构成和结构控制,以提高内粒前应力并释放FGH99扩散结合超级合金的晶格间应力
Xiaolong Hong1, Zhiwei Qin1, Xin Jiang1
1School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, PR China. donghg@dlut.edu.cn.
Materials horizons
|December 5, 2025
概括
研究人员开发了一种新的方法,通过控制其内部结构来加强基于的超级合金. 这种技术增强了预应力和格子扭曲,显著提高了高温应用的扩散结合接头的剪切强度.
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.
- 固态化学 固态化学
背景情况:
- 基于的高级超级合金对于高温应用至关重要.
- 扩散结合是连接这些合金的关键技术,但达到优越的强度仍然是一个挑战.
- 开发具有不同区域的多层次层次异构结构是材料科学的前沿.
研究的目的:
- 提出一种组成和结构控制策略,以增强基超级合金中的前应力和晶格扭曲.
- 为了研究 (Cr) 含量对格子扭曲和格子间应变释放的影响.
- 为了提高基超级合金中扩散键接头的剪切强度.
主要方法:
- 使用集群加原子模型来定制Cr含量以适应晶格扭曲.
- 在粗粒中形成预组装的脱位网络,以促进固体溶液的强化.
- 采用第一原则计算来分析界面结合和分离趋势.
主要成果:
- 在1100°C达到857.7MPa的剪切强度,用于FGH99扩散结合接头.
- 证明Cr doping可以提高Ni3Al/Ni的界面粘合强度,达到4.62 J m−2.2.
- 表明沉物/矩阵接口的结构连贯性释放了晶格间的应变,并限制了晶格参数变化.
结论:
- 拟议的策略有效地增加了内粒前应力,并通过引入Cr来控制格子扭曲.
- 使用定制接口构建异构结构可以增强扩散键基超合金的机械性能.
- 这种方法为加入高性能基超级合金提供了新的可能性.
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