Microstructural and mechanical characterisation of Fe-14Cr-0.22Hf alloy fabricated by spark plasma sintering
Microstructural and mechanical characterisation of Fe-14Cr-0.22Hf alloy fabricated by spark plasma sintering
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DOI：
10.1016/j.jallcom.2018.05.196
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发表时间：
2018-09
影响因子：
6.2
通讯作者：
M. Auger;Yina Huang;Hongtao Zhang;C. A. Jones;Z. Hong;M. Moody;S. Roberts;P. Grant
中科院分区：
文献类型：
--
作者：
M. Auger;Yina Huang;Hongtao Zhang;C. A. Jones;Z. Hong;M. Moody;S. Roberts;P. Grant
将Fe-14Cr预合金粉末和纯Hf粉末进行机械合金化，得到名义成分为Fe-14Cr-0.22Hf （wt. %）的粉末，并通过火花等离子烧结（SPS）技术进行固结，以研究Hf在铁素体基体中产生纳米级氧化物颗粒分散的能力。利用电子显微镜、x射线衍射、原子探针断层扫描和压痕技术对研磨后的粉末和固结材料进行了全面的微观结构和力学表征。结果表明，Hf的加入可以通过内部氧化有效地使Hf- o纳米颗粒在固结材料中形成细尺度的分散。合金中产生了均匀的晶粒组织。虽然纳米颗粒在最细尺度上分散不均匀，但分散强化对硬度有显著的贡献。根据这些结果，活性元素的内部氧化而不是直接添加氧化物可能为氧化物分散强化钢的设计和开发提供额外的机会。
Fe-14Cr pre-alloyed powder and pure Hf powder were mechanically alloyed to produce powder with nominal composition Fe-14Cr-0.22Hf (wt. %) that was consolidated by the spark plasma sintering (SPS) technique in order to investigate the ability of Hf to produce a nanometric dispersion of oxide particles in a ferritic matrix. Comprehensive microstructural and mechanical characterisation of the as-milled powder and the consolidated material was performed using electron microscopy, X-ray diffraction, atom probe tomography and indentation techniques. It was shown that Hf additions can effectively produce, by internal oxidation, a fine scale dispersion of Hf-O nanoparticles in the consolidated material. A uniform grain structure was produced in the alloy. Although the nanoparticle dispersion was not homogeneous at the finest scale, the resulting dispersion strengthening contributed significantly to the hardness. According to these results, internal oxidation of reactive elements rather than direct addition of oxides may offer additional opportunities in the design and development of oxide dispersion strengthened steels.