The influence of different heat preservation temperatures on the interaction in the Pr–Fe–As ternary system and the principle for generating the interaction products of the Pr–Fe–As ternary system were studied by metallographic microscopy, scanning electron microscopy, and x-ray diffraction. Results showed that the α-Fe with As (i.e., the compound formed when the solubility of As in Fe exceeds the maximum solubility), Fe₂As, PrAs, and a small amount of Fe₁₇Pr₂ were the main products when the atomic ratio of Pr: As is 1:3 and heat preservation for 20 h at 1173 K, 1223 K and 1273 K. PrAs decreased as the temperature increased, while the α-Fe with As decreased as the temperature decreased, and Fe₂As increased gradually as α-Fe with As decreased. In the Pr–Fe–As ternary system, the diffusion of Pr is mainly short-range diffusion and double vacancies, and the PrAs develops in the margin of the penetration region, preventing the diffusion of As in Fe.

通过金相显微镜、扫描电镜和X射线研究不同保温温度对Pr-Fe-As三元体系相互作用的影响及Pr-Fe-As三元体系相互作用产物的产生原理衍射。结果表明，α -Fe与As（即As在Fe中的溶解度超过最大溶解度时形成的化合物）、Fe ₂ As、PrAs和少量Fe ₁₇ Pr ₂是原子反应时的主要产物。 Pr:As的比例为1:3，在1173 K、1223 K和1273 K保温20 h。PrAs随温度升高而降低，而与As的α -Fe随温度降低而降低，Fe ₂随着α -Fe随着As逐渐减少而增加。在Pr-Fe-As三元体系中，Pr的扩散主要是短程扩散和双空位，PrAs在渗透区边缘发育，阻止了As在Fe中的扩散。