Copper Concentration inside Guinier-Preston I Zones Formed in an Al–Cu Alloy

On the nature of Guinier-Preston zones in meteoritic and lunar orthopyroxene

Introduction: Upon cooling in their host rocks, orthopyroxenes undergo cation ordering and exsolution processes. The state of order achieved during cooling [1] and the type and morphology of the exsolution products depend on the rate of cooling. Often, the formation of stable exsolution phases is preceded by the formation of metastable phases, e.g. Guinier-Preston (GP) zones. GP zones consist o...

Characterization of Guinier-Preston Zones by High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy

Age-hardened alloys are everywhere: in aeroplanes, aluminum sashes, electrical connections for computer devices, and so on. The materials that have made possible the very existence of these human inventions are manufactured based on a single materials-science principle known as ageing. Here, supersaturated impurity atoms that dissolved in an otherwise pure metal gather around inside the metal a...

Vacancy-interstitial pairs in ordered smectic phases : a linear Guinier-Preston zone behaviour

An original diffuse X-ray scattering pattern is observed for single domains of threedimensionally ordered Smectic B and G phases : a fairly sharp white line going through the center of the reciprocal space is associated with a periodic set of parallel and equidistant black lines of similar shape. It is demonstrated that this set of lines is the signature of a linear defect consisting in a local...

CONCENTRATION VARIATIONS OF MAJOR AND MINOR ELEMENTS ACROSS VARIOUS ALTERATION ZONES IN PORPHYRY COPPER DEPOSIT AT SUNGUN, EAST AZARBAIDJAN, IRAN

Stable Stacking Faults Bounded by Frank Partial Dislocations in Al7075 Formed through Precipitate and Dislocation Interactions

Through high-resolution electron microscopy, stacking faults (SFs) due to Frank partial dislocations were found in an aluminum alloy following deformation with low strain and strain rate, while also remaining stable during artificial aging. Extrinsic stacking faults were found surrounded by dislocation areas and precipitates. An intrinsic stacking fault was found between two Guinier-Preston II ...