2016
DOI: 10.1016/j.apt.2016.05.010
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Deformation, decomposition and hardening behavior of nano Al7075 alloy prepared by mechanical milling and hot pressing

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Cited by 13 publications
(12 citation statements)
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“…Both the evaluation of the crystallite size from the broadening of XRD peaks and the TEM investigation of the milled powder particles confirmed a nanocrystalline microstructure with the grain size between 20 and 100 nm ( Figure 8 ), which is comparable with the spatial resolution limit for EBSD. A similar grain size was observed in an AlZnMgCuZr alloy after mechanical milling for 40 h from elemental powders (27 nm) [ 17 ] in an Al7075 alloy after cryomilling for 10 h (28 nm) [ 36 ] and in the same alloy milled at room temperature for 20 h (26 nm) [ 18 ]. A comparison with our results shows that the rate of grain refinement is significantly higher in our case.…”
Section: Discussionsupporting
confidence: 59%
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“…Both the evaluation of the crystallite size from the broadening of XRD peaks and the TEM investigation of the milled powder particles confirmed a nanocrystalline microstructure with the grain size between 20 and 100 nm ( Figure 8 ), which is comparable with the spatial resolution limit for EBSD. A similar grain size was observed in an AlZnMgCuZr alloy after mechanical milling for 40 h from elemental powders (27 nm) [ 17 ] in an Al7075 alloy after cryomilling for 10 h (28 nm) [ 36 ] and in the same alloy milled at room temperature for 20 h (26 nm) [ 18 ]. A comparison with our results shows that the rate of grain refinement is significantly higher in our case.…”
Section: Discussionsupporting
confidence: 59%
“…TEM investigations confirmed the precipitate-free microstructure of the milled powder. A similar process of precipitate dissolution during milling has been observed in mechanically alloyed Al7075 after 15 h of milling [ 47 ], in a mechanically alloyed Al-Zn-Mg-Cu-Zr alloy after 40 h of milling [ 17 ], in a spray-atomized 7075 alloy after 10 h of cryomilling [ 36 ], and in a mechanically milled 7075 alloy after 20 h of milling [ 18 ]. This extension of solubility can be attributed to enhanced diffusivity due to an increased dislocation density and volume fraction of atoms in the grain boundary area [ 5 , 48 ].…”
Section: Discussionmentioning
confidence: 60%
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“…The nanocrystalline microstructure contributed to a very high microhardness of 234 HV despite the presence of 3 to 7 vol % of pores in the hot pressed compact. Similarly, high microhardness values were found also in the mechanically alloyed and hot pressed Al7075 alloy [ 14 ]. The lowest porosity (below 1 vol %) was reported by Saheb et al in mechanically milled and spark plasma sintered Al–SiC nanocomposites [ 15 ].…”
Section: Introductionmentioning
confidence: 87%