纳米钯在高压下的力学行为

刘卜与; 刘静仪; 庄毓凯; 王齐明; 张友君

doi:10.11858/gywlxb.20251133

纳米钯在高压下的力学行为

doi: 10.11858/gywlxb.20251133

四川大学原子与分子物理研究所, 四川成都　610065

基金项目: 四川省自然科学基金（2023NSFC1910）；四川大学实验技术立项（SCU2025014）

详细信息

作者简介:
刘卜与（2004－），男，本科，主要从事高压下材料的力学性质、微观结构及相变研究. E-mail：2022141220285@stu.scu.edu.cn

通讯作者:
王齐明（1985－），女，博士，助理研究员，主要从事高压下纳米材料的结构和性质研究. E-mail：qmwang@scu.edu.cn

中图分类号: O521.2
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出版历程
- 收稿日期: 2025-07-17
- 修回日期: 2025-09-15
- 网络出版日期: 2025-09-17
- 刊出日期: 2025-12-05

Investigation of Mechanical Behavior in Nanocrystalline Palladium under High Pressure

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, China

摘要

摘要: 极端高压环境下纳米金属材料的力学响应特性研究具有重要的科学意义和工程价值。采用金刚石压砧结合同步辐射X射线衍射技术，研究了平均晶粒尺寸约为10 nm的金属钯（Pd）在静高压下的力学行为。在0～111 GPa压力范围内，钯金属的相结构稳定。通过分析不同压力下X射线衍射谱的峰位和半高宽等，得到了纳米金属钯在高压下的晶胞体积、晶粒尺寸和微应变等信息。通过拟合三阶Birch-Murnaghan方程，得到了纳米钯金属在静水压和非静水压下的体弹模量分别为288和290 GPa，屈服强度约为20 GPa。结合已有报道，探讨了尺寸效应对金属材料体弹模量等力学行为的影响规律。随着晶粒尺寸的减小，钯金属的屈服强度逐渐增大，较钯纳米纤维材料提高了约300%。实验结果可为纳米金属钯在极端条件下的结构设计与应用提供数据参考。
- 高压 /
- 钯 /
- 纳米金属 /
- 体弹模量 /
- 屈服强度
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.
- high pressure /
- palladium /
- nanocrystalline metals /
- bulk modulus /
- yield strength

HTML全文

图 1 10 nm钯样品的TEM图像(a)～(b)、尺寸分布(c)以及XRD谱(d)

Figure 1. TEM images (a)−(b), grain size distribution (c), XRD pattern (d) for 10 nm-grained Pd

下载: 全尺寸图片幻灯片

图 2 静水压(a)和非静水压(b)下10 nm钯的原位XRD谱

Figure 2. In situ XRD images of 10 nm-grained Pd under hydrostatic (a) and non-hydrostatic (b) pressure

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图 3 静水压与非静水压下钯的晶面间距随压力的变化

Figure 3. d-spacing of Pd under hydrostatic and non-hydrostatic pressure

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图 4 钯的晶胞体积压缩率随压力的变化（实心点为本研究数据点，空心点为其他研究的块体材料数据点，实线和虚线为本研究和文献通过三阶Birch-Murnaghan状态方程拟合的曲线）^{[9, 30–32]}

Figure 4. Pressure-dependent evolution of unit cell volume compression ratio (V/V₀) for palladium (Solid symbols denote experimental data from this study; open symbols represent bulk material data from other research; solid and dashed curves correspond to third-order Birch-Murnaghan equation of state fittings from this work and literature, respectively.)^{[9, 30–32]}

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图 5 非静水压下钯样品的(111)、(200)、(220)晶面XRD峰的FWHM随压力的变化

Figure 5. Pressure-dependent FWHM of (111), (200), and (220) XRD peaks for palladium under non-hydrostatic pressure

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图 6 10 nm钯的微区偏应力随压力的变化

Figure 6. Deviatoric stress-pressure response of 10 nm Pd under compression

下载: 全尺寸图片幻灯片

表 1 不同晶粒尺寸下钯的体弹模量^{[9, 30–32]}

Table 1. Bulk modulus of palladium at varying grain sizes^{[9, 30–32]}

Grain size	Pressure/GPa	B₀/GPa	$ {B}'_{0} $	Pressure retransmitting medium	Ref.	Remark
10 nm	0–67.1	288(5)	2.76(24)	Argon	This study	None
10 nm	0–111	290(14)	3.87(47)	None	This study	None
33 nm	Tensile response	290	None	None	Ref. [33]	Nanowhisker
100 nm	Tensile response	120	None	None	Ref. [33]	Nanowhisker
Bulk	0–80	190(3)	5.30(20)	None	Ref. [9]	None
Bulk	0–200	197(3)	4.99 (6)	Neon	Ref. [32]	None
Theory	Theory	195(3)	5.10(10)	None	Ref. [9]	Theory
Theory	Theory	184	5.38	None	Ref. [34]	Theory
Bulk	0–30	157(3)	9.90(40)	Neon gas	Ref. [30]	None

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