Increasing the ductility and strength of submicrometer-grained P/M aluminium

Sintering Behavior of Nanocrystalline Al6063 Powders Prepared by High-Energy Mechanical Milling

“…Khan et al [26] have produced commercial-purity Al specimens with relative densities of *0.97-0.99 and different grain sizes by mechanical milling to different durations followed by degassing, compaction (cold and warm), sintering and annealing. The beneficial effect of LPS on densification of nanocrystalline Al powder particles have been recently investigated by Fuentes et al [27]. They have reported that blending of the MM Al powder with 0.6 wt% Si as the sintering aid followed by the press and sinter processing, improves both the tensile strength and ductility.…”

“…They have reported that blending of the MM Al powder with 0.6 wt% Si as the sintering aid followed by the press and sinter processing, improves both the tensile strength and ductility. The results of previous investigations [24][25][26][27][28] reveal that grain growth is likely to occur during sintering of nanocrystalline powders so that ultrafine-grained (UFG) compacts with grain sizes in the range of 550-850 nm are achieved according to the processing conditions. In the present work, prealloyed Al6063 powder particles were mechanically milled and then consolidated by cold pressing and sintering to produce PM Al alloy parts.…”

Powder metallurgy Al–6Cr–2Fe–1Ti alloy prepared by melt atomisation and hot ultra-high pressure compaction

“…Several techniques are commonly used for compacting metal powders, such as hot extrusion [3,6], hot isostatic pressing (HIP) [9] and uniaxial pressing [10]. Hot extrusion is the most commonly used of these techniques, but high temperatures negatively affect the final mechanical properties of the material because of the decomposition of supersaturated solid solutions and the growth of Al grains and intermetallic phases.…”