Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 850, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156724
Keywords
Metallic glass; Two-step spark plasma sintering; Electrical resistivity; Local bridge
Categories
Funding
- Hubei Provincial Natural Science Foundation of China [2018CFB576, 2018CFA003]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515011524]
- National Science Foundation for Distinguished Young Scholars of China [51725504]
- National Natural Science Foundation of China [51601063]
- Fundamental Research Funds for the Central Universities, HUST [2018KFYRCPT001]
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A two-step spark plasma sintering process for amorphous alloys was proposed, and its effects on densification mechanisms, microstructure, and mechanical properties were studied. Results showed significant improvements in density and fracture strength of sintered samples, even at reduced sintering temperatures, due to the lower-temperature pretreatment process enhancing powder billet quality and sintering process.
In this work, a two-step spark plasma sintering process for amorphous alloys was proposed. Densification mechanisms and the effects of the pretreatment process on the microstructure and mechanical properties were studied. The results show that the two-step spark plasma sintering process could significantly improve the density and fracture strength of sintered samples and even reduce the final sintering temperature. The lower-temperature pretreatment process resulted in higher density and more uniform density distribution of the powder billets, which reduced the temperature gap between inside of the powder particles and the contacts, as well as reducing the electrical resistivity of the powder billets. Starting from highly homogeneously packed powder billets, more current flowed to the powders, promoting the discharge effect and internal Joule heat generation. The pre-treated high-quality powder billets enhanced the sintering process, which enabled the realization of a high strength and reduced sintering temperature. (C) 2020 Elsevier B.V. All rights reserved.
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