Synthesis of a bulk nanostructured metastable Al alloy with extreme supersaturation of Mg
Synthesis of a bulk nanostructured metastable Al alloy with extreme supersaturation of Mg
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DOI：
10.1038/s41598-019-53614-3
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发表时间：
2019-11
影响因子：
4.6
通讯作者：
Jae-Kyung Han;K. Liss;T. Langdon;M. Kawasaki
中科院分区：
文献类型：
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作者：
Jae-Kyung Han;K. Liss;T. Langdon;M. Kawasaki
随着剧烈塑性变形（SPD）技术的发展，块体金属的纳米结构化已被广泛应用于提高工程材料的物理和机械性能。通过高压扭转（HPT），这是最初开发的晶粒细化技术，最近扩展到机械键合的异种金属在nanostrcturing通常涉及显着的微观结构的异质性。在这里，我们介绍，为第一次，大块亚稳Al-Mg过饱和固溶体的扩散连接单独的Al和Mg金属固体在室温下使用HPT。在整个亚稳合金中均匀地实现了优异的硬度，记录的最大过饱和Mg含量为~ 38.5at.%在Al基体中具有约35-40 nm的晶粒尺寸。我们的研究结果表明，在室温下，这样的散装固体尚未报道的机械合金粉末冶金具有良好的微观结构稳定性的散装纳米晶亚稳合金的合成。
Nanostructuring of bulk metals is now well documented with the development of severe plastic deformation (SPD) for improving the physical and mechanical properties of engineering materials. Processing by high-pressure torsion (HPT), which was developed initially as a grain refinement technique, was extended recently to the mechanical bonding of dissimilar metals during nanostrcturing which generally involves significant microstructural heterogeneity. Here we introduce, for the first time, a bulk metastable Al-Mg supersaturated solid solution by the diffusion bonding of separate Al and Mg metal solids at room temperature using HPT. Exceptional hardness was achieved homogeneously throughout the metastable alloy with a record maximum supersaturated Mg content of ~38.5 at.% in the Al matrix having a grain size of ~35–40 nm. Our results demonstrate the synthesis of a bulk nanocrystalline metastable alloy with good microstructural stability at room temperature where such bulk solids are not yet reported for mechanical alloying by powder metallurgy.