Crystallization Process and Microstructural Evolution of Melt Spun Al-RE-Ni-(Cu) Ribbons
Crystallization Process and Microstructural Evolution of Melt Spun Al-RE-Ni-(Cu) Ribbons
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DOI：
10.3390/met10040443
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发表时间：
2020-03
期刊：
影响因子：
2.9
通讯作者：
F. G. Cuevas;Sergio Gamaliel Perez;Rosa María Aranda Louvier;R. López
中科院分区：
文献类型：
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作者：
F. G. Cuevas;Sergio Gamaliel Perez;Rosa María Aranda Louvier;R. López
本文研究了Al_（88）-RE_（4）-Ni_（8）（RE = Y，Sm和Ce）非晶合金晶化初期和晶化后期的晶化过程。此外，添加1原子%的研究了Cu替代Ni或Al。用差示扫描量热法研究了熔纺薄带中非晶结构的稳定性，Ce合金是最稳定的。用透射电镜分析了Cu对一次晶化过程中晶粒尺寸的影响。后一种技术和X射线衍射显示在较高温度下形成金属间相。对于Ce合金，观察到明显的差异，具有涉及Al 3 Ni和Al 11 Ce 3的存在的更简单的序列。然而，对于Y和Sm合金，更复杂的演变涉及亚稳三元相之前，Al 19 RE 5 Ni 3出现，发生。金属间化合物的形状从Ce合金中的等轴变化为Y和Sm的伸长，Sm的颗粒更长，并且一般来说，当Cu被添加到合金中时。
The crystallization process, both at the initial and subsequent stages, of amorphous Al88-RE4-Ni8 alloys (RE = Y, Sm and Ce) has been studied. Additionally, the consequences of adding 1 at.% Cu replacing Ni or Al were studied. The stability of the amorphous structure in melt spun ribbons was thermally studied by differential scanning calorimetry, with Ce alloys being the most stable. The effect of Cu to reduce the nanocrystal size during primary crystallization was analyzed by transmission electron microscopy. This latter technique and x-ray diffraction showed the formation of intermetallic phases at higher temperatures. A clear difference was observed for the Ce alloy, with a simpler sequence involving the presence of Al3Ni and Al11Ce3. However, for the Y and Sm alloys, a more complex evolution involving metastable ternary phases before Al19RE5Ni3 appears, takes place. The shape of the intermetallics changes from equiaxial in the Ce alloys to elongate for Y and Sm, with longer particles for Sm and, in general, when Cu is added to the alloy.