Biomedical Magnesium Alloy Wire Processing for Strength and Corrosion
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Solution Overview
Problem
Existing methods for preparing magnesium alloy wires face challenges in achieving the required strength, plasticity, and corrosion resistance for medical applications, particularly due to limitations in wire forming properties and material processing efficiency.
Innovation Solution
A method combining rolling, mechanical stirring, and drawing processes to optimize the preparation of magnesium alloy wires, which involves smelting and casting the alloy, followed by hot rolling and mechanical stirring to create a stirring plastic deformation zone, and finally drawing the wire with annealing heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional drawing process is used for magnesium alloy wires, then the wire can be produced, but the strength, plasticity, and corrosion resistance are insufficient for medical applications
Solution Approach 1:
The patent applies preliminary action by performing hot rolling and mechanical stirring before the final drawing process. The hot rolling pre-heats and softens the magnesium alloy, making it more formable. The mechanical stirring process creates a refined microstructure with uniform grain distribution before drawing, which improves both the formability during drawing and the final mechanical properties of the wire.
Solution Approach 2:
The patent changes physical parameters by conducting hot rolling at elevated temperatures (typically 300-500°C) to improve ductility and reduce flow stress. The mechanical stirring process also changes the microstructural parameters by creating severe plastic deformation that refines grains and distributes alloying elements uniformly, thereby improving strength and corrosion resistance while maintaining formability.
2Strength
If equal-diameter angular extrusion combined with multi-pass drawing is used, then mechanical and corrosion properties are improved, but the wire size is limited and material processing loss is large
Solution Approach 1:
The patent uses hot rolling as a preliminary action before drawing to reduce the material to the desired cross-sectional area while maintaining a high aspect ratio (plate or strip form). This preliminary reduction allows for more efficient subsequent drawing operations and enables production of larger quantities of material compared to angular extrusion, which is limited in size and generates more waste.
Solution Approach 2:
The patent extracts the extrusion step from the conventional process and replaces it with hot rolling followed by drawing. This removes the limitation of angular extrusion on wire size and reduces material waste, as rolling and drawing are more efficient for producing long, continuous wires in large quantities with minimal material loss.
3Strength
If mechanical stirring process is applied to improve microstructure, then strength and plasticity are enhanced, but the processing complexity increases
Solution Approach 1:
The patent merges the mechanical stirring process with the existing hot rolling and drawing operations into an integrated flow line. The mechanical stirring is performed on the hot-rolled material before drawing, combining multiple functions (heating, stirring, and forming) in a continuous process. This integration reduces the need for separate handling and processing steps, thereby managing complexity while achieving the desired microstructural refinement and property enhancement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly improves the microstructure and performance of magnesium alloy wires, enhancing their strength, plasticity, and corrosion resistance, thus meeting the requirements for medical applications and enabling large-scale production.
Implementation Method 1
the relative motion between the stirring needle and the material is used to cause strong plastic deformation of the material
Implementation Method 2
Process the flat ingots in step (3) into magnesium alloy plates with a thickness of 70-100 mm, a width of 540-730 mm, and a length of 400-1,200 mm by hot rolling
Implementation Method 3
Draw the bar in step (8) into a wire in multiple passes, accompanying annealing heat treatment with the temperature of 280-320° C., the time of 10-60 min
Data Source
AI summary
The disclosure relates to the technical field of preparing the metal material of magnesium alloy, and particularly provides a method for preparing biomedical magnesium alloy wires. The magnesium, zinc, and neodymium alloys are subject to smelting, casting, rolling, and other processes to prepare plates. The plates are subjected to a special mechanical stirring process to prepare a processing zone with the same thickness as the plates. After machining, the processing zone is used as the final product of the wire or drawn in multiple passes to finally form the wire with the required diameter. By introducing rolling and mechanical stirring processes, the disclosure improves the forming property of the wire, so that the alloy grains are significantly refined, the size of the second phase is greatly reduced and most of them are solid-soluble in the matrix, the strength of the obtained wire, and especially the elongation, is greatly improved, and better corrosion resistance is obtained, which meet the performance requirements of medical magnesium alloy wire.