Finely Tunable Thermal Expansion of NiTi by Stress-Induced Martensitic Transformation and Thermomechanical Training

TL;DR

This paper presents a method to finely tune the thermal expansion of NiTi alloys through stress-induced martensitic transformation and thermomechanical training, achieving near-zero in-plane CTE with insights from simulations and theory.

Contribution

The study introduces a novel training approach to control NiTi's thermal expansion, surpassing traditional materials like Invar in stability and tunability.

Findings

Achieved near-zero in-plane CTE in NiTi alloys.

Guided the design process with atomistic simulations and theoretical models.

Provided pathways for further precise CTE adjustments.

Abstract

Tailoring the thermal expansion of martensitic materials by crystallographic texture and anisotropic variation of lattice parameters is a promising route to a flexible design of thermally stable systems. NiTi alloys are prototype materials in this respect, with shape-memory and superelastic properties owing to their thermoelastic martensitic transformations. Here, we propose a method to realize finely tunable coefficients of thermal expansion (CTE) for the NiTi alloy based upon a special combination of mechanical and thermal training. We achieve a near-zero in-plane CTE that is smaller in value than that of the FeNi-based Invar alloy. Atomistic simulations and theoretical calculations guide the method design and clarify the underlying mechanisms of the relationship between the processing conditions, the microstructural evolution, and the thermal expansion behavior. The directions for further, finer adjustments of the CTE without constraints on the shape of the materials are indicated.