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Martensitic phase transformation in TiNi.

R Sewak^1,2, C C Dey^3,4

¹Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata, 700064, India.

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.

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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.