Andrea Farkas , Gergely Farkas , Patrik Dobroň , Jozef Veselý , Shin-ichi Inoue , Yoshihito Kawamura , Kristián Máthis , Daria Drozdenko
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引用次数: 0
摘要
通过扫描和透射电子显微镜研究了从铸锭采用传统挤压（CE）法和快速凝固（RS）带状固结法制备的镁-0.9%锌-2.05%钇-0.15%铝（at.%）合金微观结构的热稳定性。结果表明，在初始状态下，虽然两种合金的微观结构都由小的再结晶晶粒和大的非再结晶晶粒组成，但溶质富集相的分布和形态受加工路线的影响很大。特别是，RS 合金主要包含细小均匀分布的团簇排列纳米板（CANaPs），而 CE 合金的特点是较大的溶质富集相（包括 CANaPs 和 LPSO 部分）以及单个团簇排列层（CALs）和/或薄 CANaPs。溶质富集相的大小和分布差异自然会影响后加工热处理期间的再结晶动力学。尽管如此，这两种材料在高达 300 °C 的温度下都表现出了极高的热稳定性，大大超过了传统镁合金体系的热稳定性值。
Microstructure and thermal stability of MgZnYAl alloy containing cluster-arranged nanoplates (CANaPs)
The thermal stability of the microstructure of Mg - 0.9 % Zn - 2.05 % Y - 0.15 % Al (at.%) alloy prepared by conventional extrusion (CE) from cast ingot and rapidly solidified (RS) ribbon consolidation method has been investigated by scanning and transmission electron microscopy. It is shown that in the initial state, although both microstructures consist of small recrystallized and large non-recrystallized grains, the distribution and morphology of the solute-enriched phases are strongly influenced by the processing route. Particularly, the RS alloy mainly contains fine homogeneously distributed cluster-arranged nanoplates (CANaPs), while the CE alloy is characterized by larger solute-enriched phases (incl. CANaPs and LPSO fractions) together with individual cluster-arranged layers (CALs) and/or thin CANaPs. Differences in the size and distribution of solute-enriched phases naturally affect the recrystallization dynamics during post-processing heat treatment. Nevertheless, both types of material exhibited exceptionally high thermal stability up to 300 °C, which significantly exceeds the values reported for conventional Mg alloy systems.
期刊介绍：
Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials.
The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal.
The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include:
Metals & Alloys
Ceramics
Nanomaterials
Biomedical materials
Optical materials
Composites
Natural Materials.
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