Aluminium alloy and aluminium alloy strip for pedestrian impact protection

An aluminium alloy with controlled Si, Fe, Mn, Mg, Cu, Cr, and Ti composition addresses the challenge of maintaining strength and formability in pedestrian impact protection, offering reduced hardening and improved recyclability through conventional manufacturing.

US20260152829A1Pending Publication Date: 2026-06-04HYDRO ALUMINIUM ROLLED PRODUCTS GMBH
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
HYDRO ALUMINIUM ROLLED PRODUCTS GMBH
Filing Date
2025-11-21
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing aluminium alloys used for pedestrian impact protection in vehicles face challenges in achieving moderate strength with low hardening tendencies, particularly after heat treatment, and are prone to complex and costly manufacturing methods, which affect their workability and recyclability.

Method used

An aluminium alloy with specific composition ranges of Si, Fe, Mn, Mg, Cu, Cr, and Ti, optimized to minimize hardening effects, allowing for conventional manufacturing processes that maintain strength and formability, suitable for pedestrian impact protection.

Benefits of technology

The alloy exhibits reduced hardening even under heat stress, ensuring consistent energy absorption capacity and ease of recycling, while maintaining sufficient tensile strength for automotive applications.

✦ Generated by Eureka AI based on patent content.

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Abstract

A method for manufacturing an aluminum alloy strip. In the method, a rolling ingot or strip is cast having a composition: 0.40 wt %≤Si≤0.55 wt %, 0.15 wt %≤Fe≤0.25 wt %, Cu≤0.06 wt %, 0.20 wt %≤Mn≤0.40 wt %, 0.33 wt %≤Mg≤0.40 wt %, Cr≤0.03 wt %, 0.005 wt %≤Ti≤0.10 wt %, the remainder being Al and unavoidable impurities. The cast ingot is hot rolled at 280° C. to 550° C. A solution heat treatment is conducted at at least 480° C. for at least 20 s, and the aluminum alloy strip is quenched to provide a T4 temper state with a yield strength Rp0,2 of 55 MPa to 70 MPa and a tensile strength Rm of 130 MPa to 160 MPa measured transverse to the rolling direction.
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