Heterogeneous metal solid-phase welding interface intermetallic compound evolution phase field simulation method

Abstract

The invention provides a heterogeneous metal solid-phase welding interface intermetallic compound evolution phase field simulation method. The method comprises the following steps: establishing a conceptual model for intermetallic compound evolution simulation; establishing a microcosmic phase field calculation model for evolution simulation of the intermetallic compound; defining initial conditions of evolution simulation of the intermetallic compound; defining a computational domain, a space step length and a boundary condition of the evolution simulation of the intermetallic compound; establishing thermodynamics, dynamics and crystallography databases of intermetallic compound evolution simulation; and solving the phase field calculation model to obtain a calculation result of the evolution simulation of the intermetallic compound. According to the simulation method disclosed by the invention, the evolution behavior of the solid-phase welding interface intermetallic compound is researched on the microscopic scale, and the influence rule of the welding process on the intermetallic compound is mastered, so that integrated prediction and regulation of multi-scale structure characteristics are realized; the invention has important significance in enriching and developing the interface, diffusion and phase change theory of dissimilar metal materials under complex welding conditions (medium and low temperature, high speed and large deformation).

Description

technical field [0001] The invention relates to the technical field of microstructure simulation of welded joints, in particular to a phase field simulation method for the evolution of intermetallic compounds at the solid-phase welding interface of heterogeneous metals. Background technique [0002] The welding of dissimilar alloys such as aluminum / magnesium, aluminum / titanium, aluminum / steel, and aluminum / copper has a large number of actual and potential application requirements in aerospace, military equipment, rail transit and other manufacturing fields. Solid-phase welding meets the comprehensive requirements for quality, precision and performance of light alloy structural connections, and has become a key processing method for product manufacturing. When brittle phases of intermetallic compounds are produced on the solid-phase welding interface of dissimilar materials, the joints often exhibit poor mechanical properties. Therefore, it is of great practical significance...

AI Technical Summary

Problems solved by technology

[0007] Based on the technical problems existing in the background technology, the present invention proposes a phase field simulation method for the evolution of intermetallic compounds at the solid-phase welding interface of heterogeneous metals, which can scientifically, accurately and comprehensively predict the intermetallic compounds at the solid-phase welding interface of heterogeneous metals and overcame the problems in the prior art of scattered research data on intermetallic compounds at the solid-phase welding interface of heterogeneous metals, low numerical prediction accuracy, and one-sided research information on phase transition thermodynamics, kinetics, and crystallography

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