Aluminum Alloy Plastic Worked Article with Strain Portions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aluminum alloy plastic worked articles made from Al—Mg—Si-based alloys face challenges in maintaining strength and corrosion resistance when reduced in thickness, particularly in severe corrosive environments, due to the degradation of grain boundary corrosion and stress corrosion cracks.
Innovation Solution
The development of an aluminum alloy plastic worked article with a specific composition and texture state, featuring strain portions with non-recrystalline and fine crystalline textures, and a manufacturing process involving plastic working, solution treatment, water quenching, and artificial age hardening, which maintains a preferable aluminum texture state and enhances strength and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of aluminum alloy plastic worked articles is reduced to achieve weight reduction, then the weight decreases, but the strength and corrosion resistance deteriorate
Solution Approach 1:
The invention changes the microstructural parameters of the aluminum alloy by controlling the texture state (maintaining non-recrystalline texture with specific orientation relationships) and crystal grain size (500 μm or less). This allows thin-walled structures to maintain high strength through optimized material microstructure rather than relying on thickness alone.
2Weight of moving object
If the thickness of aluminum alloy plastic worked articles is reduced to achieve weight reduction, then the weight decreases, but the corrosion resistance deteriorates
Solution Approach 1:
The invention optimizes microstructural parameters including maintaining non-recrystalline texture and controlling crystal grain size to 500 μm or less. This refined microstructure reduces grain boundary area and improves corrosion resistance, enabling thin-walled structures to resist corrosion effectively despite reduced thickness.
3Strength
If the Cu element addition amount is increased to improve strength, then the strength improves, but the sensibility to grain-boundary corrosion increases
Solution Approach 1:
The invention creates local quality differences by maintaining non-recrystalline texture in specific regions and controlling the distribution and size of crystallized materials. This localized microstructural control prevents uniform grain-boundary corrosion while maintaining strength, allowing the use of Cu elements without uniformly increasing corrosion susceptibility throughout the material.
Solution Approach 2:
The invention performs preliminary action by controlling the texture state and crystal grain size before corrosion can occur. By maintaining non-recrystalline texture and limiting grain size to 500 μm or less, the material is pre-conditioned to resist grain-boundary corrosion, preventing the harmful effects of Cu element addition before they can manifest.
4Reliability
If the crystal grain diameter is decreased to prevent grain-boundary corrosion, then the corrosion resistance improves, but the manufacturing complexity increases
Solution Approach 1:
The invention achieves fine crystal grain size (500 μm or less) through controlled plastic working and heat treatment parameters. By optimizing these processing parameters, the complex task of grain refinement is accomplished through standard manufacturing processes rather than requiring complex additional equipment or procedures.
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 achieves a tensile strength of 380 MPa or more, a 0.2%-proof stress of 350 MPa or more, and an elongation of 10.0% or more, while maintaining excellent corrosion resistance, allowing for weight reduction and expanded application in transport apparatus components.
Implementation Method 1
a solution treatment, a water quenching treatment, and an artificial age hardening treatment are performed
Implementation Method 2
a solution treatment, a water quenching treatment, and an artificial age hardening treatment are performed
Implementation Method 3
a solution treatment, a water quenching treatment, and an artificial age hardening treatment are performed
Implementation Method 4
strain portions in each of which an equivalent strain of up to 4.0 mm/mm generated by plastic working is present
Data Source
AI summary
An aluminum alloy plastic worked article including a plastic worked portion formed of a thinned portion 22 formed by plastic working and rib portions 21 formed at two ends of this thinned portion 22 having an approximately H-shaped or U-shaped cross-section. The plastic worked portion is a plastic worked portion 2 having strain portions 23 in each of which an equivalent strain of up to 4.0 mm/mm generated by plastic working is present, and the strain portions 23 are each located in the vicinity of the surface of the plastic worked portion 2 at a boundary between the thinned portion 22 and each of the rib portions 21 and are each formed of a non-recrystalline texture N of aluminum which is not recrystallized or formed of the non-recrystalline texture N and a fine crystalline texture M which is recrystallized but has a crystal grain of 500 μm or less.