Shape memory alloys (SMAs) with high transformation temperatures can enable simplifications and improvements in operating efficiency of many mechanical components designed to operate at tem...

High temperature shape memory alloys

Several alloy systems can be selected for high-temperature shape memory alloys (HTSMA) with stable transformation temperatures above 390 K. However, due to the lack of minimum quality standards for stability, ductility, functional behavior and reliability, no successful application have been realized so far. This paper will cover some recent developments in design of the novel Zr–Cu-based HTSMA system through the comparison with Ti–Ni–Zr and Ti–Ni–Hf alloys. Important peculiarities in shape memory behaviour of HTSMA systems mentioned above will be emphasized. Chemical homogeneity for HTSMA systems under study as well as their martensitic transformation temperatures stability and oxidation resistance will be compared also. Finally, a comparison of the weak and strong parts of Zr–Cu-based, Ti–Ni–Zr and Ti–Ni–Hf HTSMA systems will be pointed out.

High-temperature shape memory alloys: Some recent developments

Effects of nanoprecipitation on the shape memory and material properties of an Ni-rich NiTiHf high temperature shape memory alloy

TEM study of structural and microstructural characteristics of a precipitate phase in Ni-rich Ni–Ti–Hf and Ni–Ti–Zr shape memory alloys

NiTiHf-based shape memory alloys have been receiving considerable attention for high temperature, high strength and two-way shape memory applications since they could have transformation temperatures above 100°C, shape memory effect under high stress (above 500 MPa) and superelasticity above 100°C. Moreover, their shape memory properties can be tailored by microstructural engineering. However, NiTiHf-based alloys have some drawbacks such as low ductility and high slope in stress induced martensite transformation region. In order to overcome these limitations, studies have been focused on microstructural engineering by aging, alloying and processing. It has been revealed that microstructural control is crucial to govern the shape memory properties (e.g. transformation temperatures, matrix strength, shape recovery strain, twinning type, etc.) of NiTiHf-based alloys. A summary of the most recent improvements on selected NiTiHf-based systems is presented to point out their significant shape memory pro...

NiTiHf-based shape memory alloys

http://lbmd.coe.pku.edu.cn/pdf/2000sm-tinihf.pdf

Effect of aging on the phase transformation and mechanical behavior of Ti36Ni49Hf15 high temperature shape memory alloy

Shape memory properties of the Ti36Ni49Hf15 high temperature shape memory alloy

The energy storage density of ferroelectric thin film capacitors is mainly limited by the breakdown strength Here we demonstrate that the high breakdown strength and high energy storage density can be achieved by constructing BiFeO3/Al2O3 ferroelectricity-insulators heterojunction The breakdown strength, leakage current density and energy storage performance are investigated systematically of the multilayer thin films The relatively high breakdown strength is achieved in the Al2O3/BiFeO3/Al2O3/BiFeO3 thin film, which is benefited from the amorphous structure, built-in electric field and boundary conditions of electromagnetic field At the same time, the excellent energy storage density of the thin film is obtained mainly due to the effect of high breakdown strength The proposed structure of this work provides an useful method to improve the energy storage density of thin film capacitors

Enhanced energy storage properties of amorphous BiFeO3/Al2O3 multilayers

In this work, a significant visible-light photovoltaic effect is obtained under the influence of a built-in electric field in BiFeO3 thin films. The photocurrent density, open-circuit voltage, and ...

Photovoltaic Effect Induced by Self-Polarization in BiFeO3 Films

Photovoltaic effect in paraelectric BiVO4 film

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