Executive Summary : | A low temperature shape memory alloy is one in which the transformation temperatures are below the room temperature. The recovery temperature determines the use of a shape memory alloy. Even though binary equiatomic Ni-Ti shape memory alloys offer appealing shape memory features, their usage is restricted to transformation temperatures. They are utilised in room-temperature equipment such as domestic appliances (flexible antennas, rice cookers, water temperature control systems), medical devices (orthodontic archwires, stents, catheters), transportation devices (bullet train valve regulators), etc. Most Ni-Ti alloys activate between 40 and 60 C. Low-temperature applications are not preferable for such applications. The current recovery temperature for industrial shape memory alloys is 100°C (maximum). Martensitic transition is reversible at these temperatures. Low-temperature sMAs are therefore needed. shape memory alloys are often employed as thin wires and sheets. In this scenario, the workability of the alloys is vital for shaping and sizing them. stability of functional qualities under stress and at lower temperatures is particularly significant for practical applications. Current shape memory alloys already have plenty of difficulties and are not suitable for industrial use. These are to be overcome if they are to be used in the identified applications. This proposal is put forth with a view to taking up work to address the problems and develop alloys for cryogenic applications. It is proposed to explore the effect of ternary/quaternary (NiTiCo, NiTiV, CuAlMn) additions and thermomechanical treatment on the recovery temperature and workability and stability of the alloys. |