Morphology and structure evolution of Y2O3 nanoparticles in ODS steel powders during mechanical alloying and annealing

Schistose and aciculate CuO nanostructures have been synthesized by a novel ammonia assisted hydrothermal method of copper alginate. The conversion processes of copper alginate are investigated by thermogravimetrics (TG) analyses under N2and air atmosphere. The morphology, structure, and composition of the obtained CuO are investigated using SEM,TEM and XRD. It is found that different temperature and pH value resulted in the morphology and structure evolution of CuO. Ammonia was used as structure-directing agent in the hydrothermal system. The aggregation state of the nanostructures was controlled by the temperature. Dispersive schistose structures about 1μm in diameter were synthesized with 0.5mL ammonia at different temperatures. Dispersive microspheres of about 4 μm in diameter were also synthesized with 1 mL ammonia. Microspheres composed of nanoneedles and nanoplates were synthesized at 120°C and 160°C, respectively. Moreover, a possible growth mechanism governing the formation of such a nanomicrostructure was primarily discussed.

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Microstructure and Mechanical Properties of Hot Pressed 16.5CR Ferritic ODS Steel Developed Through Mechanical Alloying

International Journal of Mechanical and Production Engineering Research and Development ◽

10.24247/ijmperdapr201882 ◽

2018 ◽

Vol 8 (2) ◽

pp. 699-708

Author(s):

G. Dharmalingam et al., G. Dharmalingam et al., ◽

Keyword(s):

Mechanical Properties ◽

Mechanical Alloying ◽

Ods Steel ◽

Microstructure And Mechanical Properties

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Crystal Structure Evolution, Microstructure Formation, and Properties of Mechanically Alloyed Ultrafine-Grained Ti-Zr-Nb Alloys at 36≤Ti≤70 (at. %)

Materials ◽

10.3390/ma13030587 ◽

2020 ◽

Vol 13 (3) ◽

pp. 587 ◽

Cited By ~ 2

Author(s):

Marczewski ◽

Miklaszewski ◽

Maeder ◽

Jurczyk

Keyword(s):

Crystal Structure ◽

Mechanical Alloying ◽

Pure Titanium ◽

Young Modulus ◽

High Energy ◽

Structure Evolution ◽

X Ray Diffraction ◽

Mechanically Alloyed ◽

Ultrafine Grained ◽

Energy Ball

Titanium β-type alloys are preferred biomaterials for hard tissue replacements due to the low Young modulus and limitation of harmful aluminum and vanadium present in the commercially available Ti6Al4V alloy. The aim of this study was to develop a new ternary Ti-Zr-Nb system at 36≤Ti≤70 (at. %). The technical viability of preparing Ti-Zr-Nb alloys by high-energy ball-milling in a SPEX 8000 mill has been studied. These materials were prepared by the combination of mechanical alloying and powder metallurgy approach with cold powder compaction and sintering. Changes in the crystal structure as a function of the milling time were investigated using X-ray diffraction. Our study has shown that mechanical alloying supported by cold pressing and sintering at the temperature below α→β transus (600°C) can be applied to synthesize single-phase, ultrafine-grained, bulk Ti(β)-type Ti30Zr17Nb, Ti23Zr25Nb, Ti30Zr26Nb, Ti22Zr34Nb, and Ti30Zr34Nb alloys. Alloys with lower content of Zr and Nb need higher sintering temperatures to have them fully recrystallized. The properties of developed materials are also engrossing in terms of their biomedical use with Young modulus significantly lower than that of pure titanium.

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