Structural characterisation and stability of new nanoquasicrystalline Al-based alloys
Structural characterisation and stability of new nanoquasicrystalline Al-based alloys
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新型纳米准晶铝基合金的结构表征及稳定性
DOI：
10.1016/j.msea.2003.10.066
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发表时间：
2004
期刊：
影响因子：
6.4
通讯作者：
I. Stone
中科院分区：
文献类型：
--
作者：
M. Galano;F. Audebert;B. Cantor;I. Stone
纳米准晶铝基合金由于其优异的力学性能而成为近十年来研究的热点。近年来，四元纳米准晶合金的热稳定性和高温力学性能得到了改善。研究了四元合金Al_（93）Fe_（3Cr）Z_2（at.%）(with Z=Ti，V，Nb，Ta）和三元Al 93（Fe 3Cr 2）7合金。通过X射线衍射（XRD）和透射电子显微镜（TEM）对其结构进行了表征，并通过差示扫描量热法（DSC）研究了准晶相的热稳定性和分解。所有合金的显微组织均为球形二十面体颗粒镶嵌在α-Al基体中。第四组分产生了二十面体粒度的显著细化。四元合金的分解，观察到在更高的温度比三元合金具有广泛的放热峰。含有Nb和Ta的新合金显示出多峰转变过程，延伸到熔融开始。在550°C下热处理后观察到含有Ta或Nb的二十面体颗粒。
Nanoquasicrystalline Al-based alloys have been studied intensively for the last decade because of their promising mechanical properties. Recently quaternary nanoquasicrystalline alloys with improved thermal stability and better mechanical properties at elevated temperature have been reported. The present work describes an investigation into quaternary Al93Fe3Cr2Z2(at.%) (with Z=Ti, V, Nb, Ta) and ternary Al93(Fe3Cr2)7, produced by melt spinning. Structural characterisation was carried out by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the thermal stability and decomposition of the quasicrystalline phase were studied by means of differential scanning calorimetry (DSC). All of the alloys showed a microstructure consisting of spherical icosahedral particles embedded in an α-Al matrix. The fourth component produced a significant refinement of icosahedral particle size. The decomposition of the quaternary alloys was observed at higher temperatures than for the ternary alloy with a broad exothermic peak. The new alloys containing Nb and Ta showed a multimodal transformation process extending up to the onset of melting. Icosahedral particles containing Ta or Nb were observed after heat treatment at 550°C.