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Effect of sintering temperature on phase evolution of Al86Ni6Y4.5Co2La1.5 bulk amorphous composites synthesized via mechanical alloying and spark plasma sintering

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Progress in Natural Science:Materials International 2019年第1期29卷 32-40页

作者： Ashutosh Sahu ram sajeevan maurya Tapas Laha Department of Metallurgical and Materials Engineering Indian Institute of Technology Department of Metallurgical and Materials Engineering National Institute of Technology

Al86Ni6Y4.5Co2La1.5amorphous powders were synthesized by mechanical alloying for 200 h. Subsequent consolidation was performed via spark plasma sintering in the temperature range of 250 ℃ to 500 ℃ at the pressure of 500 MPa. The role of viscous flow on densification was investigated by studying the viscosity change of the amorphous phase at different consolidation temperatures. The decrease in viscosity at higher sintering temperatures resulted in better particle bonding and densification of consolidated samples. The formation of only FCC Al was observed in the consolidated samples at sintering temperatures ≤ 300 ℃ and the intermetallic phases formed at temperatures ≥ 400 ℃. The mechanical properties of the bulk samples were measured by Vickers microhardness and nanoindentation tests. The testing results showed that the average values of microhardness, nanohardness and elastic modulus of the sample consolidated at 500 ℃ were 3.06 ± 0.14 GPa,4.85 ± 1.14 GPa and 89.53 ± 9.25 GPa, respectively. The increase in hardness and elastic modulus of the higher temperature consolidated samples is attributed to the improvement in particle bonding, densification and distribution of various hard intermetallic phases in the amorphous matrix.

关键词： Al based glassy alloy Mechanical alloying Spark plasma sintering Intermetallic phase Viscosity

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Analyzing the Effects of Milling and Sintering Parameters on Crystalline Phase Evolution and Mechanical Properties of Al_(86)Ni_(8)Y_(6) and Al_(86)Ni_(6)Y_(4.5)Co_(2)La_(1.5) Amorphous Ribbons

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 1043-1054页

作者： Ashutosh Sahu ram sajeevan maurya Lavish Kumar Singh Tapas Laha Department of Mechanical Engineering School of Engineering and TechnologySharda UniversityGreater Noida 201310India Department of Metallurgy Engineering and Materials Science Indian Institute of Technology IndoreIndore 453552India Department of Metallurgical and Materials Engineering Indian Institute of Technology KharagpurKharagpur 721302India

In the present study,Al_(86)Ni_(8)Y_(6) and Al_(86)Ni_(6)Y_(4.5)Co_(2)La_(1.5) bulk amorphous nanocomposites were synthesized by spark plasma sintering of milled melt spun ribbon *** as-cast ribbons were of near amorphous nature with minute amount of FCC Al embedded in the amorphous *** of the ribbons resulted in partial devitrifi cation due to mechanical *** milled ribbon particles were sintered in the temperature and pressure range of 300-500℃ and 500-700 MPa,*** was observed that nominal amount of amorphous phase was retained at 500℃ and 500 *** increase in sintering pressure and decrease in sintering temperature,the amount of crystalline phase evolution decreased,and maximum amount of amorphous phase was retained at 300℃ and 700 *** microstructure consisting of amorphous phase embedded with hard intermetallic phases led to increase in the nanohardness of Al_(86)Ni_(8)Y_(6) and Al_(86)Ni_(6)Y_(4.5)Co_(2)La_(1.5) as-cast ribbons from 3.26±0.59 GPa and 3.81±0.58 GPa to 6.06±0.70 GPa and 6.14±0.82 GPa,respectively,for the corresponding consolidated amorphous *** of the three and five component system bulk samples was 4.19±0.13GPa and 3.6±0.13 GPa,respectively.

关键词： Amorphous alloy Milled ribbon Spark plasma Sintering Nanohardness Internetallic compound

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