Deo L P, Kaufman M J, Wang B, Nikodemski S, DE Oliveira M F
Materials Engineering, Engineering Department, Federal University of Lavras, Lavras, Minas Gerais, Brazil.
Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado, U.S.A.
J Microsc. 2017 Jul;267(1):49-56. doi: 10.1111/jmi.12546. Epub 2017 Mar 15.
The properties of metallic alloys can be significantly improved by developing non-equilibrium phases in the microstructures through rapid solidification techniques, thus the characterisation of these unusual structures is extremely important. In this research, the microstructures of three rapidly quenched alloys, namely Ni Nb Zr , Ni Nb Zr and Ni Nb Zr (at. %) were investigated in greater detail in order to determine the structures and compositions of their crystalline phases. These crystalline phases were characterised using a combination of scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction and transmission electron microscopy techniques. The phases were compared to the crystalline structures reported in the literature. Our results indicate some agreement with the Ni-Nb phase diagram and an isothermal section of the Ni-Nb-Zr phase diagram; however, it is detected zirconium solubility in the Ni Nb phase, as well as, the absence of expected crystalline phases.
通过快速凝固技术在微观结构中形成非平衡相，可以显著改善金属合金的性能，因此对这些特殊结构的表征极为重要。在本研究中，为了确定三种快速淬火合金（即Ni Nb Zr、Ni Nb Zr和Ni Nb Zr（原子百分比））的晶相结构和成分，对其微观结构进行了更详细的研究。使用扫描电子显微镜、能量色散X射线光谱、X射线衍射和透射电子显微镜技术相结合的方法对这些晶相进行了表征。将这些相与文献中报道的晶体结构进行了比较。我们的结果表明，与Ni-Nb相图和Ni-Nb-Zr相图的等温截面有一些一致性；然而，检测到Zr在Ni Nb相中的溶解度，以及未出现预期的晶相。
