Effect of superimposed oscillations on creep behaviour of Al – 2 4·.5Cu and Al – 2 4·5Cu – 2 0·1In (wt-%) alloys containing θ′ precipitates

Abstract The behaviour of both transient and steady state creep of Al – 4·5Cu and Al – 4·5Cu – 0·1In (wt-%) alloys was investigated using a constant stress where torsional oscillations of different frequencies and shear strain amplitudes were operated at various working temperatures. An augment in both transient and steady state creep rates was observed by increasing both frequency and shear strain amplitude of the applied oscillations. The mean values of the activation energy of both alloys for both creep stages were found to be equal to that quoted for dislocation intersection mechanism.

[1]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[2]  M. Mahmoud,et al.  Plastic deformation of Al–4.5 wt% Cu and Al–4.5 wt% Cu–0.1 wt% In alloys under the effect of cyclic stress reduction , 2004 .

[3]  M. Mahmoud,et al.  Effect of superimposed oscillations on the creep characteristics of Al-22 wt%Ag alloy , 2002 .

[4]  Woei-Shyan Lee,et al.  Effect of strain rate on impact response and dislocation substructure of 6061-T6 aluminum alloy , 1999 .

[5]  J. Knott,et al.  Fatigue performance of a cast aluminium alloy Al-7Si-Mg with surface defects , 1999 .

[6]  G. S. Al-Ganainy,et al.  Effect of Temperature and Stress on the Structure and Creep Parameters of Pb—2 at% Sb Alloy , 1998 .

[7]  B. Jouffrey,et al.  High resolution electron microscopy study of Guinier-Preston (GP1) zones in AlCu based alloys , 1997 .

[8]  J. Dankovicová.  Czech , 1997, Journal of the International Phonetic Association.

[9]  M. Kenawy,et al.  Effect of Superimposed Low Frequency Oscillations on the Static Creep Behaviour of Al–1 wt% Si and Al–1 wt% Si–0.1 wt% Zr–0.1 wt% Ti Alloys , 1997 .

[10]  M. Kenawy,et al.  Effect of Structure Transformation on Transient Creep Behavior of AlAg System , 1996 .

[11]  G. S. Al-Ganainy,et al.  Effect of Phase Transformation on Creep Characteristics of Sn—5 wt% Bi Alloy , 1996 .

[12]  H. Zayed,et al.  Transient and steady state creep of Al-4.5 wt% Mg during phase transformation , 1990 .

[13]  M. I. Dessouky,et al.  A Modified Adaptive PCA Learning based Method for Image Denoising , 2013 .

[14]  C. Laird,et al.  Cyclic creep acceleration and retardation in polycrystalline copper tested at ambient temperature , 1984 .

[15]  E. Matsubara,et al.  Local atomic arrangements in the solid solution Al-1.7 at.% Cu, at 793 K , 1983 .

[16]  T. Sato,et al.  Structure of G.P. Zones in an Al-1.7at.%Cu alloy aged for 14 years at room temperature , 1983 .

[17]  M. Nagy,et al.  Anomalous behaviour of transient creep in commercially pure aluminium , 1981 .

[18]  C. Laird,et al.  Kinetics of growth of platelike precipitates , 1974 .

[19]  C. W. Chen,et al.  EVIDENCE FOR IMPURITY BANDS IN La-DOPED EuS , 1964 .

[20]  H. Kimura,et al.  Interaction of vacancies with Sn atoms and the rate of G-P zone formation in an AlCuSn alloy , 1961 .