Calcium-Bearing Mg-RE Alloy Composition for Room-Temperature Formability
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Solution Overview
Problem
Magnesium alloys exhibit poor room temperature formability due to their hexagonal close packed structure and limited slip planes, which restricts their application, and existing advanced processing methods like ECAP and DSR have low production efficiency compared to conventional rolling.
Innovation Solution
Calcium-bearing magnesium and rare earth element alloys with specific compositions (Zn, Al, Ca, Gd, Y, Mn) are developed, combined with conventional rolling, extrusion, and isothermal forging processes to enhance formability, mechanical properties, and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional rolling method is used, then production efficiency is high, but room temperature formability is poor
Solution Approach 1:
The patent changes the chemical composition parameters of the magnesium alloy by adding specific amounts of Ca (0.1-0.4 wt%), Gd (0.1-0.4 wt%), and other elements. This compositional parameter change modifies the material's microstructure and texture characteristics, enabling improved room temperature formability while maintaining compatibility with conventional rolling processes, thus resolving the contradiction between production efficiency and formability.
Solution Approach 2:
The patent creates a composite alloy system by combining magnesium with multiple alloying elements (Ca, Gd, Zn, Al, Mn, RE). This composite material approach leverages the synergistic effects of different elements to achieve both good formability and mechanical properties, allowing conventional rolling to produce high-quality sheets without requiring complex processing methods.
2Reliability
If advanced processing methods (ECAP, CR, ARB, DSR) are used, then room temperature formability is improved, but production efficiency decreases
Solution Approach 1:
The patent applies preliminary action by optimizing the alloy composition before the rolling process. The specific addition of Ca and Gd elements during the melting stage pre-configures the material's microstructure and texture, so that subsequent conventional rolling can achieve good formability without requiring complex post-processing methods like ECAP or DSR, thereby maintaining high production efficiency.
Solution Approach 2:
The patent changes the chemical composition parameters to achieve the desired formability through material design rather than process complexity. By adjusting elemental concentrations (particularly Ca: 0.1-0.4 wt% and Gd: 0.1-0.4 wt%), the alloy's inherent formability is improved, making advanced processing methods unnecessary and thus preserving production efficiency.
3Reliability
If magnesium alloy composition is optimized for formability, then room temperature formability improves, but mechanical properties may be compromised
Solution Approach 1:
The patent applies local quality by assigning different functional roles to different alloying elements. Ca and Gd primarily address formability and texture control, while Zn and Al contribute to strength and mechanical properties, and Mn provides corrosion resistance. This functional distribution across elements allows simultaneous optimization of formability and mechanical properties without compromise.
Solution Approach 2:
The patent uses a multi-element composite alloy system where each component contributes specific properties. The synergistic combination of Mg (base), Ca (formability), Gd (texture control), Zn (strength), Al (mechanical properties), and Mn (corrosion resistance) creates a balanced material that achieves both good room temperature formability and satisfactory mechanical properties through compositional design.
Data Source
AI summary
A calcium-bearing magnesium and rare earth element alloy consists essentially of, in mass percent, zinc (Zn): 1-3%; aluminum (Al): 1-3%; calcium (Ca): 0.1-0.4%; gadolinium (Gd): 0.1-0.4%; yttrium (Y): 0-0.4%; manganese (Mn): 0-0.2%; and balance magnesium (Mg).