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Microstructure Evolution and Properties of In Situ Micro/Nanoscale Mo2C Reinforced Copper Composite Synthesized by Hot-Pressing Consolidation of Mechanical Alloying Powders

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Abstract

Cu+Mo+C powders were mechanically alloyed and hot-pressed to obtain in-situ micro/nanoscale Mo2C reinforced Cu-matrix composites. Both powders and sintered compacts were characterized and assessed for the hardness and electrical conductivity to study the alloying time effect on materials microstructure evolution and properties. During milling, Mo reacted with C forming a little MoC. As the milling time increased from 60 to 120 h, flaky powder particles were replaced by finer granular particles composed of Cu and Mo nanocrystals. For 84 h- and 120 h-milled powders, Mo combined with C besides MoC+Mo forming P63/mmc hexagonal-structured Mo2C without residual Mo during sintering, instead of primitive hexagonal Mo2C in the case of un-milled powders. Both types of Mo2C occurred in the sintered sample of 60 h-milled powders. In-situ formed Mo2C especially with nanoscale sizes in the 120 h-milled powders’ sintered composites with good electrical property was responsible for the hardness improvement by 63.6% than the un-milled case.

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Acknowledgments

This work was supported by Natural Science Foundation of Shandong Province of China under Grant Number ZR2017MEM001 and National Natural Science Foundation of China under Grant Number 52174346.

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  1. School of Materials Science and Engineering, Liaocheng University, Liaocheng, 252059, China

    Yu Bian & Junjie Ni

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  1. Yu Bian
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  2. Junjie Ni
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Correspondence to Junjie Ni.

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Bian, Y., Ni, J. Microstructure Evolution and Properties of In Situ Micro/Nanoscale Mo2C Reinforced Copper Composite Synthesized by Hot-Pressing Consolidation of Mechanical Alloying Powders. J. of Materi Eng and Perform 31, 4604–4610 (2022). https://doi.org/10.1007/s11665-021-06572-9

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  • DOI: https://doi.org/10.1007/s11665-021-06572-9

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