退火及置换元素对Fe-Cr-Al基合金阻尼性能及强度的影响

制备了Fe-13Cr-6Al（原子分数,%）及用2%的Mo、Mn和Nb分别置换Fe-13Cr-6Al中的Cr,用0.5%和1%的Cu分别置换Fe-13Cr-6Al中的Al共6种合金.测试了各合金的阻尼性能和强度,通过金相观察和内应力分析研究了退火温度、冷却方式及合金元素对这两种性能的影响.结果表明：随着退火温度的升高,Fe-Cr-Al基阻尼合金阻尼性能升高,强度降低;随炉缓冷合金的阻尼性能高于水淬合金的阻尼性能,而前者的强度低于后者;0.5%Cu置换Al降低了位错与溶质原子之间的交互作用,但是提高了合金原子与基体原子的弹性交互作用,使合金的阻尼性能和强度都得到了提高.

INFLUENCE OF ANNEALING AND SUBSTITUTION ELEMENTS ON DAMPING CAPACITY AND STRENGTH OF Fe-Cr-Al BASED ALLOYS

The damping capacities and strengths of six alloys, Fe-13Cr-6Al, Fe-11Cr-2 (Mo, Mn or Nb)-6Al, Fe-13Cr-5.5Al-0.5Cu, and Fe-13Cr-5Al-1Cu (atomic fraction, %) were measured. The effects of annealing temperature, cooling method and substitution elements on the above two properties were discussed by optical microscope observation and internal stresses analysis. The following results were obtained: (1) The damping capacity of Fe-13Cr-6Al based alloys increases with increasing annealing temperature while strength decreases. (2) The damping capacity of furnace cooling alloys is higher than water quenched alloys while the strength of the former is lower than the latter. (3) The substitution of 0.5%Cu decreases the interaction between dislocations and solute atoms while increases the elastic interaction between alloying atoms and base atoms, which improves both damping capacity and strength of the alloy.