| Original Articles |
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Direct Measurement of the Metastable Liquid Miscibility Gap in Fe--Co--Cu Ternary Alloy System |
| CAO Chong-De1;Georg P. GöRLER2 |
| 1Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072
2Institut für Raumsimulation, DLR, D-51170Köln, Germany |
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| Cite this article: |
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CAO Chong-De, Georg P. Gö, RLER 2005 Chin. Phys. Lett. 22 482-484 |
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Abstract The metastable liquid--liquid phase separation in undercooled Fe--Co--Cu ternary alloy melts (XCu=0.10--0.84; XCo:XFe=1:3, 1:1 and 3:1) is investigated by differential thermal analysis in combination with glass fluxing technique. In almost every case, the undercooling of the homogeneous alloy melt was sufficient to reach the boundary line of the submerged miscibility gap. The differential-thermal-analysis signals indicate that this separation into a (Fe,Co)-rich liquid phase L1 and a Cu-rich liquid L2 is exothermic and proceeds until the rapid solidification of the L1 phase occurs. At a given Cu concentration and with the increase of Co content, the phase separation temperatures decrease monotonically between the corresponding values of the boundary systems Fe--Cu and Co--Cu. The boundary lines of the miscibility gap, which are determined for the three quasi-binary cross-sections of the (Fe,Co)--Cu alloy system, show remarkably flat domes. The occurrence of the liquid phase separation shows an evident influence on the subsequent γ-Fe(Co,Cu)→α-Fe(Co, Cu) solid phase transformation.
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| Keywords:
81.30.Bx
64.70.Ja
81.30.Fb
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Published: 01 February 2005
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| PACS: |
81.30.Bx
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(Phase diagrams of metals, alloys, and oxides)
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64.70.Ja
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(Liquid-liquid transitions)
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81.30.Fb
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(Solidification)
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