A STUDY OF G.P. ZONES IN Al-Cu ALLOYS BY ATOM-PROBE FIM

1986 ◽  
Vol 47 (C2) ◽  
pp. C2-171-C2-177 ◽  
Author(s):  
T. HASHIZUME ◽  
K. HONO ◽  
Y. HASEGAWA ◽  
K. HIRANO ◽  
T. SAKURAI
Keyword(s):  
Atom Probe ◽  
Cu Alloys

Evolution of Nanostructure during the Early Stages of Ageing in Al-Zn-Mg-Cu Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 555-560 ◽  
Author(s):  
Peter V. Liddicoat ◽  
Tomoyuki Honma ◽  
L.T. Stephenson ◽  
Simon P. Ringer
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Age Hardening ◽  
Peak Hardness ◽  
Cu Alloys ◽  
Transmission Electron ◽  
Element Species ◽  
Hardness Increase ◽  
Solute Interactions ◽  
Effect Of Copper

During age-hardening of certain Al-Zn-Mg-Cu alloys, a 90% hardness increase can occur with 75 seconds. The clustering and precipitation of solute element species during this early rapid hardening (RH) period has been investigated through atom probe tomography, transmission electron microscopy, and Vickers hardness measurements. This study has focussed on the effect of copper by analysing three alloys; Al-2.0Zn-1.8Mg-0.7Cu, Al-2.0Zn-1.7Mg-0.2Cu and Al-1.9Zn-1.7Mg (at.%). The early RH reaction in these alloys accounts for up to 70% of the total hardening (peak hardness minus as-quenched hardness) and takes place during the first 60 seconds of ageing. We report preferred solute-solute interactions in the as-quenched materials. This quenched-in nanostructure acts as a template for subsequent solute clustering, the nature of which we have correlated with ageing.

Analysis of atomic distribution near grain boundary in Zr Sn Nb Fe-(Cu) alloys by atom probe tomography

2019 ◽  
Vol 515 ◽  
pp. 135-139
Author(s):  
Boran Tao ◽  
Baifeng Luan ◽  
Risheng Qiu ◽  
Qiang Fang ◽  
Lingfei Cao ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Cu Alloys ◽  
Atomic Distribution

ATOM-PROBE STUDY OF SURFACE SEGREGATION OF Ni-Cu ALLOYS

1986 ◽  
Vol 47 (C2) ◽  
pp. C2-381-C2-387
Author(s):  
T. HASHIZUME ◽  
T. SAKURAI ◽  
H. W. PICKERING
Keyword(s):  
Surface Segregation ◽  
Atom Probe ◽  
Cu Alloys

Quantitative Correlation between Strength, Ductility and Precipitate Microstructures with PFZ in Al-Zn-Mg(-Ag, Cu) Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 431-436 ◽  
Author(s):  
Tomo Ogura ◽  
Shoichi Hirosawa ◽  
Alfred Cerezo ◽  
Tatsuo Sato
Keyword(s):  
Electron Microscopy ◽  
Grain Boundary ◽  
Three Dimensional ◽  
Atom Probe ◽  
The Other ◽  
Proof Stress ◽  
Quantitative Correlation ◽  
Cu Alloys ◽  
Transmission Electron ◽  
Initial Stage

The quantitative correlation between strength, ductility and precipitate microstructures in the vicinity of grain boundaries with precipitate free zones (PFZ) was evaluated for Al-Zn-Mg(-Ag, Cu) alloys using transmission electron microscopy (TEM), three-dimensional atom probe (3DAP) and tensile test. In the Al-Zn-Mg ternary and Cu-added alloys aged at 433K, larger widths of PFZ were observed by TEM and resulted in lower elongations to fracture, independent of the size of grain boundary precipitates. On the other hand, the elongation of the Ag-added alloy was higher, if compared at the same levels of proof stress, due to the much smaller width of PFZ. This strongly suggests that PFZ is harmful to fracture of the investigated alloys. From a 3DAP analysis, furthermore, it was revealed that Ag and Cu atoms are incorporated in the nanoclusters from the initial stage of aging. In this work, the elongation was well correlated to the width of PFZ, size of grain boundary precipitates and the level of proof stress, enabling to predict ductility of the alloys from known microstructural factors.

Effects of the Copper Addition on the Precipitation of Al-Mg-Si Alloys

2011 ◽  
Vol 189-193 ◽  
pp. 4325-4329
Author(s):  
Li Li Yang ◽  
Man Jin ◽  
Chao Feng Xia
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Three Dimensional ◽  
Atom Probe ◽  
Heating Process ◽  
Copper Addition ◽  
Cu Alloys ◽  
Transmission Electron

The effect of the copper additions on the heating process and the microstructure of 6082Al-Mg-Si alloys was investigated. The results show that there are four exothermic peaks from 50°C to 450°C in the Al-Mg-Si-0.6%Cu alloys, and the center temperature of every peak is lower than the temperature in the Al-Mg-Si alloys. Based on the observation of transmission electron microscope and three-dimensional atom probe, it is found that the copper reduce the precipitated time and the precipitated temperature of the precipitates. The number of the precipitates in the Al-Mg-Si-0.6%Cu alloys increased.

Clustering and Segregation of Ag and Mg Atoms in the Nucleation and Growth Stage of Ω And T1 Precipitates In Al-Cu(-Li) Alloys

1998 ◽  
Vol 4 (S2) ◽  
pp. 116-117
Author(s):  
M. Murayama ◽  
L. Reich ◽  
K. Hono
Keyword(s):  
Growth Stage ◽  
Atom Probe ◽  
Nucleation And Growth ◽  
Phase 2 ◽  
Alloy Plate ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Ω Phase ◽  
Uniform Dispersion ◽  
T Phase

Trace additions of Ag and Mg in Al-Cu and Al-Li-Cu alloys change the precipitation processes drastically. In Al-Cu-Mg-Ag alloy, plate-like Ω phase precipitates on the {111} matrix planes. Similarly, additions of Ag and Mg to Al-Li-Cu alloy cause uniform dispersion of the T1 precipitate on the {111} matrix planes. Ω and T1 phases are structurally and morphologically similar, and a similar mechanism is expected to work in both alloy systems to enhance uniform dispersion of the plate-like precipitates on the {111} planes. A previous atom probe work [1] reported that Ag and Mg are segregated at the αΩ. interfaces in an Al-Cu-Mg-Ag alloy. In an Al-Li-Cu-Mg-Ag alloy, Ag and Mg atoms were found to be incorporated with the T, phase [2]; however, because of the thinness of the T1, plate, the exact location of these atoms with respect to the T1, phase could not be determined sucessfully by a conventional atom probe.

scholarly journals ATOM-PROBE STUDY OF G.P. ZONES IN Ti-Cu ALLOYS

1986 ◽  
Vol 47 (C7) ◽  
pp. C7-281-C7-286 ◽  
Author(s):  
L. HADJADJ ◽  
A. MENAND ◽  
D. BLAVETTE
Keyword(s):  
Atom Probe ◽  
Cu Alloys
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