摘要
基于波阻抗梯度材料的准等熵加载技术是掌握材料动态响应特性的重要技术手段,对于提升材料服役性能至关重要。采用电子束蒸发镀膜技术成功制备出Ti-Pt周期调制梯度材料,通过对周期层内双组分(Ti和Pt单层)厚度的调控,实现了波阻抗的宏观梯度变化。梯度材料实测总厚度与理论设计总厚度的误差仅为1.67%,并且实测平均硬度及弹性模量分别为2.8和99.8 GPa。材料内部层界面清晰,物相分析未发现金属合金相。利用一级轻气炮驱动TiPt周期调制梯度材料加载5μm厚Al靶,在Al靶内产生冲击-准等熵加载波形。数值模拟结果与实验曲线在上升趋势上吻合良好,5μm厚Al靶处的粒子速度、应力和应变率曲线的准等熵段存在较大起伏,应变率曲线在正负值间持续振荡,并且振幅较大。应力云图显示周期调制梯度材料在加载过程中会形成多个波系的追赶、叠加、整合。数值模拟结果显示,当靶材厚度为60μm时,波系完成整合,转变为连续的压缩波。结合数值模拟结果开展了60μm厚Al靶的轻气炮加载实验,粒子速度曲线和应力曲线的准等熵段转变为平滑的加载波形,应变率曲线准等熵段振幅显著减小,实现了良好的准等熵加载效果。研究结果表明,周期调制梯度材料与靶材厚度需进行匹配设计,研究结果可为新型周期调制梯度结构的应用提供指导。
The quasi-isentropic loading technique based on wave impedance gradient materials is a crucial method for understanding the dynamic response characteristics of materials,which is essential for enhancing material service performance.In this study,Ti-Pt periodically modulated gradient materials were successfully prepared using electron beam evaporation deposition technology.By adjusting the thickness of the two components(Ti and Pt single layers)within the periodic layers,a macroscopic gradient in wave impedance was achieved.The total thickness error between the measured gradient material and the theoretical design was only 1.67%,with an average hardness and elastic modulus of 2.8 and 99.8 GPa,respectively.The interfaces between the internal layers of the material were clear,and no metal alloy phases were detected in the phase analysis.The Ti-Pt periodically modulated gradient material was loaded onto a 5μm-thickness Al target by a one-stage light gas gun,generating a shock-quasi-isentropic loading waveform within the Al target.Numerical simulation results showed good agreement in the rising trend with the experimental curve.For the 5μm-thickness Al target,the particle velocity,stress,and strain rate curves exhibit significant fluctuations in the quasi-isentropic stage,with the strain rate curve oscillating continuously between positive and negative values with large amplitudes.Stress contour maps indicate that the loading process of the periodically modulated gradient material involved the chasing,superposition,and integration of multiple wave systems.Simulation shows that when the target thickness is 60μm,the wave systems complete integration and change into continuous compression wave loading.Based on the simulation result,light gas gun loading experiment for the Al target with a thickness of 60μm were conducted.The particle velocity and stress curves in the quasi-isentropic stage change into smooth loading waveforms,and the strain rate curve remains overall positive,achieving a good quasi-isentropic loading.This indicates that the periodically modulated gradient material and target thickness need to be designed to match each other.The results of this study provide a guidance for the application of novel periodically modulated gradient structures.
作者
江宇达
张睿智
吴楯
陈翰
高伟龙
黄子豪
周亦恒
张建
胡建波
罗国强
JIANG Yuda;ZHANG Ruizhi;WU Dun;CHEN Han;GAO Weilong;HUANG Zihao;ZHOU Yiheng;ZHANG Jian;HU Jianbo;LUO Guoqiang(National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,Chinese Academy of Engineering Physics,Mianyang 621999,Sichuan,China;Hubei Technology Innovation Center for Advanced Composites,Wuhan University of Technology,Wuhan 430070,Hubei,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan 430070,Hubei,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2024年第6期162-174,共13页
Chinese Journal of High Pressure Physics
基金
国家重点研发计划(2021YFB3802300)
广东省基础与应用基础研究重大项目(2021B0301030001)
国防科技重点实验室稳定支持科研项目(JCKYS2022212004)。
关键词
Ti-Pt周期调制梯度材料
电子束蒸发镀膜
准等熵加载
波系分析
Ti-Pt periodically modulated gradient material
electron beam evaporation coating
quasiisentropic loading
wave propagation analysis
