The influence of cold work processing and aging on the elastocaloric effect in Ni rich Ni-Ti alloy

In recent years, shape memory alloys have attracted a lot of attention and extensive research due to theirremarkable performance properties, including the shape memory effect (SME) and the superelasticityeffect (SE). We homogenized Ni۵۰.۸Ti۴۹.۲ ingot to achieve optimal microstructural homogeneity andminimal precipitation, then cold rolled and aged a portion of the ingot to enhance superelasticity. Inorder to evaluate the martensite transformation of Ni۵۰.۸Ti۴۹.۲ alloy under homogenized and cold-rolledagedconditions, load-unload tests were conducted. As a result of thermomechanical treatment,pseudoelastic properties were improved. The amount of temperature changes resulting from themartensitic transformation, which expresses the elastocaloric effect, was found to be ۱۵.۲℃.

کلیدواژه ها:

NiTi ، Thermomechanical treatment ، Pseudoelastic effect ، Elastocaloric effect