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Martensitic phase transformation in TiNi.
Scientific Reports
|September 20, 2019
Summary
Temperature-dependent perturbed angular correlation (PAC) measurements reveal martensitic phase transformations in TiNi alloys. Three distinct TiNi phases, including austenite and martensite, were identified across a wide temperature range.
Area of Science:
- Materials Science
- Condensed Matter Physics
Background:
- Equiatomic TiNi intermetallic alloys exhibit complex phase behavior.
- Understanding phase transformations is crucial for TiNi alloy applications.
Purpose of the Study:
- To investigate the martensitic phase transformations in TiNi alloys using temperature-dependent perturbed angular correlation (PAC) spectroscopy.
- To identify and characterize the different phases present in TiNi across a range of temperatures.
Main Methods:
- Perturbed angular correlation (PAC) measurements were performed on equiatomic TiNi alloys from 77 K to 873 K.
- X-ray diffraction (XRD) measurements were conducted at room temperature to corroborate PAC findings.
Main Results:
- Three distinct frequency components, corresponding to cubic austenite, monoclinic martensitic, and intermediate orthorhombic phases of TiNi, were observed between 298 K and 873 K.
- The monoclinic martensitic phase was predominant at room temperature (52%), while the cubic austenite phase increased with temperature.
- At 77 K, only the martensitic phase was detected, indicating the absence of intermediate and austenite phases.
Conclusions:
- The study successfully identified and characterized three phases in TiNi alloys using PAC spectroscopy.
- The observed phase transformations are consistent with temperature-dependent structural changes in TiNi.
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