STRAIN FIELD AND FRACTURE BEHAVIOR OF Ti/Al DISSIMILAR ALLOY JOINT UNDER IN SITU TENSILE TEST

doi:10.11900/0412.1961.2016.00103

Acta Metall Sin

2016, Vol. 52

Issue (11): 1403-1412 DOI: 10.11900/0412.1961.2016.00103

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STRAIN FIELD AND FRACTURE BEHAVIOR OF Ti/Al DISSIMILAR ALLOY JOINT UNDER IN SITU TENSILE TEST

Zhiwu XU¹,Zhipeng MA^1,²,Jiuchun YAN¹,Yuku ZHANG²,Xuyun ZHANG²

1 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
2 Department of Materials Science and Engineering, Northeast Petroleum University, Daqing 163318, China

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Zhiwu XU,Zhipeng MA,Jiuchun YAN,Yuku ZHANG,Xuyun ZHANG. STRAIN FIELD AND FRACTURE BEHAVIOR OF Ti/Al DISSIMILAR ALLOY JOINT UNDER IN SITU TENSILE TEST. Acta Metall Sin, 2016, 52(11): 1403-1412.

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Abstract

The prospect of joining titanium and aluminum components into structures is desirable for a wide range of aerospace and automobile industry applications. One of the problems related with the joining processes for dissimilar metals such as Ti and Al is the formation of residual stress in the bonded joint, which has significant effect on the joint mechanical properties. In this work, joining of a titanium alloy to an aluminum alloy by ultrasonic assisted brazing using a Zn-Al filler metal was investigated. The microstructures of the titanium/aluminum brazed joints were determined by OM, SEM and TEM. The local tensile deformation characteristics of the brazed joints were also examined using the digital image correlation (DIC) methodology by mapping the local strain distribution during in situ tensile tests. The results showed that the Ti₇Al₅Si₁₂ phase and the TiAl₃ phase were formed at the titanium/brazing seam interface. The brazing seam was primarily composed of a Zn-rich phase and a Zn-24.14%Al (mass fraction) eutectoid structure. At the aluminum/brazing seam interface, no interfacial reaction layer was observed and the primary phase Zn-Al dendrites nucleated at the aluminum base metal and grew into the inside of the bonding region. A diffusion layer was formed in the aluminum base metal. It was found that the tensile deformation of the brazed joints was highly heterogeneous, which led to the deflection of the crack during propagating in the joint. The fracture initiated at the Zn-rich phases, where contained the highest stress concentration due to their low elastic modulus, and propagated in the Zn-rich phases or through the interface between Zn-rich phase and Zn-Al eutectoid structure.

Key words: Ti/Al dissimilar alloy, in situ tensile, strain field, fracture behavior

Received: 28 March 2016

Fund: Supported by National Natural Science Foundation of China (Nos.51075104 and 50905044)

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	Zhiwu XU
	Zhipeng MA
	Jiuchun YAN
	Yuku ZHANG
	Xuyun ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00103 OR https://www.ams.org.cn/EN/Y2016/V52/I11/1403

Fig.1 Schematic of ultrasonic assisted brazing

Fig.2 Macrostructure of in suit tensile sample

Table 1 EDS analyses of different locations in Fig.3

(mass fraction / %)

Fig.3 SEM images of Ti/Al dissimilar alloy brazed joint (a) and the interfacial zone close to Ti alloy of the joint (b) (Inset in Fig.3a shows the bright field TEM image in the rectangular area and the insets in Fig.3b show the corresponding SAED patterns in the circle areas)

Fig.4 Force-extension curve of Ti/Al dissimilar alloy brazed joint

Fig.5 Typical crack path of Ti/Al dissimilar alloy brazed joint (a), the local magnification of crack (b) and fractograph of Ti side in the joint (c)

Table 2 Nano-indentation hardness and elastic modulus of brazed joint of Ti/Al dissimilar alloy

Fig.6 SEM-BSE images of Ti/Al dissimilar alloy brazed joint at the same area showed by rectangular area under the loading of 200 N (a), 400 N (b) and 480 N (c)

Fig.7 2D (a, b) and 3D (c, d) strain profiles of Ti/Al dissimilar alloy brazed joint in the parallel tensile direction (a, c) and vertical tensile direction (b, d) under the loading of 200 N

Fig.9 2D (a, b) and 3D (c, d) strain profiles of Ti/Al dissimilar alloy brazed joint in the parallel tensile direction (a, c) and in the vertical tensile direction (b, d) under the loading of 480 N

Fig.8 2D (a, b) and 3D (c, d) strain profiles of Ti/Al dissimilar alloy brazed joint in the parallel tensile direction (a, c) and vertical tensile direction (b, d) under the loading of 400 N

Fig.10 Superposition maps of strain profiles and SEM-BSE images of Ti/Al dissimilar alloy brazed joint under the loading of 200 N (a), 400 N (b) and 480 N (c)

Fig.11 Schematic of the cracking path perpendicular to the interface (a) and parallel to the interface (b) of Ti/Al brazed joint (G—energy release rate of main crack; G^kink—energy release rate of the secondary crack; G^t(Ω)—energy release rate at the crack tip after crack deflection; α—mismatch parameter in the interface; Ω—angle of crack deflection)

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