Effect of La addition on glass-forming ability and stability of mechanically alloyed Zr–Ni amorphous alloys
Effect of La addition on glass-forming ability and stability of mechanically alloyed Zr–Ni amorphous alloys
复制标题
DOI：
10.1016/j.msea.2010.10.092
复制
发表时间：
2011-01
期刊：
影响因子：
6.4
通讯作者：
Y. Wang;Jingfu Wang;C. Li
中科院分区：
文献类型：
--
作者：
Y. Wang;Jingfu Wang;C. Li
在这项研究中，La在Zr 66.7 − xNi 33.3Lax（x=1，3，5at.%）的微观结构演变中的作用，采用X射线衍射（XRD）、透射电子显微镜（TEM）和差示扫描量热仪（DSC）研究了合金在机械合金化过程中的微观结构。结果表明，机械合金化可获得单一的Zr-Ni-La非晶相。微量La的加入改善了Zr-Ni-La合金的非晶形成能力，提高了非晶相对机械诱导晶化的机械稳定性，改变了Zr-Ni合金的晶化模式。此外，Zr-Ni-La非晶相的稳定性随着La含量的进一步增加而降低。Zr_（65.7）Ni_（33.3）La_（11）合金的时效效果最好。此外，La的添加效果相比于小原子尺寸的C添加在促进非晶相的稳定性方面起着更显著的作用。此外，还分别从负混合热、相邻原子间距离和原子尺寸失配三个方面讨论了La的加入对GFA和稳定性影响的原因。
In this study, the role of La in the microstructural evolution of Zr66.7−xNi33.3Lax(x=1, 3, 5at.%) alloys during mechanical alloying has been investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The results show that the single amorphous phase of Zr–Ni–La can be obtained through mechanical alloying. The minor La addition can improve the glass forming ability of Zr–Ni–La, enhance the mechanical stability of the amorphous phase against the mechanically induced crystallization and lead to an altered crystallization mode of Zr–Ni alloy. Moreover, the stability of the Zr–Ni–La amorphous phase decreases with further increasing La content. The best effect is obtained for the Zr65.7Ni33.3La1alloy. Additionally, the effect of La addition in contrast with the small atomic size C addition plays a more significant role in promoting the stability of the amorphous phase. In addition, the reasons of La addition effect on GFA and stability have also been discussed from three factors of negative heat of mixing, distance between neighboring atoms and atomic size mismatch, respectively.