,Ti)-rich phase
10	42.83	12.49	21.12	8.36	11.78	3.42	-	-	Reaction products of Ni-Al and (Nb,Ti)-rich phase

Fig. 6 Morphology a and XRD pattern b of the fracture surface after shear test (Ni/Al nanolayer, bonded at 1473 K/30 MPa/60 min)

Fig. 7 Back-scattered electron image of NbSS/Nb5Si3 joint bonded with Ti/Al nanolayer a, and magnification of the bonding seam b

Table 3 EDS analysis results for the microzones in Fig. 7b

Microzone	Concentration (at.%)				Deduced phases
Microzone	Nb	Ti	Si	Al	Deduced phases
1	-	50.60	-	49.40	TiAl
2	13.61	42.74	-	43.65	(Ti,Nb)Al
3	18.33	46.09	-	35.58	(Ti,Nb)Al
4	15.71	35.93	-	48.36	(Ti,Nb)Al
5	30.22	34.31	-	35.47	(Ti,Nb)₂Al
6	31.43	30.53	4.52	33.52	(Ti,Nb)₂Al
7	31.89	32.13	-	35.98	(Ti,Nb)₂Al
8	47.35	12.51	37.86	2.28	(Nb,Ti)₅Si₃

Fig. 8 Element area distribution maps of Nb, Ti, Al and Si for the joint in Fig. 7b

Fig. 9 SEM photo a and XRD pattern b of the fracture surface after shear test (Ti/Al nanolayer, bonded at 1473 K/30 MPa/60 min)

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Solid-State Diffusion Bonding of Nb_SS/Nb₅Si₃ Composite Using Ni/Al and Ti/Al Nanolayers

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