Pressure-induced amorphous-to-amorphous reversible transformation in Pr75Al25
Pressure-induced amorphous-to-amorphous reversible transformation in Pr75Al25
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DOI：
10.1063/1.4841035
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发表时间：
2013-12
影响因子：
3.2
通讯作者：
Chuanlong Lin;A. Ahmad;H. Lou;X. D. Wang;Q. Cao;Y. C. Li;J. Liu;T. Hu;D. X. Zhang;J. Jiang
中科院分区：
文献类型：
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作者：
Chuanlong Lin;A. Ahmad;H. Lou;X. D. Wang;Q. Cao;Y. C. Li;J. Liu;T. Hu;D. X. Zhang;J. Jiang
利用高压同步辐射X射线衍射技术原位研究了Pr 75 Al 25金属玻璃（MG）的压力诱导非晶-非晶可逆相变。转变开始于约21 GPa，具有约5%的体积塌陷，并在约35 GPa结束。这种转变是可逆的滞后。基于Ce基金属玻璃和Pr金属的高压行为，我们认为Pr 75 Al 25 MG的压力诱导多晶转变源于Pr金属的4f电子离域，导致键缩短的突变。这些结果为金属玻璃中非晶-非晶相变的机理提供了新的认识，并将引发更多的理论和实验研究。
A pressure-induced amorphous-to-amorphous reversible transformation was revealed in Pr75Al25 metallic glass (MG) using in situ high-pressure synchrotron x-ray diffraction technique. The transition began at about 21 GPa with a ∼ 5% volume collapse and ended at about 35 GPa. This transition is reversible with hysteresis. Based on the high-pressure behaviors of Ce-based metallic glasses and Pr metal here, we suggest that the pressure-induced polyamorphic transition in Pr75Al25 MG stems from 4f-electron delocalization of Pr metal which leads to abrupt change in bond shortening. These results obtained here provide new insights into the underlying mechanism of the amorphous-to-amorphous phase transition in metallic glasses and will trigger more theoretical and experimental investigations for such transition.