Abstract
The microstructure and martensitic transformation behavior of Ni50−xTi50Lax (x = 0.1, 0.3, 0.5, 0.7) shape memory alloys were investigated experimentally. Results show that the microstructure of Ni50−xTi50Lax alloys consists of a near-equiatomic TiNi matrix, LaNi precipitates, and Ti2Ni precipitates. With increasing La content, the amounts of LaNi and Ti2Ni precipitates demonstrate an increasing tendency. The martensitic transformation start temperature increases gradually with increasing La content. The Ni content is mainly responsible for the change in martensite transformation behavior in Ni50−xTi50Lax alloys.
Highlights
The unique shape memory effect and super elasticity of Ti–Ni alloys are related to martensitic transformation, which usually stems from the transformation of the B2 austenite parent phase into theB19’ martensite phase [1,2]
The normalized pixel amounts of bright and dark precipitates exhibit an increasing tendency, which indicates that the size and quantity of bright and black precipitates increase with increasing La content in Ni50−x Ti50 Lax alloys
Alloys were investigated by X-ray diffraction (XRD), SEM, and DSC
Summary
The unique shape memory effect and super elasticity of Ti–Ni alloys are related to martensitic transformation, which usually stems from the transformation of the B2 austenite parent phase into theB19’ martensite phase [1,2]. The martensitic transformation temperature is an important parameter that significantly affects the applications of Ti–Ni alloys. Some application fields, such as automotive and aerospace, require high martensitic transformation temperatures [3]. Experimental research suggests that adding a third element to Ti–Ni alloys is an effective approach to increase the martensitic transformation temperature [4]. Addition of Pd to Ti–Ni alloys can significantly increase the martensitic transformation temperature [5].Variations in Pd content enable adjustment of the martensitic transformation temperature of Ti–Ni–Pd alloys to the range of 100–530 ◦ C, making. Besides Pd, addition of Au [6], Pt [7], or Hf [8] to Ti–Ni alloys can effectively increase the martensitic transformation temperature
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