Effect of Mn on the Nanoprecipitation in Binary Fe-Cu alloys

2011 ◽  
Vol 172-174 ◽  
pp. 297-302 ◽  
Author(s):  
Rajashekhara Shabadi ◽  
Roland Taillard ◽  
Bertrand Radiguet ◽  
Jérémie De Baerdemaeker ◽  
Elke Leunis
Keyword(s):  
Advanced Characterization ◽  
Positron Annihilation Spectroscopy ◽  
Atom Probe ◽  
Number Density ◽  
Homogenization Treatment ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Tomographic Atom Probe ◽  
Aging Kinetics ◽  
Kinetics Of

Effect of the third alloying element Mn on Cu-precipitation was studied in a binary Fe-1.3% Cu alloy. Precipitation in both the alloys was investigated after homogenization treatment and subsequent artificial aging. Advanced characterization techniques such as Positron Annihilation Spectroscopy (PAS) and Tomographic Atom Probe (TAP) were used to establish the chemical composition, morphology, size and number density of the Cu-rich phases. Combined results of PAS and TAP were particularly useful in order to follow the Cu precipitation in the binary alloy. At short aging times, addition of Mn significantly increased the kinetics of hardening while its effect on the magnitude of precipitation strengthening is only marginal. It further increases the over-aging kinetics.

The Dependence of the Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to HCL Solution on the 4Cr/ (2Mo+Cu)

2011 ◽  
Vol 194-196 ◽  
pp. 1920-1923
Author(s):  
Pan Li Hua ◽  
Rui Cheng Yang
Keyword(s):  
Corrosion Resistance ◽  
Kinetic Parameters ◽  
Empirical Formula ◽  
Corrosion Process ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Kinetics Of ◽  
Hcl Solution

The kinetics of corrosion process on five Ni—Cr—Mo—Cu alloys designed by the empirical formula APF=4Cr/ (2Mo+Cu) in HCl solution have been investigated at the concentration range from 0.002mol/cm3to 0.012 mol/cm3and 20°C. It is developed that the kinetic parameters and the dependence of the corrosion resistance on the APF have discussed.

Effect of Cu on Nanoscale Precipitation Evolution and Mechanical Properties of a Fe–NiAl Alloy

2017 ◽  
Vol 23 (2) ◽  
pp. 350-359 ◽  
Author(s):  
Qin Shen ◽  
Hao Chen ◽  
Wenqing Liu
Keyword(s):  
Mechanical Properties ◽  
Atom Probe Tomography ◽  
Diffusion Rate ◽  
Atom Probe ◽  
Peak Hardness ◽  
Dramatic Improvement ◽  
Number Density ◽  
Cu Alloy ◽  
Tension Tests ◽  
Nial Alloy

AbstractThe microstructural evolution of precipitation in two model alloys, Fe–NiAl and Fe–NiAl–Cu, was investigated during aging at 500°C for different times using atom probe tomography (APT). The APT results reveal that the addition of Cu effectively increases the number density of NiAl precipitates. This is attributed to Cu promoting the nucleation of NiAl particles by increasing the chemical driving force and decreasing the interfacial energy. The NiAl precipitates of the Fe–NiAl–Cu alloy grow and coarsen at a slower rate than that of the Fe–NiAl alloy, mainly due to the slower diffusion rate of the Cu atoms. The mechanical properties of the two alloys were characterized by Vickers hardness and tension tests. It was found that the addition of Cu results in the formation of core–shell precipitates with a Cu-rich core and a NiAl shell, leading to a dramatic improvement of peak hardness and strength. The effect of Cu on precipitation strengthening is discussed in terms of chemical strength and coherency strength.

Investigation of ordering kinetics in Cu3Au with the tomographic atom probe

1998 ◽  
Vol 13 (6) ◽  
pp. 1502-1510 ◽  
Author(s):  
S. Duval ◽  
S. Chambreland ◽  
A. Loiseau ◽  
D. Blavette
Keyword(s):  
Scaling Law ◽  
Three Dimensional ◽  
Atom Probe ◽  
Three Dimensions ◽  
Competitive Growth ◽  
Experimental Conditions ◽  
Ordering Kinetics ◽  
Tomographic Atom Probe ◽  
Kinetics Of ◽  
Dimensions Of Space

Kinetics of congruent ordering in Cu3Au at 350 °C was investigated by means of a three-dimensional atom probe. This instrument, called a Tomographic Atom Probe (TAP), enables atomic resolution images of a small volume (10 × 10 × 100 nm3) of the material reconstructed in the three dimensions of space. The time evolution of ordered domains at 350 °C shows that a t1/2 law is followed as soon as 5 min. For this aging time, the nucleus diameter is close to 1.7 nm. This scaling law was observed even before domains came into contact (t = 50 min). Competitive growth was observed to start as soon as 5 min. The number density was observed to decrease rapidly up to t = 50 min. A slower decrease was observed when domains begin to impinge. Experimental conditions and requirements as well as advantages of TAP as compared to HREM for the study of ordering are discussed in detail.

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.

The Dependence of the Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to H2SO4 Solution on the 4Cr/ (2Mo+Cu)

2011 ◽  
Vol 194-196 ◽  
pp. 1912-1915
Author(s):  
Li Hua Pan ◽  
Rui Cheng Yang
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Process ◽  
Cathodic Reaction ◽  
H2so4 Solution ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Analytical Expressions ◽  
Kinetics Of

The kinetics of corrosion process on Ni-Cr-Mo-Cu alloys designed by formula APF=4Cr/(2Mo+Cu) in H2SO4 solution have been investigated from the concentration of 0.002mol/cm3 to 0.012mol/cm3 at 20 . Analytical expressions for cathodic reaction were developed for the reduction of H+ and the reduction of oxygen. It is discussed that the corrosion resistance to H2SO4 solution depend on the APF in regular way.

The Dependence of Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to NaOH Solution on 4Cr/ (2Mo+Cu)

2011 ◽  
Vol 55-57 ◽  
pp. 374-377 ◽  
Author(s):  
Li Hua Pan ◽  
Rui Cheng Yang
Keyword(s):  
Corrosion Resistance ◽  
Kinetic Parameters ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Naoh Solution ◽  
Kinetics Of

The kinetics of the corrosion procession of Ni-Cr-Mo-Cu alloys designed by the formula APF=4Cr/ (2Mo+Cu) in NaOH solution have been investigated at the concentration range from 0.0025mol/cm3 to 0.015mol/cm3 and 20°C. It were developed that the kinetic parameters depend on the APF. It is discussed that the dependence of the corrosion resistance to NaOH solution on the APF.

HREM, FIM and tomographic atom probe investigation of Guinier–Preston zones in an Al–1.54at% Cu alloy

2004 ◽  
Vol 98 (2-4) ◽  
pp. 219-230 ◽  
Author(s):  
M. Karlı́k ◽  
A. Bigot ◽  
B. Jouffrey ◽  
P. Auger ◽  
S. Belliot
Keyword(s):  
Atom Probe ◽  
Cu Alloy ◽  
Tomographic Atom Probe ◽  
Probe Investigation

Plastic deformation of θ ' in Al-4%Cu alloy

1978 ◽  
Vol 36 (1) ◽  
pp. 576-577
Author(s):  
Shrikant P. Bhat
Keyword(s):  
Deformation Behavior ◽  
Room Temperature ◽  
Electron Microscopic Observation ◽  
Bulk Alloy ◽  
Electron Microscopic ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Orowan Mechanism ◽  
The Subject ◽  
Cyclic Straining

deformation behavior of Al-Cu alloys aged to contain θ ' has been the subject of many investigations (e.g., Ref. 1-5). Since θ ' is strong and hard, dislocations bypass θ ' plates (Orowan mechanism) at low strains. However, at high strains the partially coherent θ ' plates are probably sheared, although the mechanism is complex, depending on the form of deformation. Particularly, the cyclic straining of the bulk alloy is known to produce gross bends and twists of θ '. However, no detailed investigation of the deformation of θ ' has yet been reported; moreover, Calabrese and Laird interpreted the deformation of θ ' as largely being elastic.During an investigation of high temperature cyclic deformation, the detailed electron-microscopic observation revealed that, under reversed straining conditions, θ ' particles are severely distorted--bent and twisted depending on the local matrix constraint. A typical electronmicrograph, showing the twist is shown in Fig. 1. In order to establish whether the deformation is elastic or plastic, a sample from a specimen cycled at room temperature was heated inside the microscope and the results are presented in a series of micrographs (Fig. 2a-e).

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