Shape Memory Properties and Microstructure of FeNiCoAlTaB Shape Memory Alloys

The three-point-bending shape memory properties, microstructure, and magnetic properties of Fe40.95Ni28Co17Al11.5Ta2.5B0.05 (at.%) alloys were investigated. results showed a martensitic transformation in the samples that aged at 700 °C for 6 12 h under applied fields 0.05 7 Tesla. start temperature increased from −113 to −97 as aging times h. Increasing Tesla, temperatures higher temperature. Both reach saturation magnetization (140 emu/g) 98.5% cold-rolled annealed 1250 0.5 presented strong <100> texture rolling direction with an average grain size 360 μm. annealing time 1 h, intensity reduced 31.61 23.19. fraction low angle boundaries (LABs) CR after was about 24.6% 16.1%, respectively. Three-point-bending show sample displayed 0.2% recoverable strain stress level 800 MPa. Failure occurred before 900 MPa cycle could be completed. shows no 300 As levels increase 400 MPa, effect 0.8% are failures during 500 cycle. observed values lower than those theoretically predicted, which possibly due larger volume high-angle boundary slightly expected size.