【摘要】 为了提高碲镉汞红外焦平面探测器封装结构的可靠性，获得组件材料的深低温力学性能十分重要.4J36合金具有极低的膨胀系数且材料焊接性能较好，广泛应用于封装结构中的冷平台部分.本文在300 K～4.2 K温度区间内对4J36合金进行了热力学性能试验，获得了材料随温度变化的动态热力学参数；在300 K、77 K、4.2 K温度下对4J36试件进行了拉伸试验，获得了相应的工程应力应变曲线和力学性能参数；通过扫描电镜对断口形貌进行了微观结构分析，获得了4J36合金拉伸断口微观组织和性能的变化规律.试验结果表明4J36材料在300 K～4.2 K温度范围内平均线膨胀系数为2.08×10^-6/K,从300 K到77 K,4J36合金的比热容随温度降低而减小；在300K～4.2 K温度区间内，随温度降低，合金的抗拉强度和屈服强度显著提高，而弹性模量断后伸长率降低；由拉伸断口宏观和微观形貌看出在300 K、77 K和4.2 K下4J36合金拉伸试件的断裂模式均为韧性断裂.试验研究结果将对4J36合金在红外焦平面探测器组件的低温应用方面提供试验依据.更多还原

【Abstract】 In order to improve the reliability of the packaging structure of HgCdTe infrared focal plane detector, it is very important to obtain the mechanical properties of component materials at cryogenic temperature. In this paper, the thermodynamic properties of 4 J36 alloy were tested in the temperature range of 300 K～4.2 K, and the dynamic thermodynamic parameters of the material changing with temperature were obtained. The tensile tests of 4 J36 specimens were carried out at 300 K, 77 K and 4.2 K, and the corresponding engineering stress-strain curves and mechanical properties parameters were obtained. The fracture morphology was analyzed by scanning electron microscope, and the changing rules of tensile fracture microstructure and properties of 4 J36 alloy were obtained. The experimental results show that the average linear expansion coefficient of 4 J36 material is 2.08×10^-6/K in the temperature range of 300 K～4.2 K, and the specific heat capacity of 4 J36 alloy decreases with the decrease of temperature from 300 K to 77 K. In the temperature range of 300 K～4.2 K, with the decrease of temperature, the tensile strength and yield strength of the alloy significantly increase, while the elongation after breaking and the elastic modulus decrease. From the macroscopic and microscopic morphology of tensile fracture, it can be seen that the fracture modes of 4 J36 alloy tensile specimens at 300 K, 77 K and 4.2 K are ductile fracture. The experimental results will provide experimental basis for the application of 4 J36 alloy in infrared focal plane detector at cryogenic temperature.更多还原