高压物理学报2025，Vol.39Issue(12)：10-17,8.DOI:10.11858/gywlxb.20251133
纳米钯在高压下的力学行为
Investigation of Mechanical Behavior in Nanocrystalline Palladium under High Pressure
摘要
Abstract
The investigation of mechanical response characteristics of nanocrystalline metallic materials under extreme high-pressure conditions possesses significant scientific importance and engineering value.Using a diamond anvil cell combined with synchrotron radiation X-ray diffraction techniques,the mechanical behavior of palladium(Pd)with an average grain size of approximately 10 nm under static high pressure was studied.Within the investigated pressure range(0-111 GPa),the crystal structure of palladium remained stable.Analysis of diffraction peak positions and full width at half maximum(FWHM)at each pressure point enables determination of unit cell volume,grain size,and microscopic strain under high-pressure conditions.Fitting with the third-order Birch-Murnaghan equation yields bulk modulus of 288 GPa(hydrostatic)and 290 GPa(non-hydrostatic),and the yield strength is approximately 20 GPa.In addition,by integrating existing literatures,this study systematically explored the influence of size effects on mechanical properties.The yield strength of Pd progressively increases with decreasing grain size,exhibiting a 300%enhancement compared to Pd nanofibers.These findings provide crucial data for the structural design and application of nanocrystalline Pd under extreme conditions.关键词
高压/钯/纳米金属/体弹模量/屈服强度Key words
high pressure/palladium/nanocrystalline metals/bulk modulus/yield strength分类
数理科学引用本文复制引用
刘卜与,刘静仪,庄毓凯,王齐明,张友君..纳米钯在高压下的力学行为[J].高压物理学报,2025,39(12):10-17,8.基金项目
四川省自然科学基金(2023NSFC1910) （2023NSFC1910）
四川大学实验技术立项(SCU2025014) （SCU2025014）
