Atomic scale studies of the chemistry of the Cu/MgO l brace 111 r brace heterophase interface

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:5072360

Jang, H; Seidman, D N ^[1]; Merkle, K L ^[2]

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1. Northwestern Univ., Evanston, IL (United States)
2. Argonne National Lab., IL (United States)

The Cu/MgO (111) heterophase interface is studied using a combination of transmission electron microscopy, high resolution electron microscopy and atom-probe field-ion microscopy techniques. Wire and foil specimens of a Cu-2.8 at.% Mg alloy were internally oxidized to produce MgO precipitates at a number density of 5{center dot}10{sup 15}Cm{sup {minus}3} with a mean diameter of {approx}200 {Angstrom}. The MgO precipitates have a semicoherent interface with the Cu matrix and they exhibit a cube-on-cube orientation relationship. The octahedral-shaped MgO precipitates were analyzed using APFIM by dissecting along a <111> direction on an atomic scale. In this manner an MgO precipitate, with a (111) plane perpendicular to the axis of the APFIM, is uncovered after the Cu matrix has been mass analyzed. It was found that the terminating (222) plane of an MgO precipitate is pure oxygen, and the second (222) plane is pure Mg.

• Research Organization: Argonne National Lab., IL (United States); Northwestern Univ., Evanston, IL (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38; FG02-89ER45403
• OSTI ID: 5072360
• Report Number(s): ANL/CP-75559; CONF-920760-2; ON: DE92017065
• Resource Relation: Conference: International symposium on symbolic and algebraic computation, Berkeley, CA (United States), 27-29 Jul 1992
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER
INTERFACES
MAGNESIUM OXIDES
ION MICROSCOPY
OXIDATION
PRECIPITATION HARDENING
TRANSMISSION ELECTRON MICROSCOPY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRON MICROSCOPY
ELEMENTS
HARDENING
MAGNESIUM COMPOUNDS
METALS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENTS
360102* - Metals &amp; Alloys- Structure &amp; Phase Studies
360202 - Ceramics
Cermets
&amp; Refractories- Structure &amp; Phase Studies