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Aluminum alloy with additions of scandium, zirconium and erbium

A technology for adding elements and aluminum alloys, which is applied in the field of aluminum alloys with scandium, zirconium and erbium addition elements, and can solve the problems of limiting the industrial practicability and high cost of aluminum-scandium alloys

Inactive Publication Date: 2014-12-31
THE BOEING CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, the high cost of scandium limits the industrial applicability of aluminum-scandium alloys

Method used

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  • Aluminum alloy with additions of scandium, zirconium and erbium
  • Aluminum alloy with additions of scandium, zirconium and erbium
  • Aluminum alloy with additions of scandium, zirconium and erbium

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Embodiment

[0055] Alloy 1~3

[0056] Alloy composition and processing

[0057] One ternary and two quaternary alloys were cast with the following nominal compositions in atomic percent (atomic %), namely, Al-0.06Zr-0.06Sc ("Alloy 1") (comparative example), Al-0.06Zr –0.05Sc–0.01Er (“Alloy 2”) and Al–0.06Zr–0.04Sc–0.02Er (“Alloy 3”). The compositions of alloys 1-3 in the as-cast state were measured by direct current plasma emission spectroscopy ("DCPMS") (ATI Wah Chang, Albany, OR) and 3D local electrode atom probe ("LEAP") tomography techniques, provided in Table 1 in. The silicon and iron contents of the alloy are less than the detection limit of 0.005 atomic % and 0.0025 atomic %, respectively, of the DCPMS technique.

[0058] Table 1

[0059]

[0060] The alloy was a low cast body of 99.999 atomic % pure Al (Alfa Aesar, Ward Hill, MA) and Al-0.9 atomic % Sc, Al-0.6 atomic % Zr and Al-1.15 atomic % Er master alloys. The Al–Sc and Al–Zr master alloys themselves were low-density ...

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Abstract

An aluminum alloy including additions of scandium, zirconium, erbium and, optionally, silicon.

Description

Background technique [0001] Cast iron and titanium alloys are currently the material of choice for certain high temperature applications such as automotive chassis and transmission components, automotive and aircraft engine components, aircraft engine structures, and airframe structural skins and frames. However, cast low aluminum-zirconium-scandium (Al–Zr–Sc) alloys in which scandium and zirconium are below their solubility limits are excellent substitutes for cast iron and titanium alloys in high temperature applications. [0002] Aluminum-zirconium-scandium alloys offer promising strength and creep resistance at temperatures in excess of 300°C. Aluminum-zirconium-scandium alloys can be produced economically using conventional casting and heat treatment. Coherent L12 ordered Al in supersaturated Al-Sc alloys with aging 3 Sc precipitates that provide significant strengthening relative to temperatures of about 300°C. Zirconium added to aluminum-scandium alloys to form anti-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/043C22C21/00C22C21/02C22F1/04
CPCC22C21/00B22D21/007C22C21/02C22F1/04C22F1/043
Inventor C·S·哈斯坎普C·布思-莫里森D·C·杜南D·N·塞德曼J·M·波劳B·加法里
Owner THE BOEING CO