The thermal stability of nanocrystalline Cu prepared by high energy ball milling

Tao, Jing; Zhu, Xin Kun; Wong, P.Z.; Scattergood, R.O.; Koch, Carl C.

doi:10.1109/inec.2010.5425101

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Oxides have traditionally been used as strengthening agents, and one of ball milling's first applications was to manufacture oxide dispersion‐strengthened (ODS) alloys . Ball milling is also used to create nanocrystalline alloys (e.g., ref .…”

Section: Discussionmentioning

confidence: 99%

Solid‐State Foaming by Oxide Reduction and Expansion: Tailoring the Foamed Metal Microstructure in the Cu–CuO System with Oxide Content and Annealing Conditions

2015

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A new method of introducing porosity into solid metals was investigated using mixtures of Cu and CuO. The process involves distributing oxides through the Cu matrix (e.g., mechanical milling, as used here) and then reducing those oxides during annealing. The most distinguishing characteristic of this process is that pores develop within individual powder particles. In this study, we varied the oxide content (0-7 at% O), annealing temperature (400, 600, and 800°C), and annealing time (up to 3 h) to investigate their effect on the foamed metal microstructure. In general, we find that the amount of porosity within the powder particles (or bulk part) can be controlled by varying of oxide content and annealing parameters. The maximum porosity of 47.4% corresponds to intermediate conditions of both temperature and oxide content (600°C and %3 at% CuO, respectively). The pore size and grain size are small (<5 mm) in comparison with other solid-state foaming techniques and are not highly sensitive to the annealing parameters used in the present study. The unique mechanisms and opportunities associated with this oxide reduction and expansion process are discussed for the Cu-CuO system as well as extensions to other metal systems.

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Section: Discussionmentioning

confidence: 99%

Solid‐State Foaming by Oxide Reduction and Expansion: Tailoring the Foamed Metal Microstructure in the Cu–CuO System with Oxide Content and Annealing Conditions

2015

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“…The second curves measured in a second cycle shows that all these peaks have disappeared indicating non reversible phase transitions. The first peak of curve 1 corresponds to the restoration of defects created by the MA process, while the second one corresponds to the crystallization of the formed phases [31][32][33]. The XRD pattern was measured and analyzed after DSC.…”

Section: Thermal Treatmentmentioning

confidence: 99%

Structural and hydrogen storage properties of LaCaMgNi9-type alloy obtained by mechanical alloying

Chebab

Abdellaoui²,

Latroche

et al. 2015

Mater Renew Sustain Energy

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The AB 3 -type LaCaMgNi 9 compound was synthesized using mechanical alloying (MA) starting from elemental La, Ca, Mg, and Ni in the atomic ratio 1:1:1:9. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to study the phase evolution and formation/kinetic mechanism as a function of milling time (4-30 h). The results show multiphase alloys containing LaCaMgNi 9 as a main phase with trigonal PuNi 3 -type structure (R-3m space group) where Ca atoms occupy preferentially the 3a site, while La and Mg atoms occupy the 6c site with a mean composition CaLa 1.2(2) Mg 0.8(2) Ni 9 . The hydrogenation properties of the alloys were examined by solid-gas reaction at room temperature. The PCI curves showed a plateau pressure of 0.25 bar which corresponds to the AB 3 phase. The hydrogen absorption capacity of the AB 3 phase is equal to 5.6 H/u.f AB3 .

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The thermal stability of nanocrystalline Cu prepared by high energy ball milling

Cited by 2 publications

References 7 publications

Solid‐State Foaming by Oxide Reduction and Expansion: Tailoring the Foamed Metal Microstructure in the Cu–CuO System with Oxide Content and Annealing Conditions

Solid‐State Foaming by Oxide Reduction and Expansion: Tailoring the Foamed Metal Microstructure in the Cu–CuO System with Oxide Content and Annealing Conditions

Structural and hydrogen storage properties of LaCaMgNi9-type alloy obtained by mechanical alloying

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