Our previous work had shown that shape memory effect (SME) of FeMnSiCrNi alloys can be remarkably improved by aligning Cr₂₃C₆ particles through introducing directional interfaces of austenite and deformation-induced martensite at room temperature before ageing. In present paper, we investigated the effects of ageing after pre-deformation at 203 K and room temperature on the precipitation of aligned Cr₂₃C₆ particles in an Fe15.3Mn5.8Si8.5Cr4Ni0.2C alloy to further improve the SME. The results showed that regardless of the deformation temperature, the SME improvement by the ageing was obviously higher after pre-deformation by 12% than 5% due to more aligned Cr₂₃C₆ particles. The ageing did not improve the SME more obviously after 12% pre-deformation at 203 K than room temperature although the number of directional interfaces between the austenite and martensite was higher. This abnormality could be rationalized by the more dislocations after pre-deformation at room temperature and concurrent comparable number and size of aligned Cr₂₃C₆ particles.

我们之前的工作表明，通过在时效前在室温下引入奥氏体和形变诱发马氏体的定向界面来排列 Cr ₂₃ C ₆颗粒，可以显着提高 FeMnSiCrNi 合金的形状记忆效应 (SME) 。在本文中，我们研究了在 203 K 和室温下预变形后时效对Fe15.3Mn5.8Si8.5Cr4Ni0.2C 合金中定向 Cr ₂₃ C _{6颗粒析出的影响，以进一步改善 SME。}结果表明，无论变形温度如何，预变形后 12% 的 SME 改善明显高于 5%，这是因为 Cr ₂₃ C _{6取向度更高。}粒子。与室温相比，在 203 K 预变形 12% 后，时效并没有更明显地改善 SME，尽管奥氏体和马氏体之间的定向界面数量更高。这种异常可以通过在室温下预变形后更多的位错和同时相当数量和尺寸的排列的Cr ₂₃ C ₆颗粒来合理化。