[1]陈杰,祖方遒,黄中月,等.熔体过热处理作用机制的新认识[J].郑州大学学报(工学版),2009,30(01):14-19.[doi:10.3969/j.issn.1671-6833.2009.01.004]
　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.[doi:10.3969/j.issn.1671-6833.2009.01.004]
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熔体过热处理作用机制的新认识()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
30卷
期数:
2009年01期
页码:
14-19
栏目:
出版日期:
1900-01-01

文章信息/Info

Title:
A new understanding of the mechanism of action of melt superheat treatment
作者:
陈杰; 祖方遒; 黄中月; 等.
合肥工业大学,材料科学与工程学院,安微,合肥,230009, 合肥工业大学,材料科学与工程学院,安微,合肥,230009, 合肥工业大学,材料科学与工程学院,安微,合肥,230009, 合肥工业大学,材料科学与工程学院,安微,合肥,230009
Author(s):
CHEN Jie; Zu Fangxuan; HUANG Zhongyue; etc
关键词:
熔体过热处理;  合金;  液态结构转变;  凝固
Keywords:
DOI:
10.3969/j.issn.1671-6833.2009.01.004
文献标志码:
A
摘要:
从液-液结构转变的角度探讨了熔体过热处理对CuSn18.7(at.%)和BiPb20.1(at.%)合金凝固组织和凝固行为的作用机制.实验表明:在升温过程中,合金熔体的某些物理性能(例如内耗,电阻率,热电势和热)在特定的温度区间都发生了异常的变化,而在降温过程中没有异常变化,揭示了熔体中在这些温度区间内发生了不连续的液-液结构转变.随后的凝固实验表明结构转变对合金的凝固有着很大的影响,例如形核过冷度显著增大,CuSn18.7合金的凝固组织明显细化,而BiPb20.1合金的初生相形态由鱼骨状树枝晶变成无序的等轴晶.分析认为熔体结构转变使得熔体结构趋于均匀和无序,在凝固中抑制了初生相的形核,进而细化凝固组织.而BiPb20.1合金组织形态的变化则是由熔体结构转变改变了界面溶质分配系数导致的.
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.
更新日期/Last Update: 1900-01-01