Thermal stability of nanocrystalline Fe–Cr alloys with Zr additions
Thermal stability of nanocrystalline Fe–Cr alloys with Zr additions
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DOI：
10.1016/j.msea.2012.07.045
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发表时间：
2012-10
期刊：
影响因子：
6.4
通讯作者：
M. Saber;H. Kotan;C. Koch;R. Scattergood
中科院分区：
文献类型：
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作者：
M. Saber;H. Kotan;C. Koch;R. Scattergood
本工作的主要目的是确定1-4at%的Zr添加剂对机械合金化的纳米晶Fe-Cr合金（含10和18at%的Cr）的热稳定性的影响。报告了在高达1000°C的等时退火处理条件下，基于XRD的晶粒尺寸以及显微硬度变化的沿着。微观结构的调查，使用光学显微镜，沟道对比FIB成像，和TEM。通过添加2at%的Zr，在纳米尺度范围内的晶粒尺寸稳定性保持到900°C。纳米级金属间化合物颗粒的动力学钉扎被认为是高温晶粒尺寸稳定化的一个来源。除了Hall-Petch效应之外，金属间化合物颗粒也有助于强化。显微硬度，XRD数据，并从Fe-10at%Cr与2at%Zr的TEM图像的测量值的分析表明，热力学和动力学机制将有助于晶粒尺寸稳定。10和18at%Cr合金的结果无显著差异，表明α→γ相变不影响晶粒尺寸的稳定化。
The primary objective of this work was to determine the influence of 1–4at% Zr additions on the thermal stability of mechanically alloyed nanocrystalline Fe–Cr alloys containing 10 and 18at% Cr. Grain sizes based on XRD, along with microhardness changes, are reported for isochronal annealing treatments up to 1000°C. Microstructure investigations were done using optical microscopy, channeling contrast FIB imaging, and TEM. Grain size stabilization in the nanaoscale range was maintained up to 900°C by adding 2at% Zr. Kinetic pinning by nanoscale intermetallic particles was identified as one source of high temperature grain size stabilization. Intermetallic particles also contribute to strengthening in addition to the Hall–Petch effect. The analysis of microhardness, XRD data, and measured values from the TEM image for Fe-10at% Cr with 2at% Zr suggested that both thermodynamic and kinetic mechanisms would contribute to grain size stabilization. There was no significant difference in the results for the 10 and 18at% Cr alloys, which indicates that the α→γ transformation does not influence the grain size stabilization.