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利用悬浮熔炼技术,合成了Zr0.5La0.5Ni1.5Fe0.5储氢合金,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDX)分析了热处理前后合金的显微组织。结果表明,Zr0.5La0.5Ni1.5Fe0.5热处理前主要由Zr Ni2、La Ni和少量Zr7Ni10相组成,而热处理后主要由Zr Ni2相和La Ni相组成。在凝固过程中首先从熔液中析出熔点最高Zr7Ni10相,然后析出熔点较高的C15型Laves相Zr Ni2,最后析出熔点较低的La Ni相,由于凝固速度较快,导致成分分配不均匀。热处理后,Zr Ni2相中的La元素减少,La Ni相中La和Ni的含量略有增加,Zr Ni2相晶间的杂相Zr7Ni10消失,合金成分分布更加均匀。
The Zr0.5La0.5Ni1.5Fe0.5 hydrogen storage alloy was synthesized by suspension melting technique. The microstructure of the alloy before and after heat treatment was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDX) organization. The results show that Zr0.5La0.5Ni1.5Fe0.5 mainly consists of ZrNi2, LaNi and a small amount of Zr7Ni10 phase before heat treatment, but mainly consists of ZrNi2 phase and LaNi phase after heat treatment. In the process of solidification, firstly the highest melting point Zr7Ni10 phase is precipitated from the melt, and then the higher melting point C15-type Laves phase ZrNi2 is precipitated. Finally, the LaNi phase with lower melting point is precipitated. As the solidification speed is faster, the composition distribution is not uniform. After heat treatment, the content of La and Ni in the Zr Ni2 phase decreases, the content of La and Ni in the Ni-Ni phase increases slightly, and the heterogeneous Zr7Ni10 disappears between the Zr and Ni2 phases, and the distribution of the alloy components becomes more uniform.