Influence of Processing Route on Microstructure and Grain Boundary Development During Equal-Channel Angular Pressing of Pure Aluminum

2013 ◽  
pp. 15-24 ◽  
Author(s):  
T.R. McNelley ◽  
D.L. Swisher ◽  
Z. Horita ◽  
T.G. Langdon
Keyword(s):  
Grain Boundary ◽  
Equal Channel Angular Pressing ◽  
Pure Aluminum ◽  
Processing Route ◽  
Angular Pressing

Investigation of Tensile Property and Pore Closure Behavior and the Influence of Processing Route during Equal Channel Angular Pressing of Pure Aluminum Powder Compacts

2014 ◽  
Vol 592-594 ◽  
pp. 444-450 ◽  
Author(s):  
R. Venkatraman ◽  
S. Raghuraman ◽  
R. Balaji ◽  
Kumar K.S. Ajay ◽  
M. Viswanath
Keyword(s):  
Equal Channel Angular Pressing ◽  
Cell Structure ◽  
Pure Aluminum ◽  
Dislocation Cell ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Processing Route ◽  
Angular Pressing ◽  
Ecap Process ◽  
Pore Closure

This paper revolves around the idea of finding the strength enhancement of pure ‘Al’ compacts processed through Equal-Channel Angular Pressing (ECAP) process which ultimately results in fine grain structure of the material processed. The material initially prepared through conventional powder metallurgical route is processed in an ECAP die with a channel angle of 1100. The tensile test and micro-structural evaluation is done following the ECAP process and it is found that there was a substantial enhancement in the tensile properties and Ultrafine Grain (UFG) structure is obtained due to the Severe Plastic Deformation (SPD) phenomenon taking place during the process. The pore closure behavior is also analyzed using the TEM micrographs after each pass in ECAP die and promising results are obtained when the material is processed through different routes. The dislocation cell structure is also found to get refined after each pass through the die. The pore closure behavior is also confirmed using the DEFORM 3D software when the aluminum is simulated under similar conditions.

scholarly journals Development of High-Performance SiCp/Al-Si Composites by Equal Channel Angular Pressing

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 738 ◽  
Author(s):  
Qiong Xu ◽  
Aibin Ma ◽  
Junjie Wang ◽  
Jiapeng Sun ◽  
Jinghua Jiang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Equal Channel Angular Pressing ◽  
High Performance ◽  
Adhesive Wear ◽  
Processing Route ◽  
Matrix Composites ◽  
New Approach ◽  
Angular Pressing ◽  
The Matrix ◽  
Industry Applications

Relatively low compactness and unsatisfactory uniformity of reinforced particles severely restrict the performance and widespread industry applications of the powder metallurgy (PM) metal matrix composites (MMCs). Here, we developed a combined processing route of PM and equal channel angular pressing (ECAP) to enhance the mechanical properties and wear resistance of the SiCp/Al-Si composite. The results indicate that ECAP significantly refined the matrix grains, eliminated pores and promoted the uniformity of the reinforcement particles. After 8p-ECAP, the SiCp/Al-Si composite consisted of ultrafine Al matrix grains (600 nm) modified by uniformly-dispersed Si and SiCp particles, and the composite relative density approached 100%. The hardness and wear resistance of the 8p-ECAP SiCp/Al-Si composite were markedly improved compared to the PM composite. More ECAP passes continued a trend of improvement for the wear resistance and hardness. Moreover, while abrasion and delamination dominated the wear of PM composites, less severe adhesive wear and fatigue mechanisms played more important roles in the wear of PM-ECAP composites. This study demonstrates a new approach to designing wear-resistant Al-MMCs and is readily applicable to other Al-MMCs.

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.

The role of back pressure in the processing of pure aluminum by equal-channel angular pressing

2007 ◽  
Vol 55 (7) ◽  
pp. 2351-2360 ◽  
Author(s):  
Cheng Xu ◽  
Kenong Xia ◽  
Terence G. Langdon
Keyword(s):  
Equal Channel Angular Pressing ◽  
Pure Aluminum ◽  
Back Pressure ◽  
Angular Pressing
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