73Ga27-xAlx)99.8Tb0.2（x=0，1，2，3，4，5）合金，研究Al添加對合金的微觀結(jié)構(gòu)、磁性能和力學(xué)性能的影響。結(jié)果顯示，合金的相結(jié)構(gòu)仍為A2相和Tb2Fe17相，其金相組織由胞狀晶和柱狀樹枝晶組織組成。合金的晶格常數(shù)降低、(100)取向性增強以及晶界處的Tb2Fe17相對磁致伸縮性能有顯著影響。合金的斷口形貌為沿晶脆性斷裂和解理斷裂，產(chǎn)生斷裂的原因包括Tb和Al元素偏析。(Fe73Ga24Al3)99.8Tb0.2合金的平行磁致伸縮應(yīng)變（λ∥）最高達(dá)到1.04×10-4。值得注意的是，相比于(Fe73Ga27)99.8Tb0.2合金，(Fe73Ga26Al1)99.8Tb0.2合金的λ∥提高了18.3%，伸長率提高了53.4%，并且(Fe73Ga26Al1)99.8Tb0.2合金兼具高飽和磁化強度（Ms）、低剩余磁化強度（Mr）和矯頑力（Hc）等特性，在實際生產(chǎn)中可以降低生產(chǎn)成本，但該合金的抗拉伸強度和維氏硬度有所下降。因此，研究Al元素添加對Fe-Ga合金的微觀機理對開發(fā)Fe-Ga合金器件具有重要意義。;(Fe73Ga27-xAlx)99.8Tb0.2 (x=0, 1, 2, 3, 4, 5) alloys were prepared by vacuum arc furnace to investigate the effect of Al addition on the microstructure, magnetic properties, and mechanical properties of alloys. Results show that the phase structure of the alloys is still A2 phase and Tb2Fe17 phase, and the metallographic structure is composed of cellular crystal and columnar dendrite. The decrease in lattice constant, the intensification of (100) orientation, and the generation of Tb2Fe17 phase at the grain boundary exert significant effect on the magnetostrictive properties. The fracture morphology of the alloys is intergranular brittle fracture and cleavage fracture, and the causes of fracture occurrence include the segregation of Tb and Al elements. The parallel magnetostrictive strain (λ∥) of (Fe73Ga24Al3)99.8Tb0.2 alloy peaks at 1.04×10-4. It is worth noting that compared with those of (Fe73Ga27)99.8Tb0.2 alloy, the λ∥ and elongation of (Fe73Ga26Al1)99.8Tb0.2 alloy increase by 18.3% and 53.4%, respectively. Besides, (Fe73Ga26Al1)99.8Tb0.2 alloy possesses the characteristics of high saturation magnetization (Ms), low remanent magnetization (Mr), and coercivity (Hc), which is beneficial to reduce the cost in actual production, but its tensile strength and Vickers hardness decrease to a certain extent. Therefore, the investigation on the micro-mechanism of Al addition on Fe-Ga alloys is of great significance for the development of Fe-Ga alloy devices."/>
73Ga27)99.8Tb0.2合金;Al摻雜;微觀結(jié)構(gòu);磁性能;力學(xué)性能;(Fe73Ga27)99.8Tb0.2 alloy;Al doping;microstructure;magnetic properties;mechanical properties"/>