Phase transformation in Nb—16 at.% Si processed by high-energy ball milling

Perdigão, M.N.R.V.; Jordão, JoséA.R.; Kiminami, Cláudio S.; Botta, Walter José

doi:10.1016/s0022-3093(97)00325-6

Cited by 18 publications

(11 citation statements)

References 14 publications

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“…A halo was formed in Nb-37.5Si, Nb-25Si-12.5B, and Nb-12.5Si-25B powders after milling for 30 h, which can be associated to the formation of an amorphous phase. Previous work has indicated that an amorphous phase can be formed during ball milling in Nb-Si powder mixtures [14]. In Nb-37.5Si powders, the T 2 -phase was partially formed after milling for 60 h. In contrary, no intermetallic peaks were identified in Nb-25Si-12.5B and Nb-12.5Si-25B powders after milling for 100 h.…”

Section: Methodsmentioning

confidence: 86%

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On the T2-phase formation in mechanically alloyed Nb–Si and Nb–Si–B powders

Fernandes

Rodrigues²,

Silva

et al. 2007

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 86%

“…: +55 12 39471103; fax: +55 12 39471149. Studies on the preparation of Nb-Si binary alloys by mechanical alloying have been realized [14]. Recently, the mechanical alloying and further heat treatment of Nb-25Si-12.5B powders successfully produced a large amount of T 2 -phase [15].…”

Section: Introductionmentioning

confidence: 99%

On the T2-phase formation in mechanically alloyed Nb–Si and Nb–Si–B powders

Fernandes

Rodrigues²,

Silva

et al. 2007

Journal of Alloys and Compounds

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“…9 As powder source, mechanical alloying and gas atomization are chosen. While there was previous research on PM processing of niobium silicides by mechanical alloying [10][11][12] or gas atomization, 5 the combination with net-shape capable compaction processes and advanced multicomponent alloys is unique and, thus, the main focus of this study. As PM generally delivers a fine-grained microstructure, additional coarsening heat treatments are necessary to improve high-temperature creep resistance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Powder Metallurgical Processing Routes on Phase Formations in a Multicomponent NbSi-Alloy

Seemüller

Hartwig

Mulser

et al. 2014

JOM

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Refractory metal silicide composites on the basis of Nb ss -Nb 5 Si 3 have been investigated as potential alternatives for nickel-base superalloys for years because of their low densities and good high-temperature strengths. NbSibased composites are typically produced by arc-melting or casting. Samples in this study, however, were produced by powder metallurgy because of the potential for near net-shape component fabrication with very homogeneous microstructures. Either gas atomized powder or high-energy mechanically alloyed elemental powders were compacted by powder injection molding or hot isostatic pressing. Heat treatments were applied for phase stability evaluation. Slight compositional changes (oxygen, nitrogen, or iron) introduced by the processing route, i.e., powder production and consolidation, can affect phase formations and phase transitions during the process. Special focus is put on the distinction between different silicides (Nb 5 Si 3 and Nb 3 Si) and silicide modifications (a-, b-, and c-Nb 5 Si 3 ), respectively. These were evaluated by x-ray diffraction and energy-dispersive spectroscopy measurements with the additional inclusion of thermodynamic calculations using the calculated phase diagram method.

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“…As compared with the arc-melted counterparts, Nb-Si alloys fabricated by spark plasma sintering owned fine grains because of the short holding time. Until recently, few reports have exhibited the microstructure and mechanical properties of Nb-Si alloys based on a Nb-Si-Ti ternary system by reactive hot-pressing sintering [16], and the synthesis of niobium silicides by ball milling of powder mixtures with different Si content of Nb-Si binary system [17][18][19]. However, rare report has been available on the influence of control agent on the mechanical alloying of Nb-Si powders, and the effect of processing parameters and routes of hot-pressing sintering on the microstructure and mechanical properties of Nb-Si alloys.…”

Section: Introductionmentioning

confidence: 99%