Milling maps and amorphization during mechanical alloying

Murty, B.S.; Rao, M. Mohan; Ranganathan, S.

doi:10.1016/0956-7151(94)00402-1

Cited by 98 publications

(53 citation statements)

References 13 publications

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“…It is important to know the relationship between processing variables and milling energy, as well as the energy transfers to the milled powder during processing. The milling energy can be calculated from mathematical models [13,14] or direct measurement [15,16]. A method using the electrical energy consumption during the milling process has been systematically reported by Magini et al [17], where the energy transferred to the material was studied by measuring the energy input into the mill with empty and filled vials using a high-precision electrical power meter.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

Huynh¹,

Kim²,

Kim³

2017

Archives of Metallurgy and Materials

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The in situ formation of TiB 2 particulates via an interface reaction between Ti and FeB powders was studied. The effects of mechanical activation by high-energy milling on the decomposition of TiH 2 and the interface reactions between Ti and FeB powders to form TiB 2 were investigated. Powder mixtures were fabricated using planetary ball-milling under various milling conditions. The specific ball-milling energy was calculated from the measured electrical power consumption during milling process. High specific milling energy (152.6 kJ/g) resulted in a size reduction and homogeneous dispersion of constituent powders. This resulted in a decrease in the decomposition temperature of TiH 2 and an increase in the formation reaction of TiB 2 particulates in the Fe matrix, resulting in a homogeneous microstructure of nanoscale TiB 2 evenly distributed within the Fe matrix. In contrast, the powder mixture milled with low specific milling energy (36.5 kJ/g) showed an inhomogeneous microstructure composed of relatively large Fe-Fe 2 B particles surrounded by a thin layer of Fe-TiB 2 within a finely dispersed Fe-TiB 2 matrix region.

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Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

Huynh¹,

Kim²,

Kim³

2017

Archives of Metallurgy and Materials

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“…Mismatch entropy (DS r ) was calculated using Mansoori's approach for random close packing of hard spheres, [24] per Eq. [4].…”

Section: Thermodynamic Modelingmentioning

confidence: 95%

“…[1][2][3] Amorphous phase formation by the MA route depends on several process parameters and the elemental constitution of initial powders. [4,5] The amorphous phase forming ability (AFA) of an alloy can be predicted from elemental constitution using glass forming ability (GFA) models, though GFA specifically refers to the ease with which a liquid alloy transforms to an amorphous solid (glass) on cooling.…”

Section: Introductionmentioning

confidence: 99%

On Prediction of Amorphous Phase Forming Compositions in the Iron-Rich Fe-Zr-B Ternary System and Their Synthesis

Rao

Shah

Srinivas

et al. 2011

Metall Mater Trans A

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A thermodynamic model parameter P H-S , which is a product of enthalpy of chemical mixing and mismatch entropy normalized by Boltzmann's constant, was used as a guiding tool to predict amorphous phase forming compositions in Fe-rich alloys of the Fe-Zr-B system. Attempts were made to evaluate the effect of Zr addition on the P H-S parameter and phase formation by mechanical alloying (MA) and rapid solidification processing (RSP). A systematic evaluation of the P H-S parameter of various binary compounds in the Fe-Zr-B system and ternary alloys indicated~-7 kJ/mol as a lower bound for the formation of amorphous phase. Model predictions were verified with phase formation in two random compositions in the Fe-rich end of the Fe-Zr-B system synthesized by MA and RSP.

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“…Beyond 5 h of milling the size of the particles gets reduced due to fracture of the particles which leads to size reduction. The lowest particle size of 25.59 µm is attained after 20 h of milling [12][13][14]. E-Glass fibers are the most widely used glass fibers as reinforcement in the composites.…”

Section: Fig4:-particle Size Analysis For (A) Unmilled Cu and (B) 20mentioning

confidence: 99%

Development of Cu-E-Glass Fiber Composites by Powder Metallurgy Route

Bhuyan

Singh

Kumar

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract:Cu-E glass fiber composites were developed with different vol. % of E-glass fiber (10, 20, 30 and 40 vol. %) by powder metallurgy route. Both as-received Cu and nanostructured Cu developed by milling as-received Cu powder for 20 h were used to develop various Cu-E-glass fiber composites. The effect of using as-received Cu powder and nanostructured Cu powder on the properties of the various Cu-E-glass fiber composites was analysed. The samples were sintered at 900 o C for 1 h in inert atmosphere. The results show good bonding between the matrix and the reinforcement and there is homogeneous distribution of the reinforcement in the matrix. . The hardness of the Cu-E-glass fiber composites was found to increase from 0.8GPa to 2.7GPa with increase in vol. % of the glass fiber in case of unmilled and from 1.2GPa to 2.9GPa for the milled Cu-E-glass fiber composites. The as-milled Cu-Eglass fiber composites shows better densification and sinterability compared to the unmilled Cu-E-glass fiber composites

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Milling maps and amorphization during mechanical alloying

Cited by 98 publications

References 13 publications

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

On Prediction of Amorphous Phase Forming Compositions in the Iron-Rich Fe-Zr-B Ternary System and Their Synthesis

Development of Cu-E-Glass Fiber Composites by Powder Metallurgy Route

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