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Stress Generation In Ni50.3Ti29.7Hf20 Shape Memory Alloys, Utsav Shah
Stress Generation In Ni50.3Ti29.7Hf20 Shape Memory Alloys, Utsav Shah
Theses and Dissertations--Mechanical Engineering
Shape memory alloys such as NiTiHf and NiTi have the ability to generate large recovery stresses when they are constrained after pre-straining and then heated above their Austenite Finish Temperature (Af). In this work Ni49.9Ti50.1 (at.%), the most well-known SMA with impressive shape memory properties but limited temperature range and Ni50.3Ti29.7Hf20, a promising high temperature shape memory alloy, were characterized to reveal their stress generation capabilities. The effects of pre-straining on stress generation were investigated via martensite reorientation method of NiTi and NiTiHf alloys by loading the samples till …