Effect of cerium addition on the microstructure and shape memory properties of austenitic Fe‐Mn‐Si‐Cr‐Ni alloys
Rodrigo da Silva, Luis Felipe Sverzut Baroni, Claudio Bessera Martins Junior, Danielle Cristina Camilo Magalhães, Guilherme Santos Vacchi, Andrea Madeira Kliauga, Nelson Batista Lima, Jorge Otubo, Carlos Alberto Della Rovere- Condensed Matter Physics
- General Materials Science
The addition of rare earth elements, such as cerium, to austenitic Fe‐Mn‐Si‐based shape memory alloys has been shown to improve both corrosion resistance and shape recovery. However, the mechanisms underlying the effect of Ce on shape recovery are still unclear. This study investigated the influence of the addition of small amounts of Ce (0.18, 0.42 and 0.96 wt.%) on the microstructure and shape recovery of an austenitic Fe‐13.50Mn‐3.98Si‐9.54Cr‐4.51Ni alloy. Ce additions induced the formation of a large number of Ce‐rich particles, which acted as austenitic grain refiners. Both grain refinement and the formation of Ce‐rich particles contributed to the strengthening of the matrix at 0.42 wt.% Ce addition. In addition, Ce additions altered the MS temperature, which increased with Ce additions. Total shape recovery improved with 0.18 and 0.42 wt.% Ce additions, but decreased with 0.96 wt.% Ce addition. The beneficial effect of Ce addition in improving the shape recovery of the austenitic Fe‐Mn‐Si‐Cr‐Ni alloy was related to the enhancement of the elastic shape recovery component of the total shape recovery. However, the shape memory recovery due to the shape memory effect always decreased with the increase of the Ce content.
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