A superplastic Al-Li-Cu-Mg-Zr powder alloy with high hardness and modulus
Structure/property studies were made on an experimental Al-3.18% Li-4.29% Cu-1.17% Mg-0.18% Zr powder alloy, which is of the low density/high modulus type. Alloy powder was made by the P and W/GPD rapid solidification rate (RSR) process, canned, and extruded to bar. The density was 2.458 x 10/sup 6/ g/m/sup 3/. The material was solution-treated, and aged at 149/sup 0/C(300/sup 0/F), 171/sup 0/C(340/sup 0/F), and 193/sup 0/C(380/sup 0/F), using hardness tests to determine the aging curves. Testpieces solution-treated at 516/sup 0/C(961/sup 0/F) showed an average yield strength (0.2% offset) of 43.3 ksi (299 MPa) and ultimate tensile strength of 50.0 ksi (345 MPa), with 1% elongation, which increased to 73.0 ksi (503 MPa) and 73.1 ksi (504 MPa), respectively, with only 0.2% elongation, on peak aging at 193/sup 0/C(380/sup 0/F), with a modulus of elasticity of 11.4 x 10/sup 6/ psi (78.3 GPa). Hardness values reached 90-92 R/sub B/ on aging at 149-193/sup 0/C(300-380/sup 0/F). The as-extruded alloy showed superplastic behavior at 400-500/sup 0/C(752-932/sup 0/F) with elongations of 80-185% on 25.6 mm, peaking at 450/sup 0/C(842/sup 0/F). An RSR Al-2.53% Li-2.82% Mn-0.02% Zr extruded allow showed only 18-23% elongation at 400-500/sup 0/C(752-932/sup 0/F).
- Research Organization:
- Materials Technology Dept., United Technologies Research Center, East Hartford, CT 06108
- OSTI ID:
- 5284676
- Journal Information:
- Metallography; (United States), Journal Name: Metallography; (United States) Vol. 19:3; ISSN MEIJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
AGING
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
COPPER ALLOYS
DENSITY
DISSOLUTION
ELASTICITY
ELONGATION
EXTRUSION
FABRICATION
HARDNESS
HIGH TEMPERATURE
LITHIUM ALLOYS
MAGNESIUM ALLOYS
MATERIALS WORKING
MECHANICAL PROPERTIES
METALLURGY
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLASTICITY
POWDER METALLURGY
POWDERS
SOLIDIFICATION
TENSILE PROPERTIES
ULTIMATE STRENGTH
VERY HIGH PRESSURE
YIELD STRENGTH
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS