冷却速率对Zr-2.5Nb中相变的晶体特征的影响
Mikhail L Lobanov1, Valentin Yu Yarkov1,2, Vladimir I Pastukhov1,2
1Heat Treatment & Physics of Metals Department, Ural Federal University, 19 Mira St., 620062 Ekaterinburg, Russia.
Materials (Basel, Switzerland)
|May 27, 2023
概括
研究了对核反应堆至关重要的合金微结构. 研究人员发现了相之间的特定晶体学关系,在不同的冷却条件下揭示了类似的转换机制.
科学领域:
- 材料科学 材料科学 材料科学
- 核工程 核工程是指核工程.
- 金工业是金工业的一个方面.
背景情况:
- (Zr) 合金是核反应堆核心的重要结构材料,因为它们具有卓越的机械性能和耐腐蚀性.
- 在热处理过程中微结构的发展显著影响Zr合金组件在辐射下的性能.
- 了解相位转换是优化Zr合金在苛刻的核环境中的行为的关键.
研究的目的:
- 研究Zr-2.5Nb合金中的 (α + β) 微结构的形态特征.
- 在不同的冷却过程后确定α和β相之间的晶体关系.
- 分析转化机制对微观结构进化的影响.
主要方法:
- 在920°C处理Zr-2.5Nb合金的溶液处理.
- 用水火 (WQ) 和炉冷却 (FC) 来诱导相变.
- 电子反射衍射 (EBSD) 和传输电子显微镜 (TEM) 用于微观结构分析.
主要成果:
- 实验中的α/β误导分布在特定的角度 (0°,29°,35°,43°) 偏离汉堡方向关系 (BOR).
- 结晶学计算证实了基于BOR的β→α→β转换路径的这些偏差.
- 在WQ和FC之后观察到的类似的误导光谱表明类似的转换机制.
结论:
- 该研究阐明了Zr-2.5Nb合金中α和β相之间的晶体关系.
- 水和炉冷却都导致类似的转换机制,涉及剪切和混合.
- 这些发现有助于更深入地了解用于核应用的Zr合金行为.
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