Aluminium-copper-lithium alloy products with improved fatigue properties
US10689739B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2014 |
| Grant date | Jun 23, 2020 |
| Priority date | — |
| Expiry date | Aug 23, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B2003/001
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The disclosure provides for plate having a thickness of at least 80 mm comprising aluminium alloy as a percentage by weight %: Cu: 2.0-6.0; Li: 0.5-2.0; Mg: 0-1.0; Ag: 0-0.7; Zn 0-1.0; and at least one element selected from Zr, Mn, Cr, Sc, Hf and Ti, the amount of said element, if selected, being 0.05 to 0.20 wt % for Zr, 0.05 to 0.8% wt % t for Mn, 0.05 to 0.3 wt % for Cr and for Sc, 0.05 to 0.5 wt % Hf and 0.01 to 0.15% wt % for Ti, Si≤0.1; Fe≤0.1; others ≤0.05 each and ≤0.15 in total, wherein the aged state logarithmic fatigue mean measured at mid-thickness in the LT direction on smooth specimens with a maximum stress amplitude of 242 MPa, a frequency of 50 Hz, a stress ratio of R=0.1 of at least 250,000 cycles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.