热温度对CoCrFeNiNbb的微观结构和机械性能的影响
Rui Fan1,2,3,4,5, Sicong Zhao1,3, Liping Wang1,3
1School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China.
Materials (Basel, Switzerland)
|June 10, 2023
概括
化CoCrFeNiNb0.2Mo0.2高合金形成了Cr2Nb纳米沉积物,显著提高了机械性能. 在700°C达到最佳强度,证明了加强面中心立方合金的新方法.
科学领域:
- 材料科学 材料科学 材料科学
- 金工程 金工程 金工程
背景情况:
- 面中心立方 (FCC) 结构的高合金 (HEAs) 正在为其潜在的应用获得研究兴趣.
- 将FCC CoCrFeNi HEAs与 (Nb) 和 (Mo) 等元素合金化是一种已知的强化策略.
研究的目的:
- 为了进一步提高含有Nb和Mo的CoCrFeNiHEAs的机械强度.
- 研究化处理对CoCrFeNiNb0.2Mo0.2.2.的微观结构和特性的影响.
主要方法:
- 在24小时内在不同温度下对CoCrFeNiNb0.2Mo0.2合金进行化处理.
- 微观结构的表征,以确定沉物的形成和结构.
- 机械性能测试 (收益强度,最终抗拉强度,延长) 和断裂分析.
主要成果:
- 形成一种新型的Cr2Nb型纳米级沉物,具有六角密封 (HCP) 结构.
- Cr2Nb沉物与FCC矩阵是半连贯的.
- 通过调整回火温度来定制沉物数量和大小,在700°C时获得最佳结果.
- 达到727MPa的强度,最终的抗拉强度为1.05GPa,在700°C时的延长率为8.38%.
- 观察到的骨折模式是裂纹和性骨折的混合体.
结论:
- 化处理有效地诱导在CoCrFeNiNb0.2Mo0.2 HEA中形成有益的Cr2Nb纳米沉物.
- 该研究为通过受控回火和沉工程加强FCC高合金提供了理论基础.
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