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2019•AIP conference proceedingsRequires access

Influence of milling conditions on the preparation of Fe75Si20B5 solid solution

Ashok Bhakar, P. D. Gupta, Anil Kumar Sinha, Manvendra Narayan Singh, Varimalla Raghavendra Reddy, S. K.

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Abstract

Fe based (Fe75Si20B5) solid solution was prepared in powdered form using a high-energy ball-milling system keeping the material under an Ar atmosphere. Milling parameters such as ball to powder ratio (BPR), milling speed, milling time etc. were optimized to achieve desired micro-structure. X-ray diffraction (XRD) and Mössbauer spectroscopy were used to characterize the evolution of the microstructure with milling. It is observed that in hard milling condition (BPR: 16:1, 350 rpm), after milling for 5 h, the dissolution of B and Si into the Fe lattice leads to the formation of bcc α-Fe(Si,B) solid solution. However, in soft milling conditions (BPR 8:1, 200 rpm) even up to milling for 20 h, alloy remained in unmixed stage and further milling for 40 h results in single phasic FeSiB alloy. LeBail fitting and the modified Williamson Hall (mWH) plot were applied to evaluate the microstructure with milling parameters.

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What this paper is about

Fe based (Fe75Si20B5) solid solution was prepared in powdered form using a high-energy ball-milling system keeping the material under an Ar atmosphere. Milling parameters such as ball to powder ratio (BPR), milling speed, milling time etc. were optimized to achieve desired micro-structure. X-ray diffraction (XRD) and Mössbauer spectroscopy were used to characterize the evolution of the microstructure with milling. It is observed that in hard milling condition (BPR: 16:1, 350 rpm), after milling for 5 h, the dissolution of B and Si into the Fe lattice leads to the formation of bcc α-Fe(Si,B) solid solution. However, in soft milling conditions (BPR 8:1, 200 rpm) even up to milling for 20 h, alloy remained in unmixed stage and further milling for 40 h results in single phasic FeSiB alloy. LeBail fitting and the modified Williamson Hall (mWH) plot were applied to evaluate the microstructure with milling parameters.

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Available abstract

Fe based (Fe75Si20B5) solid solution was prepared in powdered form using a high-energy ball-milling system keeping the material under an Ar atmosphere. Milling parameters such as ball to powder ratio (BPR), milling speed, milling time etc. were optimized to achieve desired micro-structure. X-ray diffraction (XRD) and Mössbauer spectroscopy were used to characterize the evolution of the microstructure with milling. It is observed that in hard milling condition (BPR: 16:1, 350 rpm), after milling for 5 h, the dissolution of B and Si into the Fe lattice leads to the formation of bcc α-Fe(Si,B) solid solution. However, in soft milling conditions (BPR 8:1, 200 rpm) even up to milling for 20 h, alloy remained in unmixed stage and further milling for 40 h results in single phasic FeSiB alloy. LeBail fitting and the modified Williamson Hall (mWH) plot were applied to evaluate the microstructure with milling parameters.

Key concepts: Process engineering, Computer science, Materials science, Engineering

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