Study of martensitic transformation in TiNiHfZr high temperature shape memory alloy using in situ neutron diffraction
Source abstract
Abstract
The thermoelastic martensitic transformation in the polycrystalline Ti 29.7Ni 50.3Hf 10Zr 10 alloy was studied using high-resolution and in situ neutron diffraction in the temperature range of 25–250 °C. The thermal expansion tensors of the B19′ martensite and austenite were determined. B19′ martensite is characterized by a strong anisotropy of the thermal expansion coefficients. The analysis of the diffraction peak integrated intensities suggests that nearly 10% of austenite, which is partly disordered, does not take part in martensitic transformation. The volume effect of the transformation in the Ti 29.7Ni 50.3Hf 10Zr 10 alloy was 0.79%. The simultaneous addition of Hf and Zr atoms into the TiNi matrix leads to the deterioration of the crystallographic compatibility between martensite and austenite, which may be responsible for the large thermal hysteresis and volume changes upon transformation.
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Research context
OpenAlex topics: Shape Memory Alloy Transformations · Titanium Alloys Microstructure and Properties · High-pressure geophysics and materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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