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前菌株诱导微结构演变对CoCrNi中合金脆性抵抗的影响
Zening Wang1, Sirui Jing1, Yu Yan1
1Beijing Advanced Innovation Center for Materials Genome Engineering, Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel, Switzerland)
|November 13, 2025
概括
预应力一个等原子的CoCrNi合金增强其对脆化 (HE) 的抗性. 引入更多的脱位和变形双胞胎显著改善了机械性能,并减少了HE引起的损伤.
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.
- 机械工程 机械工程
背景情况:
- 均原子CoCrNi中合金 (MEAs) 在结构应用方面表现有前途.
- 脆化 (HE) 在富含的环境中对金属材料的性能构成重大挑战.
- 在预应变下了解微结构演变对于定制HE电阻至关重要.
研究的目的:
- 为了研究预菌株诱导的微观结构变化对CoCrNi MEA的HE电阻的影响.
- 为了将微观结构特征 (位移,双胞胎) 与机械特性和HE行为相关联.
- 阐明HE电阻增强的基本机制.
主要方法:
- 机械性能测试 (拉力测试) 在变化的前应变水平 (0%,30%,50%).
- 充电和充电后的机械评估,以评估HE.
- 扫描电子显微镜 (SEM) 用于骨折形态分析.
- 电子反射散射衍射 (EBSD) 用于微观结构的表征.
主要成果:
- 在50% (P50) 进行预应力后,出现高密度的位和变形双胞胎.
- 在充电后,P50样本表现出最高的收益强度 (1163.88 MPa) 和最低的延伸损失 (2.74%) .
- SEM分析显示,变形双胞胎有效地减轻了应力度和裂传播,抑制了脆性骨折.
结论:
- 变形双胞胎在改善CoCrNi MEA的脆性抵抗方面发挥着至关重要的作用.
- 通过预应力进行微结构工程,可以显著提高气环境中的材料性能.
- 变形双胞胎影响的运输和分配,有助于改善HE电阻.
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