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通过添加不同量的Sn,同时改变合金中Ag、In和Cd含量的方法模拟了Ag-In-Cd合金在反应堆内中子辐照下的成分变化。采用光学显微镜、SEM、XRD研究了成分发生变化情况下合金的微观组织和热导率、比热容、热扩散率和热膨胀率等热物性能。结果表明:由于Sn组元的添加,Ag-In-Cd三元合金转变为Ag-In-Cd-Sn四元合金的同时,其微观结构由原来的单相结构(fcc)转变为双相结构(fcc+hcp),第二相为Ag3In。Ag-In-Cd-Sn合金的热导率、比热容、热扩散率和热膨胀率在25~600℃范围内都随温度的升高而升高,但在相同温度条件下,随合金中Ag含量的减少和Sn含量的增加,合金的热导率和热扩散率会发生明显的下降,而比热和热膨胀率却略有上升。
The composition of Ag-In-Cd alloy under neutron irradiation was simulated by adding different amount of Sn while changing the content of Ag, In and Cd in the alloy. The microstructure, thermal conductivity, specific heat capacity, thermal diffusivity and thermal expansion of the alloy were investigated by optical microscopy, SEM and XRD. The results show that the microstructure of the Ag-In-Cd ternary alloy is changed from the single-phase structure (fcc) to the dual-phase structure (fcc + hcp), the second phase is Ag3In. The thermal conductivity, specific heat capacity, thermal diffusivity and thermal expansion of Ag-In-Cd-Sn alloy all increase with the increase of temperature in the range of 25 ~ 600 ℃. However, with the same temperature, Decrease and Sn content increase, the thermal conductivity and thermal diffusivity of alloy decrease obviously, while the specific heat and thermal expansion rate increase slightly.