Structural change of rapidly solidified 2024 aluminium alloy powders in mechanical milling and subsequent consolidation process

1996 ◽  
Vol 58 (2-3) ◽  
pp. 247-250 ◽  
Author(s):  
Liang Guoxian ◽  
Li Zhichao ◽  
Wang Erde ◽  
Wang Zhongren
Keyword(s):  
Structural Change ◽  
Aluminium Alloy ◽  
Mechanical Milling ◽  
Consolidation Process ◽  
Rapidly Solidified

Fully dense Al–Pb nanocomposite bulk samples consolidated from mechanically milled powders

1998 ◽  
Vol 13 (2) ◽  
pp. 249-252 ◽  
Author(s):  
F. Zhou ◽  
H. W. Sheng ◽  
K. Lu
Keyword(s):  
Melting Point ◽  
Mechanical Milling ◽  
Theoretical Density ◽  
Full Density ◽  
Consolidation Process ◽  
Grain Coarsening ◽  
Grain Sizes ◽  
Milled Powders

Powders with a nanostructured mixture of pure Al and Pb phase were produced by mechanical milling of elemental blends of Al and Pb with a composition of Al90Pb10 (wt. %). Under a pressure of 1.5 GPa at 280 °C, the as-milled powders were successfully consolidated into bulk, full-density samples (>99.5% theoretical density) while the average grain sizes of Al and Pb in the compacted samples remain unchanged with respect to those in the as-milled powders. The achievement of the full density without grain coarsening in the consolidation process could be reasonably attributed to melting of the nanometer-sized Pb particles of which the melting point is considerably depressed.

scholarly journals Lithium Ion Storage Characteristics of Mechanically Fractured Titanate Nanotubes

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Jeongeun Kim ◽  
Minyong Eom ◽  
Yongsub Yoon ◽  
Dongwook Shin
Keyword(s):  
Structural Change ◽  
Cross Sections ◽  
Mechanical Milling ◽  
Treatment Duration ◽  
Lithium Ion ◽  
Titanate Nanotubes ◽  
Titanate Nanotube ◽  
Ion Storage ◽  
Ion Intercalation ◽  
Storage Characteristics

The effect of mechanical milling on the formation of short titanate nanotube and structural change induced is investigated. Mechanical milling produces the short nanotubes with the length of 30–160 nm. The lithium ion intercalation characteristics of the obtained short titanate nanotube were studied to verify the effect of the newly formed cross-sections of nanotubes. It was found that the protonated titanate nanotubes maintained long shapes until 30 min of mechanical milling and were transformed into agglomerated nanosheets and finally anatase granules depending on the treatment duration. Through galvanostatic investigation, the nanotubes with milling of 15 min exhibited the highest discharge capacity of 336 mAh·g−1in first cycle, 12.4% larger than pristine.

Characterization and Comparison of Rapidly Solidified Al Particles Mechanically Milled Nanostructures and their Consolidated Structures Made by High Energy Rate Forming (HERF) Technique

2007 ◽  
Vol 537-538 ◽  
pp. 321-328 ◽  
Author(s):  
Ágnes Csanády ◽  
László Ipacs ◽  
Gyula Kakuk ◽  
Erika Kálmán ◽  
Péter M. Nagy ◽  
...  
Keyword(s):  
Mechanical Milling ◽  
Metal Matrix ◽  
High Energy ◽  
Planetary Mill ◽  
Dynamic Compaction ◽  
Energy Rate ◽  
High Energy Rate ◽  
Forming Technology ◽  
New Type ◽  
Rapidly Solidified

The aim of the present work is to produce new types of solid nanomaterials for different purposes (coatings, fillers, foams, bulk pieces, etc.). Technologies such as RS Al flake production, high energy mechanical milling and high energy rate forming technology (HERF) for compacting are used. The products are analyzed mainly by XRD, SEM and TEM methods. It was shown that the new-type of RS Al “flake” material is suitable not only for pigments but also for powder metallurgical purposes, i.e. Al based nanocomposites. By choosing suitable parameters for mechanical alloying with the Fritsch Planetary mill 4, very fine, alloyed and composited nanostructures can be produced (Al-4.5w%Cu- 10w%Al2O3, Al-15w%Pb) Dynamic compaction (HERF) using explosive techniques seems to offer a good way for the compaction of Al (metal) matrix nanostructured composites.

Sign in / Sign up

Export Citation Format

Share Document