Phase equilibria and diffusion in the Be-Al-Fe
Phase equilibria and diffusion in the Be-Al-Fe
复制标题
Be-Al-Fe 中的相平衡和扩散
DOI：
10.1007/bf02644075
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
J. Smugeresky
中科院分区：
文献类型：
--
作者：
S. Myers;J. Smugeresky
采用高能离子束的新方法研究了Be-Al-Fe体系中包围α-Be区的相界。通过离子注入铝和/或铁到单晶铍中，在样品的第一个≃0.1 μm处形成理想的第二相。在继续等温退火下，第二相溶入基体α-Be，并通过离子后向散射对这一过程进行了无损监测。分析给出了所考虑的物质的固体溶解度和扩散系数。测定铁在铍中的溶解度在773 (170 appm) ~ 1123 （1600 appm）之间；在973以上，目前的数据与以前文献的结果顺利合并。在873 K时，铝在Al-Be共晶以下的溶解度有一个新的上限：≤70 appm。在三元体系中，首次测定了铁在过量铝存在下的溶解度；低于1123则为> 100 appm。
Phase boundaries enclosing the α-Be region of the Be-Al-Fe system have been investigated by a new approach which utilizes high-energy ion beams. Ion implantation of aluminum and/or iron into single-crystal beryllium was used to create a desired second phase in the first ≃0.1 μm of the sample. Under continued isothermal annealing the second phase dissolved into the underlying bulk α-Be, and this process was monitored nondestructively by ion backscattering. Analysis then gave the solid solubility and the diffusivity of the species under consideration. The solubility of iron in beryllium was measured between 773 (170 appm) and 1123 (1600 appm); above 973 the present data merge smoothly into previous results from the literature. A new upper bound was established for the solubility of aluminum below the Al-Be eutectic: ≲ 70 appm at 873 K. In the ternary regime, the solubility of iron in the presence of excess aluminum was measured for the first time; below 1123 it is ≲ 100 appm.