Microstructure and Thermal Stability of Al-Mg-Mn Alloys by Equal Channel Angular Pressing at Elevated Temperature

Jiang Li Ning; Da Ming Jiang; Bing Yu Qian; Xi Gang Fan; Bao You Zhang; Jie Yu; Xin Mei Zhang

doi:10.4028/www.scientific.net/MSF.546-549.929

Paper Titles

Investigation on Wear Resistance of Al-Si-Ti Piston Alloys Produced by Electrolysis
p.905

Cracking Susceptibility and Joint Property Study of the 6061 Aluminum
p.911

Grain Refinement of an Al-Cu-Mg Alloy by Microalloying and Common Thermo-Mechanical Treatment
p.917

Effects of Electromagnetic Pump Casting on Microstructure and Mechanical Properties of ZLSi9Mg Casting Aluminum Alloy
p.923

Microstructure and Thermal Stability of Al-Mg-Mn Alloys by Equal Channel Angular Pressing at Elevated Temperature
p.929

Morphology and Distribution of in Al-Fe Alloy under an Alternating Magnetic Field
p.933

Effects of Titanium Refining Methods on the Microstructure and Mechanical Properties of A356-0.1%Ti Alloys
p.937

Alloying Behavior of Rare-Earth Er in Al-Cu-Mg-Ag Alloy
p.941

Modifying Effect of Al-Ti-C-P Master Alloy on Hypereutectic Al-Si Alloy
p.947

HomeMaterials Science ForumMaterials Science Forum Vols. 546-549Microstructure and Thermal Stability of Al-Mg-Mn...

Microstructure and Thermal Stability of Al-Mg-Mn Alloys by Equal Channel Angular Pressing at Elevated Temperature

Abstract:

Two Al-Mg-Mn alloys having similar compositions but with and without Zr addition were subjected to equal channel angular pressing (ECAP) at 350°C using route BC and a 90° die, followed by water quenching or air cooling. A series of annealing experiments were conducted at various temperatures from 400°C to 460°C on the water-quenched alloys. Fine structures with grain size of approximately 1~2μm were obtained in these alloys after 6 passes. The water-quenched alloy containing Zr exhibited finer structure compared with the Zr-free alloy in the same cooling condition, which was due to the existence of Al3Zr dispersoids. And in the air cooling condition, it was found that in the Zr-free alloy static recovery occurred, and in partial regions some small grains without dislocation inside appeared suggesting the occurrence of static recrystallization. This demonstrated a fairly restored structure. However, the microstructure of the alloy containing Zr kept stable during the air cooling process. In addition, in the annealing experiments, secondary recrystallization took place in the Zr-free alloy annealed at 410°C for 1h, while the alloy containing Zr kept stable up to 460°C. TEM observation showed that the Al3Zr dispersoids pinned the motion of the grain boundaries, thereby the secondary recrystallization and grain growth were inhibited.