On the occurrence of Portevin-Le Chatelier effect in fusion welded 2091 Al-Li based alloy joints

Journal Article · Fri Sep 01 00:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00233-L· OSTI ID:105941

Vidal, A C; Darwish, F A; Solorzano, I G ^[1]

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1. Catholic Univ., Rio de Janeiro (Brazil)

Al-Li based alloys are characterized by their lower density and higher stiffness, in comparison with conventional aluminum alloys. This makes the former very attractive for replacing the latter in structural and cryogenic applications, particularly in aeronautic and aerospace industries. The potential use of lithium-bearing also has stimulated studies on the weldability of these alloys as well as on the mechanical properties of the resulting welded joints. Al-Li-Cu-Mg alloy systems studied by Gomiero were found to exhibit serrations in their stress-strain curves, indicating the occurrence of Portevin-Le Chatelier (PLC) effects during plastic flow in these systems. The present study was therefore undertaken to determine the effect of fusion welding on the uniaxial tensile behavior of a 2091 (Al-Li-Cu-Mg-Zr) alloy. Microstructural aspects pertinent to the PLC effect are to be emphasized and the influence of post-weld heat treatment is to be presented and discussed.

• OSTI ID: 105941
• Journal Information: Scripta Metallurgica et Materialia, Vol. 33, Issue 5; Other Information: PBD: 1 Sep 1995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
WELDED JOINTS
LITHIUM ALLOYS
COPPER ALLOYS
MAGNESIUM ALLOYS
TENSILE PROPERTIES
PORTEVIN-LE CHATELIER EFFECT
SAMPLE PREPARATION
X-RAY RADIOGRAPHY
HEAT TREATMENTS
GRAIN BOUNDARIES
SEGREGATION