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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Evolution of strain-induced hafnium carbides in a molybdenum base Mo-Hf-C alloy studied by small-angle neutron scattering and complementary methods
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Evolution of strain-induced hafnium carbides in a molybdenum base Mo-Hf-C alloy studied by small-angle neutron scattering and complementary methods

机译：小角度中子散射和互补法研究钼基Mo-Hf-C合金中应变诱导碳化ha的演化

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摘要

The powder metallurgically processed molybdenum base alloy MHC (Mo-Hf-C), with a nominal content of 0.65 at.% Hf and 0.65 at.% C, is of considerable interest for high temperature applications. After uniaxial deformation and subsequent aging of the as-sintered material, plate-like, nm-sized hafnium carbides are formed by heterogeneous nucleation at dislocations. The main focus of this work was to study the evolution of the size distribution of these small hafnium carbides and to gain statistically reliable data from a large volume regarding the morphology and the volume fractions using small-angle neutron scattering (SANS) experiments for samples aged at 1600 degrees C for different times. Additionally, complementary methods were used to support the SANS results. Hardness testing, two-stage interrupted compression tests, optical light microscopy, electron backscatter diffraction, scanning and transmission electron microscopy were used for further characterization of the aged MHC microstructures and as complementary methods to the SANS measurements. The small-angle neutron scattering investigations revealed anisotropic 2D patterns in relation to the loading direction of the deformed samples which were assigned to not fully compressed pores. It was possible to analyze the thickness distribution of the fine hafnium carbides due to streak formation of the scattering patterns caused by an orientation relationship between face centered cubic hafnium carbides and the body centered cubic molybdenum matrix. The evolution of the microstructure and hardness are in good agreement with the results of the small-angle neutron scattering measurements. The highest hardness was revealed after aging for 1 min at 1600 degrees C exhibiting small hafnium carbides with a mean diameter of similar to 13 nm, a mean plate-thickness of similar to 3 nm and a volume fraction of 0.05 vol%. Although, the volume fraction of these carbides was increasing with progressing aging time the hardness dropped due to recovery, recrystallization as well as increasing particle size. (C) 2016 Elsevier B.V. All rights reserved.
机译：粉末冶金处理的钼基合金MHC（Mo-Hf-C）的标称含量为Hf的0.65 at。％和C的0.65 at。％，是高温应用中相当感兴趣的。在烧结后的材料进行单轴变形并随后老化之后，通过位错的异质形核形成了板状，纳米级的碳化ha。这项工作的主要重点是研究这些小ha碳化物的尺寸分布演变，并使用小角度中子散射（SANS）实验从大体积中获得有关形态和体积分数的大体积统计可靠数据。在1600摄氏度下不同的时间。此外，还使用补充方法来支持SANS结果。硬度测试，两阶段间断压缩测试，光学显微镜，电子反向散射衍射，扫描和透射电子显微镜被用于进一步表征老化的MHC微观结构，并作为SANS测量的补充方法。小角度中子散射研究揭示了与变形样品的加载方向相关的各向异性二维图形，这些变形样品分配给未完全压缩的孔。可以分析由于面心立方碳化ha与体心立方钼基体之间的取向关系引起的散射图案条纹形成而导致的细碳化f的厚度分布。微观结构和硬度的变化与小角度中子散射测量的结果非常吻合。在1600℃老化1分钟后，显示出最高的硬度，显示出小的碳化ha，平均直径类似于13 nm，平均板厚类似于3 nm，体积分数为0.05 vol％。尽管这些碳化物的体积分数随着时效时间的延长而增加，但由于回收，重结晶以及粒度增加，硬度降低。 （C）2016 Elsevier B.V.保留所有权利。

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