Casting vacuum effects on the precipitates and magnetic properties of Fe-based glassy alloys |
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Authors: | W-M Wang JT Zhang S Roth |
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Institution: | a Key Lab of Liquid-Solid Structural Evolution and Processing of Materials, Shandong University, Jinan 250061, Chinab Institute for Metallic Materials, IFW-Dresden, P.O. 270016, D-01171 Dresden, Germany |
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Abstract: | The crystalline precipitates and magnetic properties of the Fe61Co9 − xZr8Mo5WxB17 (x = 0 and 2) cylinders prepared under various vacuum conditions were investigated in this paper. The fraction of the crystalline precipitates and liquidus temperature of the samples with tungsten content cW = 0 decease with decreasing vacuum, while they increase in the samples with cW = 2 at.%. For both tungsten contents, with decreasing vacuum, the magnetization at room temperature Mstart and Curie temperature Thc of the samples decrease gradually, but the increment of magnetization ΔM800 K at 800 K after heating to 973 K increases and the Curie temperature Tcc of the residual amorphous matrix shows a decreasing tendency simultaneously. Meanwhile, with decreasing vacuum, Zr-B compounds tend to precipitate easily out from the melt or to remain undissolved during casting, and eutectic Fe-B compounds tend to be formed easily after heating to 973 K. The existence of Zr-B and Fe-B compounds changes the boron content in the residual melt/matrix and consequently affects the magnetic properties of the samples in the as-quenched state and after heating to 973 K. |
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Keywords: | Metallic glass Magnetic properties Phase identification X-ray diffraction |
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