Surface heating by induction

Storm, H. F.

doi:10.1109/ee.1944.6440533

Cited by 1 publication

(3 citation statements)

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“…6a: vertical black arrows). After the BMG is heated to above T g , eddy currents seem to stir the supercooled liquid and crystals preferentially form along these eddy currents 35, 36 . In contrast to the relatively soft and ductile B2 CuZr phase 25, 54 in the other two glasses, the crystalline decomposition products in Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 are very brittle 55 .…”

Section: Resultsmentioning

confidence: 99%

“…The current density is largest near the surface and decreases exponentially towards the sample centre. Hence, the electric charge mainly flows at the surface of the sample because of the mutual repulsion of the electrons 17 , 35 , 36 . This phenomenon is called skin effect and describes a non-uniform current distribution over the cross-section.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon is called skin effect and describes a non-uniform current distribution over the cross-section. The skin depth, s , is defined as the distance from the sample surface at which the current density has decreased to 1/e (36,7%) of its maximum value at the surface 17 , 35 , 36 . In the following, the equation for s for the present experimental setup, shall be deduced starting from the macroscopic Maxwell equations 17 : and where is the electric field density, is the magnetic flux density, is the magnetic field strength, is the electric flux density and t is the time.…”

Section: Resultsmentioning

confidence: 99%

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Inductive flash-annealing of bulk metallic glasses

Kosiba

Pauly

2017

Sci Rep

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We developed a temperature-controlled inductive flash-annealing device, which heats bulk metallic glasses (BMGs) at defined rates of up to 200 K/s to a given temperature. Subsequent instantaneous quenching in water allows preserving the microstructures obtained at various stages of crystallization. One Zr-based and two CuZr-based BMGs were flash-annealed at the onset of crystallization with different heating rates in order to prepare advanced BMG-matrix composites. The highly reproducible composite microstructures contain uniformly dispersed crystals and a narrow crystal size distribution. In order to assess the limitations of the present process, which mainly originate from non-uniform inductive heating, the skin depth was calculated. It is determined to be about 2.3 mm, which enables flash-annealing of rather bulky samples. The cooling rate was estimated from the interlamellar spacing of eutectic Al-Cu alloys to be on the order of 103 K/s. This ensures that decomposition of the microstructure during quenching is prevented. The present flash-annealing procedure is applicable to a wide variety of glass-forming liquids and has a large potential for tailoring the microstructure and, consequently, the mechanical properties of BMG-matrix composites.

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