scholarly journals Experimental Investigation of the Early Stage of Precipitation on Binary Al-Li, Al-Cu Alloys and Ternary Al-Li-Cu Alloys by Means of Atom Probe Tomography

2016 ◽  
Vol 06 (02) ◽  
pp. 25-44 ◽  
Author(s):  
Muna Khushaim ◽  
Torben Boll
Keyword(s):  
Experimental Investigation ◽  
Atom Probe Tomography ◽  
Early Stage ◽  
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

Slow Bainite: an Opportunity to Determine the Carbon Content of the Bainitic Ferrite during Growth

2011 ◽  
Vol 172-174 ◽  
pp. 111-116 ◽  
Author(s):  
Francisca García Caballero ◽  
Michael K. Miller ◽  
Carlos García-Mateo
Keyword(s):  
Solid Solution ◽  
Carbon Content ◽  
Atom Probe Tomography ◽  
Early Stage ◽  
Bainitic Ferrite ◽  
Atom Probe ◽  
Transformation Kinetics ◽  
Bainite Transformation ◽  
Parent Austenite ◽  
Kinetics Of

The amount of carbon in solid solution in bainitic ferrite at the early stage of transformation has been directly determined by atom probe tomography at 200 °C, taking advantage of the extremely slow transformation kinetics of a novel nanocrystalline steel. Results demonstrated that the original bainitic ferrite retains much of the carbon content of the parent austenite providing strong evidence that bainite transformation is essentially displacive in nature.

Atom probe tomography of early stage clustering in Al alloys

2016 ◽  
pp. 187-188
Author(s):  
Stefan Pogatscher ◽  
Phillip Dumitraschkewitz ◽  
Stephan S.A. Gerstl
Keyword(s):  
Atom Probe Tomography ◽  
Early Stage ◽  
Atom Probe ◽  
Al Alloys

Atomic Scale Investigation of Cr Precipitation in Cu and Related Mechanical Properties.

2011 ◽  
Vol 172-174 ◽  
pp. 291-296
Author(s):  
Abdelahad Chbihi ◽  
Xavier Sauvage ◽  
Didier Blavette
Keyword(s):  
Mechanical Properties ◽  
Phase Diagram ◽  
Atom Probe Tomography ◽  
Quantitative Data ◽  
Volume Fraction ◽  
Early Stage ◽  
Atom Probe ◽  
Atomic Scale ◽  
Precipitation Sequence ◽  
The Relationship

The early stages of precipitation of Cr rich precipitates were investigated by Atom Probe Tomography (APT) in a Cu-1Cr-0.1Zr (wt.%). This way, quantitative data were obtained about their size, 3D shape, density, composition and volume fraction. Surprisingly, in the early stage of precipitation, nanoscaled precipitates exhibit various shapes (spherical, plates and ellipsoid) and contain a large amount of Cu (up to 50%), in contradiction with the equilibrium Cu-Cr phase diagram. APT data also show that some impurities (Fe) segregate along Cu/Cr interfaces. A precipitation sequence is proposed and the relationship between mechanical properties and microstructure is discussed.

scholarly journals Atom Probe Tomography Investigations of Modified Early Stage Clustering in Si-Containing Aluminum Alloys

2015 ◽  
Vol 128 (4) ◽  
pp. 643-647 ◽  
Author(s):  
S. Pogatscher ◽  
S.S.A. Gerstl ◽  
J.F. Löffler ◽  
P.J. Uggowitzer
Keyword(s):  
Aluminum Alloys ◽  
Atom Probe Tomography ◽  
Early Stage ◽  
Atom Probe

Effect of Pre-Ageing on the Artificial Ageing Response of Al-Mg-Si(-Cu) Alloys

2010 ◽  
Vol 654-656 ◽  
pp. 918-921 ◽  
Author(s):  
Ling Fei Cao ◽  
Paul A. Rometsch ◽  
Hao Zhong ◽  
Barry C. Muddle
Keyword(s):  
Early Stage ◽  
Solution Treatment ◽  
Atom Probe ◽  
Artificial Ageing ◽  
Natural Ageing ◽  
Scanning Calorimetry ◽  
Short Delay ◽  
3 Dimensional ◽  
Cu Alloys ◽  
Short Time

The effect of different pre-ageing treatments on the subsequent artificial ageing response of Al-Mg-Si(-Cu) alloys have been investigated using hardness, tensile and electrical conductivity testing. The microstructural evolution was characterised by differential scanning calorimetry (DSC) and 3-dimensional atom probe (3DAP) analysis. Pre-ageing treatments were carried out at 160-250°C for short times. Results show that the early stage artificial ageing response after 30 minutes at 170°C is strongly influenced by the pre-ageing and natural ageing conditions. A pre-ageing treatment performed for a short time at a high temperature and within a short delay after solution treatment and quenching was found to give a promising hardening response during subsequent artificial ageing. The mechanisms by which pre-ageing can reduce the detrimental effect of natural ageing on the artificial ageing response will be discussed in relation to the formation and distribution of clusters, GP zones and/or precipitates.

Sign in / Sign up

Export Citation Format

Share Document