本文研究了不同硼含量对Ｆｅ－２８Ａｌ－１．９４Ｃｒ合金组织结构和室温、高温力学性能的影响．加入０．０３８ａｔ．－％Ｂ后，有细小的（Ｆｅ，Ｃｒ）_２Ｂ相析出，随着硼含量增加，析出相增多增大，加入１．１８ａｔ．－％Ｂ后，析出相变成网络状．０．０３８－０．２２ａｔ．－％Ｂ可明显改善合金的塑性和强度，０．０３８ａｔ．－％Ｂ使合金压缩屈服强度由５３２ＭＰａ提高到６７８ＭＰａ，塑性由１５％提高到２５％，过量的硼不但降低了合金的塑性，也使强度明显下降．６００℃时，较低的硼含量对塑性有利，而较高的硼含量则可以提高高温强度．
Effect of B addition on the microstructure and mechanical properties of Fe-28Al-1. 94Cr alloy was investigated. In the alloy containing 0.038at.-%B, some fine (Fe, Cr)_2 B particles were found to precipitate, and these were tending in quantity and size as B content increasing. When B was up to 1. 18 at.-%, (Fe, Cr)_2 B precipitated in the form of network. Addition of B ranged 0.038 to 0.22at.-% into Fe_3Al alloy may remarkably improve the room temperature ductility and strength. The alloy containing 0.038at.-%B makes the increase of its compressive yield strength from 532 to 678 MPa, and its ductility from 15 to 25%. If the alloy is in excess of B, saying 1.18at.-%, not only reduction of ductility but also decrease of strength will be obvious. Less B in the alloy may be beneficial to its ductility at elevated temperature up to 600℃, while more B may improve its high temperature strength. Correspondent:GUO Jianting, professor,（Institute of Metal Research, Chinese Academy of Sciences, Shenyang110015）
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