Tension characteristics of notched specimens for Al-Li-Cu-Zr alloy sheets with various cerium contents

Journal Article · Tue Oct 01 00:00:00 EDT 1996 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/BF02663858· OSTI ID:417866

Meng, L; Zheng, X L ^[1]

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1. Northwestern Polytechnical Univ., Xi`an (China). Dept. of Materials Science and Engineering

In the present article, the high strength Al-Li-Cu-Zr alloy sheets modified by a rare earth element, Ce, are considered for possible application in practical aircraft products containing structural notches or stress concentrations; accordingly, a study has been made on the effects of stress concentration levels and Ce contents on the tension strength of notched specimens for the alloy sheets. Moreover, a discussion has been set off on the theoretical predictability on the basis of a theoretical expression for the notch strength by means of the mechanical properties of the smooth specimens. The test results show that when the stress concentration level increases, the notch strength linearly decreased in the double logarithmic coordinate; by comparison with the Ce-free alloy, the Ce-containing alloy sheets exhibits an insignificantly varying notch strength when the Ce content changes from 0.13 to 0.31 wt pct in the transverse orientation specimens or is 0.21 wt pct in the longitudinal orientation specimens even though their ductility for the smooth specimens can be improved to a certain degree by the Ce modification. The test data of notched specimens under the theoretical stress concentration factor (K{sub t}) from 2.0 to 8.0 agree better with the predicted values of notch strength. Therefore, in accordance with some engineering properties such as the ultimate tensile strength (UTS), percentage elongation (EL), and Young`s modulus (E) of the smooth specimens, the notch strength of the alloy sheets under plane strain state can be easily estimated in a certain range of stress concentration levels.

• Sponsoring Organization: USDOE
• OSTI ID: 417866
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 10 Vol. 27; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AIRCRAFT COMPONENTS
ALUMINIUM BASE ALLOYS
CASTING
CERIUM
CHEMICAL COMPOSITION
COPPER ALLOYS
ELONGATION
FORGING
LITHIUM ALLOYS
METALLURGICAL EFFECTS
NOTCHES
PREDICTION EQUATIONS
ROLLING
SAMPLE PREPARATION
STRESSES
TENSILE PROPERTIES
ULTIMATE STRENGTH
WEIGHT
YOUNG MODULUS
ZIRCONIUM ALLOYS