2018
DOI: 10.1016/j.powtec.2018.07.094
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The ball to powder ratio (BPR) dependent morphology and microstructure of tungsten powder refined by ball milling

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Cited by 27 publications
(18 citation statements)
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“…Initially, the milled powders coarsened for times of up to 4 h and accompanied by a transition in the particle morphologies from spherical for the W feedstock powder, as shown in the scanning electron micrograph in Figure 5b, to platelet-like geometries in Figure 5c. This morphological transition is consistent with the study by Wu et al [16] on the effect of media-to-powder ratio and indicative of a high rate of cold welding [17] combined with deformation along preferred slip systems in the coarse grain W powders [18]. Milling for additional time produced a rapid reduction in the particle size between 4 and 6 h, which we attributed to the dominant mechanism shifting toward fracture due to refinement of the grain size during this period, as shown in Figure 2b.…”
Section: Texture Evolution and Its Implications For Powder Morphologiessupporting
confidence: 94%
See 1 more Smart Citation
“…Initially, the milled powders coarsened for times of up to 4 h and accompanied by a transition in the particle morphologies from spherical for the W feedstock powder, as shown in the scanning electron micrograph in Figure 5b, to platelet-like geometries in Figure 5c. This morphological transition is consistent with the study by Wu et al [16] on the effect of media-to-powder ratio and indicative of a high rate of cold welding [17] combined with deformation along preferred slip systems in the coarse grain W powders [18]. Milling for additional time produced a rapid reduction in the particle size between 4 and 6 h, which we attributed to the dominant mechanism shifting toward fracture due to refinement of the grain size during this period, as shown in Figure 2b.…”
Section: Texture Evolution and Its Implications For Powder Morphologiessupporting
confidence: 94%
“…Microstructures produced via planetary ball milling ultimately depend on the characteristics of the particle impact (e.g., energy, frequency, etc. ), which are dictated by the processing parameters, including mediato-powder ratio, milling speed, atmosphere, temperature, total effective time (sometimes including intermittent off time measured by an effective duty cycle), and the selected process control agent (PCA) [15][16][17][18]. In addition to the high-volume fraction of grain boundaries intrinsic to the nanocrystalline state produced via high-energy ball milling, processed powders also contain an appreciable number of other defects including point defects, stacking faults, dislocations, and shear bands [19].…”
Section: Introductionmentioning
confidence: 99%
“…Thus, these results indicate the complete conversion of Cu­(OH) 2 into CuO with only 20 min of milling. The charge ratio implies directly the reaction time since the higher the charge ratio is, the higher the frequency of the shocks and consequently the energy released during the milling are. , However, increasing the charge ratio too much is not always the answer because it may provide an undesired material amorphization . No precursor phases were detected when the reactions were performed at 1500 rpm (MCS-5) with 20 min of milling.…”
Section: Resultsmentioning
confidence: 99%
“…The high ductility of Al and the heat generated during milling due to the high impact collision forces between the balls and the Al powders resulted in Al agglomeration. As a result, welding became more dominant than fracturing (Suryanarayana, 2019;Wu et al, 2018). The significant increase in the average particle size of the initial fine powders from 15 μm to 0.45 mm after 2 h of milling, indicated that cold welding of the Al particles was clearly activated, see Figure 2B.…”
Section: Conventional Milling Vialmentioning
confidence: 99%