Abstract: This study investigates the phase transition temperature and restoration force characteristics of shape memory alloy gaskets to address issues such as increased contact resistance and loosening connections in parallel grooved clamps of electrified railways caused by thermal generation during operation. The phase transition temperature range of the gaskets was determined using Differential Scanning Calorimetry (DSC), while a universal testing machine and temperature-controlled chamber were employed to systematically evaluate the restoration force variations of M16 shape memory alloy gaskets during heating and cooling processes. Additionally, a high-current generator and infrared thermography were utilized to simulate and measure temperature rise data of the shape memory alloy gaskets and spring washers under high-current conditions.Experimental results demonstrate that the completion temperature of the Austenite phase transition (Af) for the shape memory alloy gaskets is 43.34 ℃. Restoration force testing revealed that the gasket's restoration force significantly increases with rising temperature, with the pronounced growth range closely aligning with the phase transition interval. Furthermore, the gaskets retain a high residual restoration force even during the cooling phase. Temperature rise tests indicate that when the clamp temperature reaches approximately 70 ℃, the gasket generates a restoration force, enhancing the clamping force, reducing contact resistance, and initiating a temperature decline. The application of shape memory alloy gaskets effectively mitigates heat generation caused by clamp loosening, thereby improving operational safety.