Production of nano-sized grains in powder metallurgy processed pure aluminum by equal channel angular densification (ECAD) and equal channel angular pressing (ECAP)
MATERIALS TESTING, cilt.57, sa.6, ss.580-584, 2015 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 57 Sayı: 6
- Basım Tarihi: 2015
- Doi Numarası: 10.3139/120.110749
- Dergi Adı: MATERIALS TESTING
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.580-584
- Anahtar Kelimeler: Structured sheet metal, thin sheet metal, analysis of the frequency, state of plane stress, cyclic hardening/softening behavior, SEVERE PLASTIC-DEFORMATION, NANOSTRUCTURED MATERIALS, MECHANICAL-PROPERTIES, PARTICLES, CONSOLIDATION, ULTRAFINE, ALLOY, BEHAVIOR, MICROSTRUCTURE, REFINEMENT
- Gazi Üniversitesi Adresli: Evet
Özet
In this study, pure aluminum powders were turned into bulk material using equal channel angular densification (ECAD)/equal channel angular pressing (ECAP) and further deformed up to 16 passes at 100 degrees C. For comparison, pure aluminum powders were also compacted in a mold without ECAD/ECAP process at the same temperature. The microstructures were characterized using TEM for grain size and shape measurements. In general, the grains were finer in the specimens processed by ECAD/ECAP than in the compacted specimen without ECAD/ECAP process. The high density which is very close to the full density of pure aluminum (2.7 g x cm(-3)) was reached at the second pass of ECAD/ECAP. By the application of ECAD/ECAP process, severe plastic deformation enabled particles to be compacted into fully dense materials at much lower temperatures and shorter times, compared to the conventional sintering process. The ECAD/ECAP process was shown to provide an effective method for producing nano-sized grain and nearly full densification in aluminum powder.