Shock Synthesis of Decagonal Quasicrystals.

Shock Synthesis of Decagonal Quasicrystals.
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DOI:
10.1038/s41598-017-15229-4
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发表时间:
2017-11-15
期刊:
影响因子:
4.6
通讯作者:
Asimow PD
Asimow PD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Oppenheim J;Ma C;Hu J;Bindi L;Steinhardt PJ;Asimow PD

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Khatyrka陨石含有二十面体和十面体准晶体。在我们之前的研究中,我们已经在CuAl5和304不锈钢合金的界面上合成了二十面体准晶体,并通过冲击实验恢复了这些准晶体。在这项研究中,我们报道了一种新的冲击恢复实验,旨在合成类似于十立方石的十立方准晶体,天然Al71Ni24Fe5。2024铝和80坡莫合金堆叠在一起,在304不锈钢回收室中进行冲击。在恢复的Al - permalalloy界面上发现了大量平均成分为Al73Ni19Fe4Cu2Mg0.6Mo0.4Mn0.3的十方准晶,其中含有微量的Si和Cr。实验还合成了具有B2 (cscl型)结构和亚稳Al9Ni2相的AlNiFe合金。我们介绍了回收相的化学(扫描电子显微镜和电子探针)和结构(电子背散射衍射和透射电子显微镜)表征,并讨论了这种激波合成对高压冲击期间准晶体稳定性的影响,以及对在Khatyrka发现的相组合的解释。
The Khatyrka meteorite contains both icosahedral and decagonal quasicrystals. In our previous studies, icosahedral quasicrystals have been synthesized and recovered from shock experiments at the interface between CuAl5 and stainless steel 304 alloys. In this study, we report a new shock recovery experiment aimed at synthesizing decagonal quasicrystals similar to decagonite, natural Al71Ni24Fe5. Aluminum 2024 and permalloy 80 alloys were stacked together and shocked in a stainless steel 304 recovery chamber. Abundant decagonal quasicrystals of average composition Al73Ni19Fe4Cu2Mg0.6Mo0.4Mn0.3 with traces of Si and Cr were found along the recovered interface between the Al and permalloy. The experiment also synthesized AlNiFe alloy with the B2 (CsCl-type) structure and the metastable Al9Ni2 phase. We present chemical (scanning electron microscopy and electron microprobe) and structural (electron backscatter diffraction and transmission electron microscopy) characterization of the recovered phases and discuss the implications of this shock synthesis for the stability of quasicrystals during high-pressure shocks and for the interpretation of the phase assemblage found in Khatyrka.
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