Journal Article10.1016/J.MSEA.2011.09.115
Creep characteristics and microstructure in nano-particle strengthened AA6082
Mahmoud T. Abdu,Mahmoud S. Soliman,Ehab A. El-Danaf,Abdulhakim A. Almajid,Farghalli A. Mohamed +4 more
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TL;DR: In this article, the authors investigated the creep characteristics of nano-particle strengthened AA6082 (Al-Mg-Si) alloy via precipitation hardening over five orders of magnitude of strain rates.
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Abstract: Creep characteristics of nano-particle strengthened AA6082 (Al–Mg–Si) alloy via precipitation hardening were investigated over five orders of magnitude of strain rates. The experimental data showed that the apparent creep behavior of AA6082 differed from that of pure Al with regard to two primary features: the apparent stress exponent, n a , is about 7 and the apparent activation energy for creep (206 kJ/mol) is higher than that for self-diffusion (142 kJ/mol). An examination of the data revealed a threshold stress whose temperature dependence is much stronger than that attributable to the shear modulus. Evidence based on transmission electron microscopy (TEM) investigation indicated that the origin of the threshold stresses was related to the interaction of dislocations with second phase particles, which were identified as Mg 2 Si. By incorporating the threshold stress into creep analysis, it was demonstrated that the true creep behavior of AA6068 was consistent with that ascribable to high-temperature climb and that the alloy was more creep resistant than Al.
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Citations
Stress relaxation behavior of an Al–Zn–Mg–Cu alloy in simulated age-forming process
TL;DR: In this paper, the stress relaxation behavior of age-forming for an Al-Zn-Mg-Cu alloy was studied using a designed device that can simulate the age forming process.
78
Creep Behavior of ZK60 Alloy and ZK60/SiC w Composite After Extrusion and Precipitation Hardening
TL;DR: In this article, the authors investigated the creep properties of ZK60 alloy and ZK 60/SiCw composite after extrusion and precipitation hardening by accelerated creep test and found that the creep mechanism changed by increasing the stress from grain boundary sliding (GBS) to dislocation creep due to the fact that the average true creep activation energy changed from 55 to 95.
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Hot Deformation of AA6082 Containing Fine Intermetallic Particles
TL;DR: In this article, the authors used light optical and scanning electron microscopy to study the as-received microstructure of AA6082 aluminum alloy, which consisted of elongated, partially recrystallized grains containing fine Mg2Si and AlFeMnSi particles.
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Effect of tensile strain rate on high-temperature deformation and fracture of rolled Al-15 vol% B4C composite
Mahmoud S. Soliman,Magdy M. El Rayes,Adel T. Abbas,Danil Yu. Pimenov,Ivan Nikolaevich Erdakov,Harri Junaedi +5 more
TL;DR: In this article, the deformation behavior of a rolled Al-15vol% B4C composite was studied at high temperatures, using single tensile tests over a wide range of strain rates.
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Dry Sliding Tribological Properties of a Hard Anodized AA6082 Aluminum Alloy
Eleonora Santecchia,Marcello Cabibbo,Abdel Magid Hamouda,Farayi Musharavati,Anton Popelka,Stefano Spigarelli +5 more
- 01 Feb 2020
TL;DR: In this paper, the surface and structure characterization of AA6082 were performed before and after the tribological tests, using a wide range of techniques; atomic force microscopy and scanning electron microscopy techniques were used before the wear tests.
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TL;DR: In this paper, the effect of stress on the creep properties of 30 vol.% silicon carbide particulate reinforced 6061 aluminum (SiC p -6061 Al), produced by powder metallurgy, has been studied in the temperature range of 618-678 K. The experimental data, which extend over seven orders of magnitude of strain rate, show that the creep curve exhibits a very short steady-state stage; that the stress exponent, n, is high (n > 7.4) and increases with decreasing the applied stress; and that the apparent activation energy for creep
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