关于两种修改后的Nix-Gao模型的新发现,用于缩尺寸效应
Peina Wang1, Qi Pan2
1Department of Stomatology, Xi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi'an, 710018, Shaanxi, China.
Scientific reports
|March 13, 2025
概括
经过修改的Nix-Gao模型可以描述从下降到上升的缩尺寸效应 (ISE) 的过渡,但由于更深处的脱位主导机制,无法完全捕捉上升的ISE.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 纳米技术纳米技术
背景情况:
- 现有的修改后的Nix-Gao模型准确地描述了下降的缩尺寸效应 (ISE).
- 这些模型对其他IEE类型的适用性,特别是上升的IEE,仍然未被探索.
- 选择了Nix-Gao-Feng和Nix-Gao-Haušild模型是因为它们的用户友好和直接性质.
研究的目的:
- 系统地调查修改后的Nix-Gao模型在描述下降和上升缩尺寸效应 (ISE) 的能力.
- 分析负责观察到的ISE行为和模型预测的潜在机制.
- 评估对各种材料的Nix-Gao-Feng和Nix-Gao-Haušild模型的预测准确度.
主要方法:
- 对两个修改后的Nix-Gao模型进行系统研究:Nix-Gao-Feng和Nix-Gao-Haušild.
- 参数分析,以了解不同深度缩的模型行为.
- 使用确定系数 (DC) 进行定量评估,并与实验数据进行定性比较.
主要成果:
- 尼克斯-加奥-和尼克斯-加奥-豪希尔德模型可以预测从下降到上升ISE的过渡.
- 尼克斯-高-模型还预测了在浅水深处从硬化到软化的硬度过渡.
- 这两种模型都无法完全捕捉上升的ISE,特别是在更深的隙深度,由于过渡到异位主导的下降ISE.
结论:
- 经过修改的Nix-Gao模型在预测ISE过渡方面表现有前途,但在完全捕捉上升的ISE方面存在局限性.
- 在k^3的变化速率和缩深度之间的竞争影响了观察到的IEE转变.
- 仅凭确定系数等定量指标不足以评估这些模型对复杂的ISE现象的完全预测准确性.
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