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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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超低温对Ni-Co基超合金薄板在微拉伸变形过程中的机械性能和微结构演变的影响
Qiang Zhu1,2, Min Wang1, Yuying Sun1
1School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China.
Materials (Basel, Switzerland)
|November 14, 2023
概括
基于Ni-Co的超级合金的微成型显示出随着样品厚度的降低,由于表面粗和阻碍脱位运动,强度和可塑性降低. 这些尺寸效应对于航空航天和核应用中的微组件设计至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 金工业是金工业的一个方面.
背景情况:
- 基于- (Ni-Co) 的超级合金对于航空航天和核工业的微组件至关重要,因为它们具有出色的性能.
- 产品微型化需要了解这些超级合金在微尺度上的行为,其中尺寸效应显著影响机械性能.
研究的目的:
- 研究初始微观结构和变形温度对基于Ni-Co的超合金薄板的机械行为的影响.
- 分析尺寸效应,特别是样品厚度与颗粒大小 (t/d) 的比率,对抗拉强度,屈服强度和延长的影响.
主要方法:
- 在室温和超低温下对基于Ni-Co的超合金薄板进行微拉伸实验.
- 将样品厚度与粒度大小比率 (t/d) 从8.6降至2.4以观察机械反应的变化.
- 在不同的温度和尺寸条件下测量了拉伸强度,屈服强度,延长和表面粗度.
主要成果:
- 从8.6降低到2.4的t/d比导致拉伸强度降低 (在室温下1221到1090MPa;在超低温下1458到1132MPa) 和屈服强度降低 (在室温下793到622MPa;在超低温下917到730MPa).
- 较小的t/d比率 (0.26到0.21在室温下;0.31到0.28在超低温下) 的延长也减少了.
- 表面粗度随着t/d的减少而增加,这表明微型成型过程中的表面影响很大.
结论:
- 尺寸效应,以t/d比为特征,显著降低了基于Ni-Co的超合金薄板的机械性能.
- 表面粗和阻碍谷物边界的脱位运动有助于微变形超级合金的应变局部化和过早断裂.
- 了解这些现象对于可靠的设计和制造由Ni-Co基超级合金制成的微组件至关重要.
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