Fe40—45Cr30—35Co20—25Mo0—4Zr0—2合金微观结构对力学性能的影响

研究了高矫顽力型FeCrCo合金力学性能和微观结构间的关系.对抗弯强度和断裂韧性的测试 结果表明，高矫顽力型FeCrCo合金的力学性能远低于普通FeCrCo合金.透射电镜照片显示高 矫顽力合金的两相成分差较大；x射线衍射结果反映高矫顽力合金衍射峰强度较弱而半高宽 较大，说明高矫顽力合金中调幅分解进行彻底.合金中α₁，α₂两 相成分差的扩 大使晶格错配度增加，强度提高，韧性降低.这就是高矫顽力合金力学性能变差的原因. 关键词： 力学性能 调幅分解 抗弯强度 断裂韧性

Effect of microstructure on the mechanical properties of Fe45-50Cr30-35Co20-25Mo0-4Zr0-2 alloy

In this paper,the relationship between the mechanical properties and the microstructure of a high-coercivity FeCrCo alloy was studied.Measurements on bending strength and fracture toughness showed that the mechanical properties of the high-coercivity FeCrCo alloy are much lower than the conventional FeCrCo alloy.TEM micrographs showed that the composition contrast between the two phases in the high-coercivity alloy is larger;XRD results indicated that the peak intensities of the high-coercivity alloy is lower and the half-peak-width is larger,which indicated that the spinodal decomposition processes are more successfully in the high-coercivity alloy.The enlargement of the composition contrast between α₁ and α₂ leads to the increase of crystal mismatch,the st rength of the alloy improved,but the ductility deteriorated,that is the reason why the mechanical properties of the high-coercivity alloy is poor.