Al-Ag功能梯度复合材料的制备及其性能研究  

Preparation and properties study of Al-Ag functional gradient composites

作　　者：张杨 杨学斌 李培博 罗国强[1,2] 沈强 孙一[1,3] ZHANG Yang;YANG Xuebin;LI Peibo;LUO Guoqiang;SHEN Qiang;SUN Yi(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory,Chaozhou 521000,China;Hubei Longzhong Laboratory,Xiangyang 441000,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]化学与精细化工广东省实验室潮州分中心,广东潮州521000 [3]湖北隆中实验室,湖北襄阳441000

出　　处：《功能材料》2025年第4期4032-4040,共9页Journal of Functional Materials

基　　金：国家重点研发计划项目(2021YFB3802300);广东省基础与应用基础研究重大专项(2021B0301030001);湖北省隆中实验室自主创新项目(2022ZZ-33);国家自然科学基金项目(52104363)。

摘　　要：准等熵压缩实验可以通过轻气炮驱动不同阻抗分布的弹丸材料实现。弹丸的阻抗分布决定了加载的应力-应变率范围。采用粉末铺层结合热压烧结工艺制备了阻抗连续变化的Al-Ag梯度复合材料,并对单层Al-Ag复合材料以及Al-Ag梯度复合材料的结构与性能进行了研究。结果表明,Al-Ag梯度复合材料的最佳烧结工艺为570℃-100 MPa-2 h,各组分的Al-Ag复合材料致密度均大于95%。除此之外,各组分的Al-Ag复合材料的力学性能、SEM、热膨胀系数结果均表明Al-Ag梯度复合材料的可行性。Al-Ag梯度复合材料的SEM和EDS结果表明梯度复合材料内部元素分布与设计方案一致,层间平行度较好。动态加载实验结果显示Al-Ag梯度复合材料具有良好的准等熵加载效果,有明显的准等熵加载效果,与模拟结果吻合较好。制备的Al-Ag梯度复合材料具有稳定的准等熵压缩效果,为探究不同应力-应变率下的材料的高压物性参数及损伤机制提供了支撑。The quasi-isentropic compression experiment can be realized by using a light gas gun to drive projectile materials with different impedance distributions.The impedance distribution of the projectile determines the range of stress-strain rate under load.In this paper,Al-Ag gradient composites with continuous impedance change were prepared by powder layering combined with hot pressing sintering,and the structure and properties of single-layer Al-Ag and Al-Ag gradient composites were studied.The experimental results show that the optimum sintering process of Al-Ag gradient composites is 570℃-100 MPa-2 h,and the density of Al-Ag gradient composites is greater than 95%.In addition,the results of mechanical properties,SEM and thermal expansion coefficient of each component of Al-Ag composite indicate the feasibility of Al-Ag gradient composite.The SEM and EDS results of Al-Ag gradient composites show that the distribution of elements inside the gradient composites is consistent with the design scheme,and the parallelism between layers is good.The experimental results of dynamic loading show that Al-Ag gradient composites have good quasi-isentropic loading effect,and have obvious quasi-isentropic loading effect,which is in good agreement with the simulation results.The Al-Ag gradient composite prepared in this study has a stable quasi-isentropic compression effect,which provides support for exploring the high pressure physical property parameters and damage mechanism of materials at different stress-strain rates.

关 键 词：梯度复合材料 Al-Ag 致密化 准等熵压缩 

分 类 号：TF125[冶金工程—粉末冶金]