Magnesium Alloy Sheet Composition for Room-Temperature Formability
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Solution Overview
Problem
Magnesium alloy sheets face challenges in moldability at room temperature due to their HCP structure and limited deformation mechanisms, leading to difficulties in commercial application, particularly in the vehicle industry, where they tend to crack during deformation and have limited dome height and anisotropic properties.
Innovation Solution
A magnesium alloy sheet composition of 0.5 to 3.5 wt% Al, 0.5 to 1.5 wt% Zn, 0.1 to 1.0 wt% Ca, 0.01 to 1.0 wt% Mn, with a cumulative reduction ratio of 86% or higher, processed through homogenization, heat-treatment, rolling, and annealing to control crystal grain size and reduce secondary phase segregation, enhancing moldability and reducing anisotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If magnesium alloy sheet is deformed at room temperature, then deformation mechanism is limited, but moldability is poor and cracks occur
Solution Approach 1:
The patent applies parameter changes by modifying the alloy composition parameters (adding specific elements like Al, Zn, Ca, Mn within defined ranges) and processing parameters (cumulative reduction ratio of 86% or more, homogenization temperature of 300-500°C, annealing temperature of 200-400°C) to enable room temperature deformation. This resolves the contradiction by changing material parameters rather than temperature, achieving both room temperature processing and good moldability.
2Manufacturing precision
If cumulative reduction ratio is increased to control crystal grain size, then moldability is improved, but anisotropy increases
Solution Approach 1:
The patent uses parameter changes by optimizing the cumulative reduction ratio to 86% or more while controlling the alloy composition parameters. This specific combination of parameters achieves fine crystal grain size (3-15 μm) while minimizing anisotropy through the synergistic effect of alloying elements and processing parameters.
Solution Approach 2:
The patent applies composite materials principle by creating a multi-element alloy system (Mg-Al-Zn-Ca-Mn) where each element contributes specific properties. The combination of these elements works synergistically to achieve both fine grain structure and reduced anisotropy, resolving the contradiction between manufacturing precision and compositional stability.
3Reliability
If alloy composition is modified to improve moldability, then deformation performance is enhanced, but crack generation occurs during transverse deformation
Solution Approach 1:
The patent applies composite materials by formulating a multi-element alloy (Mg with Al, Zn, Ca, Mn) where each element provides specific functions. Al and Zn enhance deformation performance, while Ca and Mn improve crack resistance. This composite alloy system resolves the contradiction by distributing functions across multiple elements rather than relying on a single element.
Solution Approach 2:
The patent applies local quality by creating specific microstructural features through the alloy composition and processing. The controlled distribution of secondary phases and fine crystal grains (3-15 μm) created by the 86%+ cumulative reduction ratio provide local regions that resist crack propagation while maintaining overall deformation performance.
4Stability of the object's composition
If homogenization and heat-treatment are performed to reduce secondary phase segregation, then uniformity is improved, but processing time and complexity increase
Solution Approach 1:
The patent applies parameter changes by optimizing the homogenization parameters (temperature of 300-500°C, time of 4-30 hours) and heat-treatment parameters (annealing at 200-400°C). These specific parameter ranges achieve effective secondary phase dispersal while controlling processing complexity through well-defined temperature-time windows.
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 solution provides a magnesium alloy sheet with improved moldability at room temperature, reduced anisotropy, and increased bending radius, allowing for crack-free deformation and enhanced applicability in vehicle parts without generating cracks during stretching and bending.
Implementation Method 1
homogenizing and heat-treating the casting material
Implementation Method 2
homogenizing and heat-treating the casting material; preparing a rolled material by rolling the homogenized and heat-treated casting material; and finally annealing the rolled material
Implementation Method 3
preparing a rolled material by rolling the homogenized and heat-treated casting material
Implementation Method 4
a cumulative reduction ratio in a rolling step for preparing a rolled material from the homogenized and heat-treated casting material may be equal to or greater than 86%
Implementation Method 5
finally annealing the rolled material
Data Source
AI summary
The present invention relates to a magnesium alloy sheet and a manufacturing method thereof. In detail, the magnesium alloy sheet includes 0.5 to 3.5 wt % of Al, 0.5 to 1.5 wt % of Zn, 0.1 to 1.0 wt % of Ca, 0.01 to 1.0 wt % of Mn, a remainder of Mg, and other inevitable impurities with respect to an entire 100 wt % of a magnesium alloy sheet, wherein an average crystal grain size of the magnesium alloy sheet is 3 to 15 μm, the magnesium alloy sheet includes a stringer, and a length of the stringer in a rolling direction (RD) is equal to or less than the maximum value of 50 μm.