The early stages of GP zone formation in naturally aged Ai-4 wt pct cu alloys

1977 ◽  
Vol 8 (8) ◽  
pp. 1257-1261 ◽  
Author(s):  
R. J. Rioja ◽  
D. E. LAughlin
Keyword(s):  
Zone Formation ◽  
Early Stages ◽  
Cu Alloys

A neutron scattering investigation of the early stages of guinier-preston zone formation in AlZnMg(Cu)-alloys

1982 ◽  
Vol 30 (2) ◽  
pp. 547-552 ◽  
Author(s):  
O. Blaschko ◽  
G. Ernst ◽  
P. Fratzl ◽  
M. Bernole ◽  
P. Auger
Keyword(s):  
Neutron Scattering ◽  
Zone Formation ◽  
Early Stages ◽  
Cu Alloys ◽  
Guinier Preston Zone

Precipitation in Al-Li-Cu Alloys

1981 ◽  
Vol 39 ◽  
pp. 44-45
Author(s):  
J. E. O'Neal ◽  
K. K. Sankaran
Keyword(s):  
Electron Microscopy ◽  
Age Hardening ◽  
Precipitation Behavior ◽  
Zone Formation ◽  
Specific Strength ◽  
Hardening Behavior ◽  
Cu Alloys ◽  
High Specific Strength ◽  
Transmission Electron ◽  
Structural Applications

Al-Li-Cu alloys combine high specific strength and high specific modulus and are potential candidates for aircraft structural applications. As part of an effort to optimize Al-Li-Cu alloys for specific applications, precipitation in these alloys was studied for a range of compositions, and the mechanical behavior was correlated with the microstructures.Alloys with nominal compositions of Al-4Cu-2Li-0.2Zr, Al-2.5Cu-2.5Li-0.2Zr, and Al-l.5Cu-2.5Li-0.5Mn were argon-atomized into powder at solidification rates ≈ 103°C/s. Powders were consolidated into bar stock by vacuum pressing and extruding at 400°C. Alloy specimens were solution annealed at 530°C and aged at temperatures up to 250°C, and the resultant precipitation was studied by transmission electron microscopy (TEM).The low-temperature (≲100°C) precipitation behavior of the Al-4Cu-2Li-0.2Zr alloy is a combination of the separate precipitation behaviors of Al-Cu and Al-Li alloys. The age-hardening behavior at these temperatures is characteristic of Guinier-Preston (GP) zone formation, with additional strengthening resulting from the coherent precipitation of δ’ (Al3Li, Ll2 structure), the presence of which is revealed by the selected-area diffraction pattern (SADP) shown in Figure la.

Combined Use of Small Angle Neutron Scattering (Sans) and (Conventional and High Resolution) Electron Microscopy for the Characterization of Early Stages of Ordering and Phase Separation in Ni-Ti

1986 ◽  
Vol 82 ◽  
Author(s):  
A. Cerri ◽  
R. Schmelczer ◽  
P. Schwander ◽  
G. Kostorz ◽  
A.F. Wright
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Tem Analysis ◽  
Zone Formation ◽  
Early Stages ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Combined Use ◽  
Integrated Intensity

ABSTRACTThe decomposition of Ni ∼ 11.5 at.% Ti single crystals was studied for an ageing temperature of 540°C. In this alloy, coherent ordered zones of γ′-Ni3Ti (Cu3Au structure) are formed prior to the stable n precipitates. The early stages of zone formation were investigated by in-beam SANS and transmission electron microscopy (TEM). Electron diffraction, high resolution electron microscopy, TEM analysis of dislocation arrangements in samples deformed after ageing and X-ray measurements of the integrated intensity at L12 superstructure positions show that ordered regions already appear in quenched samples, whereas compositional changes, as determined by SANS measurements, occur only upon ageing.

Early stages of nucleation and growth of Guinier–Preston zones in Al–Zn–Mg and Al–Zn–Mg–Cu alloys

2006 ◽  
Vol 97 (3) ◽  
pp. 315-320 ◽  
Author(s):  
Péter Kenesei ◽  
Győző Horváth ◽  
Sigrid Bernstorff ◽  
Tamás Ungár ◽  
János Lendvai
Keyword(s):  
Nucleation And Growth ◽  
Early Stages ◽  
Cu Alloys

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

2006 ◽  
pp. 555-560
Author(s):  
P.V. Liddicoat ◽  
Tomoyuki Honma ◽  
L.T. Stephenson ◽  
Simon P. Ringer
Keyword(s):  
Early Stages ◽  
Cu Alloys

The evolution of magnetostriction and coercivity with temperature in the early stages of nanocrystallisation in FeCoNbB(Cu) alloys

2002 ◽  
Vol 250 ◽  
pp. 260-266 ◽  
Author(s):  
J.S Blázquez ◽  
V Franco ◽  
A Conde ◽  
M.R.J Gibbs ◽  
H.A Davies ◽  
...  
Keyword(s):  
Early Stages ◽  
Cu Alloys
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