不同冷却速率下Zn-2Ni合金包晶凝固研究

孔纲; 卢锦堂; 许乔瑜

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不同冷却速率下Zn-2Ni合金包晶凝固研究
Peritectic Solidification of Zn-Ni Alloy with Different Cooling Rates
2005年第11期
纸质出版日期： 2005 ，
DOI：

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[1]孔纲,卢锦堂,许乔瑜.不同冷却速率下Zn-2Ni合金包晶凝固研究[J].特种铸造及有色合金,2005(11):10-12+4.

Kong Gang Lu Jintang Xu Qiaoyu. Peritectic Solidification of Zn-Ni Alloy with Different Cooling Rates[J]. Special Casting & Nonferrous Alloys, 2005,(11).
[1]孔纲,卢锦堂,许乔瑜.不同冷却速率下Zn-2Ni合金包晶凝固研究[J].特种铸造及有色合金,2005(11):10-12+4. DOI：

Kong Gang Lu Jintang Xu Qiaoyu. Peritectic Solidification of Zn-Ni Alloy with Different Cooling Rates[J]. Special Casting & Nonferrous Alloys, 2005,(11). DOI：

摘要

采用SEM、EDS及XRD研究了Zn2Ni合金从750℃以不同冷却速率冷却的包晶凝固组织特点。结果表明

冷却速率为0.04℃/s时Zn2Ni合金凝固组织中的包晶γ相仅局部依附于初生γ相上生长;冷却速率为1℃/s和36℃/s时合金凝固组织中均未能观察到包晶δ相;表明Zn2Ni合金发生包晶凝固时有别于常规包晶凝固特点

包晶δ相在初生γ相上形核困难且生长速率缓慢。

Abstract

The effects of different cooling rates on the peritectic solidification of Zn-2Ni alloy at 750 ℃ were investigated by SEM and EDS

XRD. The results reveal that the peritectic δ phase can only be partially grown on primary γ phase in solidification structure of the Zn-2Ni alloy at the cooling rate of 0.04 ℃/s while be hardly observed at the cooling rates of 1℃/s and 36℃/s. It is concluded that the peritectic solidification characteristics of Zn-2Ni alloy is different from the typical peritectic solidification ones. The peritectic δ phase is difficult to nucleate on the primary γ phase and very slow in growth rate.