Ag-In-Cd合金辐照后的微观组织变化

发布时间：2018-03-29 12:01

本文选题：Ag-In-Cd合金　切入点：堆内辐照　出处：《原子能科学技术》2015年11期

【摘要】：Ag-In-Cd合金在核电站压水堆控制棒中广泛使用,其辐照肿胀行为是评价Ag-In-Cd控制棒使用寿命的关键因素。本文通过制备不同成分的模拟合金,来模拟Ag-In-Cd合金在堆内辐照后的成分变化,分析合金的密度及微观组织特点。结果发现,当Ag含量低至77.5%(质量分数)时,合金会分解为fcc和hcp两相,fcc相中贫Sn高Ag,hcp相中富Sn低Ag。当Ag含量在55%~61%之间时,合金以hcp单相存在。由实测的密度拟合出了合金密度随成分变化的关系式。此结果对于理解和掌握Ag-InCd合金的辐照肿胀行为有重要意义。
[Abstract]:Ag-In-Cd alloy is widely used in PWR control rod of nuclear power station, and its radiation swelling behavior is the key factor to evaluate the service life of Ag-In-Cd control rod. In this paper, the composition changes of Ag-In-Cd alloy after irradiation are simulated by preparing simulated alloy with different composition. The density and microstructure characteristics of the alloy were analyzed. It was found that when Ag content was as low as 77.5% (mass fraction), the alloy would be decomposed into Sn-poor high AgHCP phase in fcc and hcp phase and Sn-rich high AgHCP phase and low Ag content in Ag phase, and when Ag content was between 55% and 61%, the alloy would be decomposed into Sn-rich and low-AgHCP phases. The alloy exists as a single phase of hcp. The relationship between the density of the alloy and the composition of the alloy is fitted from the measured density. This result is of great significance for understanding and mastering the radiation swelling behavior of the Ag-InCd alloy.
【作者单位】：中国核动力研究设计院反应堆燃料及材料重点实验室;
【基金】：大型先进压水堆核电站重大专项资助项目(2011ZX06004-016-003)
【分类号】：TL351.5;TG146.32

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