合金元素对多元件 γ'-L12合金的高温屈服行为的影响
Chen-Yuan Wang1, Sae Matsunaga1, Yoshiaki Toda2
1Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi 277-8561, Chiba, Japan.
Materials (Basel, Switzerland)
|May 25, 2024
概括
该研究表明,跨滑强化对于基高合金的高温强度至关重要. 与Ti和Nb合金相结合,显著提高了产量强度,特别是在高温下.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是一种金工业.
- 机械工程 机械工程
背景情况:
- 基于的高合金 (基于Ni的HEAs) 由于在无序矩阵中有序的L12 (γ') 沉而表现出出色的机械性能.
- 这些合金中个别增强机制的确切贡献尚不清楚,使合金设计复杂化.
研究的目的:
- 系统地研究多元件L12排序单相合金中的强化机制.
- 评估合金元素 (Co,Cr,Ti,Nb) 对基于Ni的HEAs高温机械性能的影响.
主要方法:
- 利用CALPHAD热力学计算来设计单相L12合金.
- 执行微结构特性和相位识别以确认合金结构.
- 在NiCoCrAl,NiCoCrAlTi和NiCoCrAlNb合金上进行了高温压缩试验 (500°C1000°C).
主要成果:
- 证实了开发的合金中g'单相的存在.
- 在研究的合金中观察到强度对温度的积极依赖,直到峰值温度.
- 证明Ti和Nb的添加显著提高了高温收成强度.
- 通过考虑固体溶液,粒度边界,顺序和交叉滑动强化来建模出产强度.
结论:
- 交叉滑动诱导的强化被确定为这些基于Ni的HEAs中高温强度增强的主要贡献者.
- 与Ti和Nb合金提供了一个有前途的途径,以提高这些材料的高温性能.
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