Ni-Ag偏晶合金凝固过程研究

doi:10.3724/SP.J.1037.2012.00422

金属学报

2012, Vol. 48

Issue (11): 1381-1386 DOI: 10.3724/SP.J.1037.2012.00422

论文

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Ni-Ag偏晶合金凝固过程研究

赵雷, 赵九洲

中国科学院金属研究所, 沈阳 110016

STUDY OF THE SOLIDIFICATION OF Ni-Ag MONOTECTIC ALLOY

ZHAO Lei, ZHAO Jiuzhou

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

赵雷赵九洲. Ni-Ag偏晶合金凝固过程研究[J]. 金属学报, 2012, 48(11): 1381-1386.
ZHAO Lei Jiuzhou. STUDY OF THE SOLIDIFICATION OF Ni-Ag MONOTECTIC ALLOY[J]. Acta Metall Sin, 2012, 48(11): 1381-1386.

全文: PDF(716 KB)

摘要:

对Ni-Ag偏晶合金开展了喷铸快速凝固实验, 获得了富Ag相粒子弥散分布于Ni基体相的复合凝固组织. 建立了Ni-Ag偏晶合金喷铸快速凝固过程中组织演变的动力学模型, 模拟分析了喷铸Ni-Ag合金凝固组织形成过程. 结果表明: 在喷铸快速凝固条件下, Ni-Ag合金液-液相变过程中富Ag相液滴的Ostwald粗化作用很弱, 初生富Ag相粒子的弥散度主要由液-液相变过程中富Ag相液滴形核率决定, 初生富Ag相粒子的数量密度和平均半径与液-液相变过程中富Ag相液滴形核阶段熔体冷却速率间满足 N\propto\dot{T}_Nuc^1.8和<R>\propto\dot{T}_Nuc^-0.6的指数关系.

关键词 ： Ni-Ag偏晶合金, 液-液相变, 快速凝固, 喷铸, 模拟

Abstract：

The Ni-Ag alloy has good mechanical properties, high corrosion resistance and electrical conductivity. It is an excellent candidate to be used in many high-tech fields of aerospace, energy resource and chemical engineering etc. This alloy, however, is a typical monotectic system. Generally, the liquid--liquid phase transformation leads to the formation of a solidification microstructure with serious phase segregation. The manufacturing of this alloy is thus extremely difficult. Injection casting has already been carried out with the Ni-Ag monotectic alloy. The sample with composite microstructure, in which Ag-rich particles dispersed homogeneously in Ni matrix has been obtained. A model describing the microstructure evolution during injection casting of the Ni-Ag monotectic alloy has been proposed. The process of microstructure formation has been simulated and discussed in details. The results indicate that the Ostwald coarsening of Ag-rich droplets is very weak during cooling in miscibility gap under injection casting cooling conditions. The dispersivity of the primary Ag--rich phase is controlled by the nucleation of Ag-rich droplets during the liquid-liquid transformation. The number density ( $N$ ) and average radius (<R>) of primary Ag--rich particles depend exponentially on the cooling rate of the alloy during the nucleation of Ag-rich droplets ( $\dot{T}_{\rm Nuc}$ ) according to $N\propto\dot{T}_{\rm Nuc}^{1.8}$ and $\langle R\rangle\propto\dot{T}_{\rm Nuc}^{-0.6}$ .

Key words： Ni-Ag monotectic alloy liquid-liquid transformation rapid solidification injection casting simulation

收稿日期: 2012-07-12

ZTFLH:

TG111.4

基金资助:

国家自然科学基金项目u0837601, 51071159和51031003资助

作者简介: 赵雷, 男, 1981年生, 博士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00422 或 https://www.ams.org.cn/CN/Y2012/V48/I11/1381

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