Study on the Effect of Arc Mode on the Interface Microstructure and Mechanical Behavior of Ti / Al Heterogeneous Alloy Direct Additive Manufacturing

doi:10.3901/JME.2025.09.199

Abstract

Abstract: In the direct manufacturing process of Ti/Al bi-alloys, brittle intermetallic compounds are easily formed at the interface, resulting in cracking and failure of integrated heterogeneous components. The 5B06 aluminum alloy is directly formed on forged TC4 alloy by cold metal transfer + pulse (CMT+P) additive manufacturing technologies, and heteroalloy components with good mechanical properties are obtained. Precipitation and growth of brittle intermetallic compounds at the Ti/Al interface were inhibited by optimizing the process, and a serrated transfer layer with a thickness of several micros is formed at the interface; It is found that in CMT+P mode, the shear stress caused by pulse current had a great impact on the dendrites in the molten pool, which promoted the forced convection of liquid metal in the molten pool, and the dendrites at the interface are broken into fine equiaxed grains, and the long needle-like precipitates grown from the titanium alloy surface decreased obviously. At the same time, the pulsed current played a role in refining grain sizes, and the grain size at the interface is refined to 4.1 μm. In the CMT+P mode, with the increasing of wire feeding speed, the mechanical properties are improved. Under the shear force, the fractures changed from brittle to brittle/ductile mixed fracture. The results provided a new way for improving the mechanical properties of titanium/aluminum heterogeneous alloy components formed by integrated forming.

Key words: Ti / Al heterogeneous alloy, cold metal transfer+pulse, interface microstructure, mechanical property

CLC Number:

V261
TG444

QIN Lanyun, YUAN Xilian, ZHAO Shuo, YANG Guang, WANG Xiangming. Study on the Effect of Arc Mode on the Interface Microstructure and Mechanical Behavior of Ti / Al Heterogeneous Alloy Direct Additive Manufacturing[J]. Journal of Mechanical Engineering, 2025, 61(9): 199-210.

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