The present study reports on the feasibility of using Fe-Mn-Al-Ni shape memory alloys as prestressing elements in civil engineering. Polycrystalline Fe-Mn-Al-Ni specimens were prestrained and subsequently heated up under constant strain in order to evaluate the prestressing potential of the material. Due to the formation of precipitates as a function of both, maximum heating temperature and dwell time, the prestress level of the material can be tailored. Moreover, in oligocrystalline specimens prestress losses, e.g., due to shrinkage and creep of concrete, can be impeded by changing the functional properties from shape memory effect to superelasticity. Based on the results presented it can be concluded that the Fe-Mn-Al-Ni system is a promising alternative to conventional shape memory alloys used for prestressing applications eventually enabling novel and innovative applications in numerous civil engineering structures by utilizing the well-defined evolution of precipitates during activation.

本研究报告了在土木工程中使用Fe-Mn-Al-Ni形状记忆合金作为预应力元素的可行性。对多晶Fe-Mn-Al-Ni试样进行预应变，然后在恒定应变下加热，以评估材料的预应力潜力。由于析出物的形成是最大加热温度和停留时间的函数，因此可以调整材料的预应力水平。此外，在寡晶试样中，例如，由于混凝土的收缩和蠕变引起的预应力损失，可以通过将功能特性从形状记忆效应更改为超弹性来阻止。