Consolidation of Fe-Based Metallic Glass Powders by Hot Pressing

Author(s)

Santana, Diego de Araujo ^[1] ; Kiminami, Claudio Shyinti ^[2] ; Coury, Francisco Gil ^{[3, 1]} ; Liberato, Giovanne Lopes ^[2] ; Gargarella, Piter ^[2] ; Kaufman, Michael Joseph ^[3]

Affiliation

^[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Engn Mat, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[3] Colorado Sch Mines, Dept Met & Mat Engn, Golden, CO 80401 - USA

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 22, n. 2 2019.
• Web of Science Citations: 0

Abstract

An alternative route to obtain bulk metallic glasses is by consolidation of metallic glass powders by deforming these materials in the temperature interval between the crystallization temperature and the glass transition temperature, where the material flows with a reduced viscosity. In the present work, bulk parts of the Fe43.2Co28.8B19.2Si4.8Nb4 alloy were produced by hot-pressing gas-atomized powders (GAP) under different uniaxial pressures. Different microstructural analysis revealed that the initial powder as well as the consolidated parts were mostly amorphous, with similar transformation temperatures, showing that bulk samples of this alloy can be produced by conformation in the supercooled liquid region. The sample conformed under the highest pressure (1GPa) exhibited the highest relative density of 96.1 +/- 0.5%. These results show that hot pressing of Fe-based gas-atomized powders is a promising route for producing Fe-based bulk metallic glasses. (AU)

• FAPESP's process: 15/26705-6 - Fabrication of bulk amorphous Fe-Co-B-Si-Nb alloy by atomization and hot extrusion route
• Grantee: Diego de Araujo Santana
• Support Opportunities: Scholarships in Brazil - Master