Effect of yttrium on cryogenic mechanical properties and fracture behavior of Al-Li-Cu-Mg-Zr alloy

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Advances in Cryogenic Engineering

OSTI ID:476715

Ma, L M; Liang, G J; Li, Y Y ^[1]

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1. Institute for Metal Research, Shenyang (China); and others

The effect of various contents (0.07 and 0.23 Wt-%) of rare earth (RE) element yttrium on cryogenic mechanical properties and fracture behavior of an Al-Li-Cu-Mg-Zr alloy has been studied at temperatures from 295 to 4 K. Y increased the yield strength, ultimate tensile strength, elongation, and notched tensile strength of the alloy at ambient and cryogenic temperatures. However, Y had less effect on the notch sensitivity and fracture toughness of the alloy. The better properties of the alloy can be obtained by addition of 0.23%Y. At peak-aged condition and cryogenic temperatures, the alloy (without Y) showed mixed fracture mode, the starting-fracture zone showed a cleavage-like fracture. Y addition improved the fracture resistance of the alloy, turned the mixed fracture mode into transgranular ductile fracture, and made the cleavage-like fracture in starting-fracture zone disappeared. The reasons of the improvements of properties and fracture resistance are attributed to the finer grains and S (Al{sub 2}CuMg) phase homogeneous distribution induced by Y addition.

• OSTI ID: 476715
• Report Number(s): CONF-950722--
• Journal Information: Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42A; ISSN 0065-2482; ISSN ACYEAC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ALUMINIUM BASE ALLOYS
COPPER ALLOYS
FRACTURE PROPERTIES
LITHIUM ALLOYS
MAGNESIUM ALLOYS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TENSILE PROPERTIES
YTTRIUM ALLOYS
ZIRCONIUM BASE ALLOYS