Abstract
Fe-Mn-Si-Cr based shape memory alloys (SMAs) have desirable formability, moderate shape memory effect (SME) and low cost. This makes ferrous SMAs highly potential in large-scaled applications such as pipe coupling, rail fish plates, and other smart construction methods. Also, Fe-Mn-Si-Cr alloys only have one-way shape memory effect, which is ideal for applications that require only-one-time shape recovery as the fixed structure shape. In this study, the shape memory effect of Fe-30Mn-6Si-5Cr (in wt%) SMAs are improved by adding 0.1 wt% and 1.0 wt% Ta along with ageing treatment from 500 to 800℃ for 2 hours. 1.0 weight percent Ta addition followed by ageing at 700℃ for 2 hours increases recovery ratio up to 16 percent. Precipitate particles such as TaC and χ were found in the aged samples with different size and distribution in the γ matrix. Mechanisms of improving SME by Ta addition are proposed in the work: Solid solution and precipitation strengthening on the γ matrix, grain refining of γ parent phase, domain effect of precipitate particles, and increasing of stacking fault probability.
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