A New Understanding of The Mechanism of Action of Melt Superheat Treatment
[1]CHEN Jie,ZU Fangxuan,HUANG Zhongyue,et al.A New Understanding of The Mechanism of Action of Melt Superheat Treatment[J].Journal of Zhengzhou University (Engineering Science),2009,30(01):14-19.
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
30
Number of periods:
2009 01
Page number:
14-19
Column:
Public date:
1900-01-01
- Title:
- A New Understanding of The Mechanism of Action of Melt Superheat Treatment
- CLC:
- -
- DOI:
- -
- Abstract:
- The mechanism of melt superheat treatment on the solidification structure and solidification behavior of CuSn18.7(at.%) and BiPb20.1(at.%) alloys was discussed from the perspective of liquid-liquid structure transition. Experiments show that some physical properties of the alloy melt (such as internal friction, resistivity, thermoelectric potential and heat) change abnormally in specific temperature intervals during the heating process, but there are no abnormal changes during the cooling process, revealing that discontinuous liquid-liquid structure transformations occur in these temperature intervals in the melt. Subsequent solidification experiments showed that the structural transformation had a great impact on the solidification of the alloy, for example, the nucleation subcooling degree increased significantly, the solidification microstructure of CuSn18.7 alloy was significantly refined, and the morphology of the primary phase of BiPb20.1 alloy changed from fishbone dendrites to disordered equiaxed crystals. The change of microstructure of BiPb20.1 alloy is caused by the change of interfacial solute partition coefficient by the transformation of melt structure.
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Last Update:
1900-01-01