Al-Cu Clad 2XXX Aerospace Sheet for Corrosion and Forming
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Solution Overview
Problem
The 1XXX-series aluminium alloys used as clad layers in aerospace products are soft and prone to surface damage during handling, leading to issues like die-sticking during forming operations, which compromises their corrosion resistance and fatigue performance.
Innovation Solution
A rolled composite aerospace product is developed using a 2XXX-series core layer coupled with an Al—Cu alloy clad layer, where the Al—Cu alloy has a composition of 0.06% to 2.8% Cu, providing enhanced corrosion resistance and formability, and is bonded to the core layer through roll bonding, followed by solution heat-treating and ageing to achieve improved strength and resistance to surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 1XXX-series aluminium alloy is used as clad layer, then corrosion resistance is improved, but surface damage susceptibility increases
Solution Approach 1:
The patent uses a composite clad layer structure consisting of an inner 1XXX-series aluminium alloy layer for corrosion protection and an outer Al-Cu alloy layer for surface hardness and damage resistance. This composite structure combines the advantages of both materials: the 1XXX-series provides excellent corrosion resistance while the Al-Cu alloy provides surface durability and resistance to die-sticking during forming operations.
2Reliability
If 1XXX-series aluminium alloy is used as clad layer, then corrosion resistance is improved, but die-sticking during forming operations increases
Solution Approach 1:
The composite clad layer with Al-Cu alloy outer layer provides sufficient surface hardness to prevent die-sticking during forming operations, while the inner 1XXX-series layer maintains corrosion resistance. This resolves the contradiction between ease of manufacturing (forming operations) and reliability (corrosion resistance).
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 Al—Cu alloy clad layer significantly reduces die-sticking and surface cracks, enhances fatigue performance, and provides better corrosion resistance, resulting in a stronger and more durable composite aerospace product with improved formability and weight savings.
Implementation Method 1
The clad layer has a corrosion potential of −710 mV or less... the clad layer provides galvanic corrosion protection to the core layer
Implementation Method 2
The Al—Cu alloy clad layer is coupled by means of roll bonding to the at least one surface of the 2XXX-series core layer
Implementation Method 3
followed by solution heat-treating and ageing to achieve improved strength
Implementation Method 4
followed by solution heat-treating and ageing to achieve improved strength
Data Source
AI summary
Provided herein is a rolled composite aerospace product comprising a 2XXX-series core layer and an Al—Cu alloy clad layer coupled to at least one surface of the 2XXX-series core layer, wherein the Al—Cu alloy is an aluminium alloy comprising about 0.06% to 2.8% Cu, and preferably about 0.10% to 1.8% Cu. The rolled composite aerospace product is ideally suitable for structural aerospace parts. Also described herein is a method of manufacturing a rolled composite aerospace product.