相关实验视频
Updated: Jul 9, 2025

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
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基于的高度合金的结构稳定性根据颗粒大小和硬度的变化进行评估
Dominika Górniewicz1, Krzysztof Karczewski1, Zbigniew Bojar1
1Faculty of Advanced Technologies and Chemistry, Military University of Technology, Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland.
Materials (Basel, Switzerland)
|December 9, 2023
概括
这项研究研究了高合金的热稳定性,在100小时的回火后发现了结构稳定性. 长时间加热增加了粒径,降低了微硬度,证实了这种先进材料的缓慢扩散.
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.
- 物理化学 物理化学
背景情况:
- 高合金 (HEAs) 由于其多元素组成,具有独特的特性.
- 了解HEAs的热稳定性对于它们在苛刻环境中的应用至关重要.
- 粉末金和U-FAST等先进的烧结技术使复杂的HEA结构能够制造.
研究的目的:
- 分析TiCoCrFeMn高合金的粒度结构和机械性能的热稳定性.
- 为了研究1000°C的长期回火对相位组成,粒度大小和微硬度的影响.
- 为了确定扩散系数,并确认HEAs中的缓慢扩散现象.
主要方法:
- 用U-FAST烧结方法进行粉末金.
- 在气氛中在1000°C的温度下长期回火,长达1000小时.
- 微硬度测量 (维克尔斯方法) 和微结构分析 (颗粒大小评估).
主要成果:
- 该TiCoCrFeMn合金在100小时的回火后达到结构稳定性.
- 稳定的粒度大约为2微米 (BCC) 和0.4微米 (BCC+C14).
- 经过长达1000小时的制,导致颗粒生长 (2.7微米和0.7微米),硬度从1065HV降低到1000HV.
结论:
- 该TiCoCrFeMn合金表现出良好的结构稳定性,在1000°C下长达100小时.
- 长期暴露会导致可预测的微观结构演变和属性变化.
- 确定的扩散系数 (DCr = 1.28 × 10-19 m2·s-1,DTi = 1.04 × 10-19 m2·s-1) 证实了高合金的缓慢扩散特征.
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