Consolidation behavior of nanocrystalline Al–5at.%Ti alloys synthesized by cryogenic milling

Corrosion behaviour and hardness of in situ consolidated nanostructured Al and Al–Cr alloys produced via high-energy ball milling

“…The yield strength could be extrapolated by hardness assuming, yield strength = hardness/3 [68]. The yield strength of ISC Al-10Cr alloys would therefore be estimated to be ∼1030 MPa, which is approximately two times higher than the yield strength of AA7075-T651 and close to the yield strength of nanostructured Al alloys produced by the consolidation of highenergy ball milled powders [27,[30][31][32][33][34][35][36][37][38][39][40].…”

“…Such a high hardness of Cr containing ISC alloys could be attributed to the nanocrystalline structure, extended solid solubility of Cr, uniformly distributed fine Al-Cr intermetallics, work hardening as introduced by HEBM, and incorporation of elements from processing media and atmosphere. These proposed mechanisms for improved hardness are based on the literature [27,[30][31][32][33][34][35][36][37][38][39][40] as their experimental investigation will require dedicated work and out of scope of this paper.…”

“…There are many instances where high-energy ball milled Al alloys e.g., Al [28,29], Al-Fe [27,30,31], Al-Ti [32,33], Al-Zr [34][35][36], Al-Mg [37][38][39][40] showed a combination of high yield strength and ductility. Such improvement in the mechanical properties was attributed to the dispersion hardening and nanocrystalline structure of highenergy ball milled Al alloys.…”

Synchrotron X-ray and neutron diffraction studies of NaAlH4 containing Ti additives

“…At present, there is no definitive evidence for either of the theories. Indications of Ti/Ti-Al are the H 2 evolution by solution chemistry [1] and that Ti-Al alloys can be prepared by ball milling of the elements [8][9][10][11][12][13][14]. The bulk substitution (doping) hypothesis is supported by electron paramagnetic resonance studies, showing that the predominant Ti species upon addition of either TiCl 3 or Ti(OBu) 4 is a spin isolated Ti III species [15], and preliminary PXD indicated a small, but apparently significant, variation of unit-cell parameters of NaAlH 4 arise upon variation of the additive level [16].…”

Thermal Stability and Microstructure of Nanometric 2024 Aluminum Alloy Powder Obtained by Cryogenic Milling and Spark Plasma Sintering

“…Face-centered cubic (FCC) materials, such as Al and its alloys, are quite ductile; hence, it is difficult to reduce the crystallite size by mechanical milling. The opposite behavior is observed for body-centered cubic (BCC) and hexagonal close-packed (HCP) metals due to an accumulation of defects during milling and rapid recovery kinetics 5,6 . Cryogenic milling is a possible alternative to high-energy milling, where the powders are milled at very low temperatures, e.g.…”