Aging characteristics of electron beam and gas tungsten arc fusion zones of Al-Cu-Li alloy 2090

Journal Article · Sun Mar 31 23:00:00 EST 1991 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02659000· OSTI ID:7244375

Sunwoo, A J ^[1]; Morris, Jr, J W ^[2]

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1. Lawrence Berkeley Lab., CA (United States). Center for Advanced Materials
2. Univ. of California, Berkeley, CA (United States). Dept of Materials Science and Engineering

A transmission electron microscopy (TEM) investigation of the electron beam (EB) and gas tungsten arc (GTA) fusion zones of 2090 indicates that in both the as-welded and aged conditions, the EB and GTA fusion zones lack the volume fraction and the homogeneity of strengthening precipitates found in the base metal. In the underaged and peak-aged conditions, the [delta][prime] phase is the primary strengthener, the volume fraction of T[sub 1] present being too low to be effective. The T[sub 1] precipitates are found either in the vicinity of other inclusions or at the dendrite boundaries. As the strength increases with postweld aging, the elongation decreased to 1%. The presence of the boundary phases and Cu- and Cl-containing inclusions at the boundaries leads to poor elongation. The joint efficiencies of the peak-aged EB and GTA weldments (EBWs and GTAWs, respectively) are 75 and 55% at 293 K and 75 and 50% at 77 K, respectively. Both EBWs and GTAWs have relatively low elongations.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7244375
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 22; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
AGING
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
ARC WELDING
COPPER ALLOYS
DATA
ELECTRON BEAM WELDING
EXPERIMENTAL DATA
FABRICATION
GAS METAL-ARC WELDING
GAS TUNGSTEN-ARC WELDING
HARDENING
HEAT AFFECTED ZONE
INFORMATION
JOINING
JOINTS
LITHIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUMERICAL DATA
PRECIPITATION
PRECIPITATION HARDENING
SEPARATION PROCESSES
WELDED JOINTS
WELDING
ZONES