Effect of La on the crystallization behaviour of amorphous Al 94 - x Ni 6La x ( x = 47) alloys
Effect of La on the crystallization behaviour of amorphous Al 94 - x Ni 6La x ( x = 47) alloys
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DOI：
10.1016/j.actamat.2005.04.034
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发表时间：
2005-08
影响因子：
3.6
通讯作者：
K. L. Sahoo;M. Wollgarten;J. Haug;J. Banhart
中科院分区：
文献类型：
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作者：
K. L. Sahoo;M. Wollgarten;J. Haug;J. Banhart
熔体快淬和退火铝合金含6原子% Ni和4- 7at.%采用差示扫描量热仪（DSC）、X射线衍射仪（XRD）、小角中子散射仪（SANS）、透射电子显微镜（TEM）和硬度测试等手段对La进行了研究。XRD研究表明，所有的带是完全无定形的，而SANS表明浓度波动。DSC分析表明，非晶合金在加热过程中经历了两个阶段的晶化过程。结晶途径的细节取决于La浓度。退火后，SANS测量揭示了两种不同的颗粒分布，这可以通过核壳结构或两种不同类型的颗粒来解释。此外，硬度发生显著变化，这归因于微观结构的变化。
Melt spun and annealed Al-alloys containing 6 at.% Ni and 4–7 at.% La were investigated by means of differential scanning calorimetry (DSC), X-ray diffractometry (XRD), small angle neutron scattering (SANS), transmission electron microscopy and hardness measurements. XRD studies revealed that all the ribbons were fully amorphous, whereas SANS indicated concentration fluctuations. DSC showed that the amorphous alloys undergo a two-stage crystallization process upon heating. The details of the crystallization pathway depend on the La concentration. Upon annealing, SANS measurements revealed two different distributions of particles which can be explained by a core shell structure or two different types of particles. Moreover, significant changes in hardness occur which are attributed to changes in microstructure.