双结构复合材料的无损拉伸柔性通过相互扩散和自我组织的战略
Lei Liu1, Shufeng Li1,2, Deng Pan1,3
1School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China.
概括
研究人员开发了双结构矩阵复合材料 (TMC),克服了强度-柔性权衡. 这种新的方法提高了强度,同时保持了出色的柔性,为金属材料提供了显著的进步.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 复合材料 复合材料 复合材料
背景情况:
- 分散增强的金属材料往往会牺牲柔性以获得强度,原因是金属和陶颗粒之间的变形协调不佳.
- 矩阵复合材料 (TMC) 是有前途的,但在平衡机械性能方面面临挑战.
研究的目的:
- 开发双结构TMC,实现增强强度和高可塑性,解决固有的强度-可塑性权衡.
- 研究微观结构,变形机制和新型TMC中的机械性质之间的关系.
主要方法:
- 利用基于粉末金的相互扩散和自我组织策略.
- 设计了一种双结构,包括一个具有细粒度的TiB胡须丰富区域和一个带有三维微小颗粒架构 (3D-MPA) 增强的TiBw-lean矩阵.
主要成果:
- 实现了12.0%的延长,相当于矩阵Ti6Al4V合金,与同质结构复合材料相比强度提高.
- 双重结构呈现异质的粒度分布 (5.8微米细粒,42.3微米粗粒),导致异形变形诱导硬化 (HDI) 和5.8%的柔性.
- 3D-MPA增强剂显示出11.1%的同位素变形性和66%的位移存储,有助于无损的柔性.
结论:
- 开发的双结构TMC成功解决了强度-柔性困境.
- 新的粉末金方法使先进的金属矩阵复合材料能够具有定制的异构结构和增强配置.
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