Pulse-Assisted Roll Bonding for Stable Magnesium-Titanium Plates
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Solution Overview
Problem
Existing methods for preparing magnesium/titanium composite plates with a large thickness ratio face issues such as unstable bonding interfaces, cracking of titanium thin plates, complex process parameter settings, and limitations in industrial mass production, particularly in explosive welding, hot rolling bonding, and diffusion bonding.
Innovation Solution
A pulse current-assisted roll bonding method involving pre-treatment, pulse current application, rolling, and post-treatment to create a magnesium/titanium composite plate with a large thickness ratio, utilizing an intermediate transition layer and controlled pulse current parameters to enhance bonding and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional roll bonding method is used to bond magnesium plate with titanium thin plate, then bonding interface stability is poor, but the titanium thin plate is crushed and cracked during rolling with large reduction
Solution Approach 1:
The patent applies pulse current to the magnesium plate before rolling to preheat and soften the material. This preliminary thermal treatment reduces the deformation resistance of the magnesium plate, allowing it to better accommodate the titanium thin plate during subsequent rolling without causing crushing or cracking, while still achieving stable bonding at the interface
Solution Approach 2:
The patent changes the physical state and properties of the magnesium plate by applying pulse current, which temporarily alters its temperature and deformation characteristics. This parameter change enables the magnesium plate to become more ductile and compliant during the bonding process, preventing damage to the titanium thin plate while ensuring reliable interface bonding
2Productivity
If explosive welding method is used to bond magnesium and titanium plates, then bonding speed is fast, but bonding interface stability is poor due to conventional incompatibility between titanium and magnesium
Solution Approach 1:
The patent introduces an intermediate transition layer between the magnesium plate and titanium thin plate. This intermediate layer acts as a mediator that is compatible with both materials, facilitating stable bonding at the interface while maintaining the high productivity benefits of the roll bonding process. The intermediate layer prevents direct incompatibility issues between titanium and magnesium
3Reliability
If diffusion bonding method is used to join dissimilar materials, then bonding quality is improved, but production time is long and product size and shape are limited
Solution Approach 1:
The patent replaces the slow thermal diffusion process with a mechanical roll bonding process assisted by pulse current. Instead of relying on slow atomic diffusion over extended periods, the method uses mechanical rolling combined with pulse current-induced thermal softening to achieve rapid bonding. This substitution dramatically reduces production time while maintaining bonding quality and removing size/shape limitations
4Strength
If hot rolling bonding method is used to bond metal plates, then bonding strength is improved through plastic deformation, but process parameter setting is complicated and titanium thin plate is easy to break
Solution Approach 1:
The patent extracts and isolates the most critical function from the complex hot rolling process - the plastic deformation needed for bonding. By applying pulse current to selectively soften the magnesium plate before rolling, the method achieves effective plastic deformation and bonding strength without needing to control multiple complex parameters such as rolling temperature, speed, and reduction rate simultaneously. This simplifies the process while maintaining bonding strength
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
The method achieves stable bonding interfaces, reduces deformation resistance, and enables efficient mass production of magnesium/titanium composite plates with improved mechanical properties and reduced edge cracking.
Implementation Method 1
applying the pulse current, making the current vertically introduced into the magnesium/titanium composite plate, electrifying and heating
Implementation Method 2
improving the rolling composite process by using electro-plasticity, and effectively promoting the dislocation and super-dislocation movement ability of metal materials during composite
Data Source
AI summary
A pulse current-assisted roll bonding method for a magnesium/titanium composite plate with a large thickness ratio is provided. The specific steps are as follows: 1, pre-treating a slab; 2, applying a pulse current; 3, rolling and bonding; and 4, post-treating the slab. The magnesium/titanium composite plate with the large thickness ratio is obtained.