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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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材料梯度可提高格子结构的强度和应变硬化
Junhao Ding1,2, Yaojie Wen1, Qianhua Wang1
1Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 8, 2025
概括
研究人员创建了具有材料梯度的建筑格子,增强了机械性能. 这一创新允许可编程变形和改善格子结构的能量吸收.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 按照几何设计设计的传统建筑格子在适应性和结构冗余性方面存在局限性.
- 定制格子的机械反应对于先进的材料应用至关重要.
研究的目的:
- 将空间连续的材料梯度引入体中心立方 (BCC) 和Gyroid三次周期最小表面 (TPMS) 格子中.
- 研究材料梯度对建筑格子的机械行为和崩机制的影响.
- 通过材料分布来证明可编程变形,将其与几何设计脱.
主要方法:
- 使用定制的激光粉床融合平台来控制合金组成.
- 制造的BCC和Gyroid TPMS格子具有连续的材料梯度.
- 进行压缩实验,分析机械反应和故障模式.
主要成果:
- 连续的材料梯度重新配置了格子崩机制,引导一个稳定的塑料前面从软到硬的区域.
- 提高结构性能,在BCC格子中增加高原应力和能量吸收,达到23.6%和25.4%,在Gyroid结构中达到9.8%和12%.
- 由于抑制局部化和稳定塑料流量,在宏观尺度上实现了新兴的应变硬化行为.
结论:
- 材料梯度为元材料提供了强大的设计策略,超越了被动形状优化.
- 空间连续的材料梯度使建筑格子中的主动,构成驱动的性能控制成为可能.
- 这种方法提高了格子材料的结构性能和适应性.
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