Molecular Dynamics Simulation on the Interfacial Behavior of Mg/Mg-Zn-Al Brazing with Ultrasonic Assistance
Received date: 2024-01-23
Revised date: 2024-07-03
Online published: 2024-10-21
Magnesium alloys are characterized by low density, high specific strength, high specific modulus, and excellent heat dissipation, which have garnered increasing attention from both academia and industry. Brazing, as a metal and alloy joining technique, is highly valued for its stability in forming and its ability to preserve the microstructure and properties of the base metal. However, due to magnesium's high chemical activity, low melting point, high thermal and electrical conductivity, and tendency to oxidize easily, selecting and designing suitable solder for the brazing process present significant challenges. The Mg-Zn-Al alloy, with its low melting point and composition matching the base metal, is considered a suitable filler metal for brazing magnesium alloys. To study the interfacial diffusion behavior of the molten Mg-Zn-Al alloy during the brazing of Mg-based metals and the influence of the ultrasonic-assisted vibration parameters on the brazing process, a Mg/Mg-Zn-Al interface molecular model was constructed to study the microscopic mechanisms involved. The diffusion behavior at the Mg/Mg-Zn-Al interface was simulated using molecular dynamics on the nanoscale, exploring how ultrasonic assistance on the mechanical properties of the interface, including an analysis of the temperature and strain rate response at the brazing interface under ultrasonic assistance. The results show that ultrasonic assistance increases the diffusion coefficient of the system by 5-10 times and the thickness of the bonding layer by 2.5-7.6 times, significantly lowering the required brazing temperature. Furthermore, while both ultrasonic frequency and amplitude enhance interface equilibrium, increasing the ultrasonic frequency leads to a thicker and more uniformly distributed bonding layer. In terms of mechanical properties, the tensile strength of the ultrasonic-assisted brazing interface, with an amplitude of 0.2 nm and a frequency of 1000 GHz, is 11.5% higher than that of a high-temperature brazing interface. Meanwhile, compared with the mechanical behavior of the interface under various loading conditions, the mechanical properties of the brazing interface are more temperature-sensitive than strain-rate-sensitive, with high-temperature conditions amplifying strain-rate sensitivity for maximum tensile stress.
JIANG Guolong , ZHOU Xia . Molecular Dynamics Simulation on the Interfacial Behavior of Mg/Mg-Zn-Al Brazing with Ultrasonic Assistance[J]. Acta Metall Sin, 2026 , 62(2) : 372 -382 . DOI: 10.11900/0412.1961.2024.00022
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