Production of nano-sized grains in powder metallurgy processed pure aluminum by equal channel angular densification (ECAD) and equal channel angular pressing (ECAP)

2015 ◽  
Vol 57 (6) ◽  
pp. 580-584 ◽  
Author(s):  
Melih Turan İpekçi ◽  
Ahmet Güral ◽  
Süleyman Tekeli
Keyword(s):  
Powder Metallurgy ◽  
Equal Channel Angular Pressing ◽  
Pure Aluminum ◽  
Angular Pressing

Micro-Embossing Process in Ultrafine-Grained Pure Aluminum Processed by Equal-Channel Angular Pressing with Elevated Temperature

2019 ◽  
Vol 821 ◽  
pp. 244-249
Author(s):  
Qian Su ◽  
Jie Xu ◽  
Lei Shi ◽  
De Bin Shan ◽  
Bin Guo
Keyword(s):  
Equal Channel Angular Pressing ◽  
Deformation Temperature ◽  
Pure Aluminum ◽  
Confocal Scanning Laser Microscopy ◽  
Electron Backscattered Diffraction ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Scanning Laser Microscopy ◽  
Confocal Scanning ◽  
Confocal Scanning Laser

Micro-embossing tests were performed on ultrafine-grained pure Al processed by equal-channel angular pressing (ECAP) with 100 μm width of female die at different deformation temperature ranging from 298 K to 523 K under a force of 5 kN. The filling height, surface topography and microstructure of the cross section were measured by confocal scanning laser microscopy (CSLM), scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD), respectively. The effects of deformation temperature on formability of ultrafine-grained (UFG) pure Al during micro-embossing were analyzed. The results show that increase in deformation temperature can improve the formability of UFG pure Al on micro-embossing. Micro hot embossing of UFG pure aluminum is characterized by the rib sidewall, surface quality, and fully transferred patterns, which shows ultrafine-grained pure Al has potential application in micro-forming.

Achieving Both Powder Consolidation and Grain Refinement for Bulk Nanostructured Materials by Equal-Channel Angular Pressing

2007 ◽  
Vol 345-346 ◽  
pp. 173-176 ◽  
Author(s):  
Seung Chae Yoon ◽  
Do Minh Nghiep ◽  
Sun Ig Hong ◽  
Z. Horita ◽  
Hyoung Seop Kim
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Powder Metallurgy ◽  
Grain Refinement ◽  
Nanostructured Materials ◽  
Equal Channel Angular Pressing ◽  
Bottom Up ◽  
Powder Consolidation ◽  
Metallic Powders ◽  
Angular Pressing

Manufacturing bulk nanostructured materials with least grain growth from initial powders is challenging because of the bottle neck of bottom-up methods using the conventional powder metallurgy of compaction and sintering. In this study, bottom-up type powder metallurgy processing and top-down type SPD (Severe Plastic Deformation) approaches were combined in order to achieve both full density and grain refinement of metallic powders. ECAP (Equal-Channel Angular Pressing), one of the most promising processes in SPD, was used for the powder consolidation method. For understanding the ECAP process, investigating the powder density as well as internal stress, strain and strain rate distribution is crucial. We investigated the consolidation and plastic deformation of the metallic powders during ECAP using the finite element simulations. Almost independent behavior of powder densification in the entry channel and shear deformation in the main deformation zone was found by the finite element method in conjunction with a pressure dependent material yield model. Effects of processing parameters on densification and density distributions were investigated.

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